Trusted Concentric Butterfly Valve Manufacturer
NTVAL provides durable Concentric Butterfly Valves made from corrosion-resistant materials for reliable performance in tough environments. With customizable options and expert support, our valves offer long-lasting operation and exceptional value for your projects.
Reliable Concentric Butterfly Valve
A concentric butterfly valve is a flow control device that uses a rotating disk to regulate the flow of liquids or gases in a system. The disk stays in the flow path but is thin enough to offer minimal resistance to the flow, making it efficient and cost-effective.
Butterfly valves, including the concentric type, have several advantages over other valve types. They have an economical design with fewer components, making them easy to operate and maintain. The lightweight wafer-style body also helps reduce costs for installation, equipment, pipe support, labor, and setup time.
The concentric butterfly valve, also known as a centric or resilient-seated valve, is the most common arrangement. In this valve, the stem is aligned along the centerline of the disk, which sits in the middle of the pipe bore. The seat is located on the inside diameter of the valve body, and there is no offset in this design. The valve relies on the flexibility of the rubber seat to create a tight seal when closed. As the disk rotates, it contacts the seat at about 85° in a full 90° turn.
Concentric butterfly valves are typically used in low-pressure applications due to their simple and effective sealing design.
Controle de qualidade
The PMI test confirms the material used in the concentric butterfly valve matches the design requirements, providing consistency and safety.
Teste PMI
The sealing test checks how well the valve closes, making sure it prevents leaks and works effectively under pressure.
Teste de vedação
The low emission test measures any possible leakage from the valve, helping reduce the release of harmful gases or fluids.
Teste de baixa emissão
The impact test examines the valve’s toughness by testing how well it can handle sudden force without breaking or bending.
Teste de impacto
The dimension inspection checks the size of each part, making sure the valve components fit together properly for smooth operation.
Inspeção de dimensões
The painting thickness test ensures the coating on the valve is thick enough to protect it from rust and environmental damage.
Teste de espessura da pintura
PT, or penetrant testing, looks for any small cracks on the valve’s surface, helping to detect and fix potential weaknesses.
PT
The material inspection checks the raw materials to confirm they can withstand pressure, temperature, and environmental conditions for safe use.
Inspeção de materiais
Nossas aplicações de válvulas nos principais setores
Descubra como nossas soluções avançadas de válvulas melhoram o controle de fluxo, proporcionando maior eficiência, segurança e garantia de qualidade rigorosa.
Concentric butterfly valves handle corrosive chemicals effectively, offering reliable flow control and resistance to the harsh environments found in chemical processing.
Processamento químico
In the petrochemical industry, concentric butterfly valves regulate the flow of oil, gas, and other fluids under high-pressure and high-temperature conditions.
Química da gasolina
Concentric butterfly valves withstand the extreme pressures and temperatures in nuclear and power generation systems, providing safety and durability.
O.P.G. e Nuclear
The pulp industry benefits from concentric butterfly valves because they easily manage thick liquids like slurry, for smooth flow and control.
Polpa
In mining operations, concentric butterfly valves control abrasive materials effectively, maintaining performance in the rough and dusty conditions of mining environments.
Mineração
Concentric butterfly valves are ideal for water and sewage systems, offering reliable and simple operation while handling large volumes of liquid.
Água e esgoto
Concentric butterfly valves control steam flow efficiently, helping manage pressure and temperature in large-scale steam distribution networks.
Sistema de vapor
In boiling systems, concentric butterfly valves regulate the flow of steam and hot water, contributing to consistent and safe heat management.
Sistema de ebulição
Obtenha uma válvula mais versátil
How Does a Concentric Butterfly Valve Work?
Concentric butterfly valves have a simple design made up of four key parts: the body, seal, disc, and stem. The disc is located in the center of the valve and is connected to the stem, which is attached to an actuator or handle outside the valve. Below is an overview of how the valve functions in both open and closed positions to control fluid flow:
- Closed Position: When the valve is closed, the disc is positioned perpendicular to the flow, blocking it completely. The valve seat is shut, and the stem is sealed with an O-ring to prevent leakage.
- Opening the Valve: When the handle or actuator rotates the stem by 90 degrees, the disc moves away from the valve seat and becomes parallel to the flow, allowing fluid or gas to pass through.
- Throttling: If the valve is rotated to an angle less than 90 degrees, it partially opens, allowing the flow to be throttled or controlled. This enables the valve to regulate flow rates as needed.
This design is effective for simple flow control and is commonly used in low-pressure applications.
Classification by Connection Type
Concentric butterfly valves can be classified into different types based on the connection method:
Wafer Type
The wafer-type butterfly valve is designed to provide a tight seal and protect against bi-directional pressure differences, preventing backflow in systems designed for one-way flow. This is achieved using a tightly fitted cap like an O-ring or gasket, along with a precisely machined and smooth valve face on both the upstream and downstream sides of the valve.
Lug Type
The lug-type butterfly valve operates similarly to a 3-piece ball valve. One side of the pipeline can be removed for maintenance without affecting the other side. This is done using threaded inserts, flanges, and two sets of lugs (bolts) that secure the valve without the need for nuts. It allows maintenance, cleaning, or replacement without shutting down the entire system.
Flanged End Type
The flanged-end butterfly valve features flanges at both ends, which are used to connect to pipe flanges. This type of connection is typically used for larger butterfly valves due to its strength and stability in larger pipeline systems.
Welded End Type
The welded-end butterfly valve is used in high-pressure systems. The ends of the valve are welded directly to the pipeline, providing a robust connection. This type is generally used for smaller-sized butterfly valves where high-pressure conditions are present.
When to Use a Concentric Butterfly Valve?
Concentric butterfly valves are ideal for applications that involve lower pressure and temperatures, typically up to 200 psi and 400°F. They use soft sealing materials, making them suitable for handling basic liquids like water, as well as certain chemicals, abrasive liquids, and gases. Common uses include:
- Tratamento de água
- Water Distribution
- Water Transmission
- Aeration Systems
- Sistemas de proteção contra incêndios
Concentric Butterfly Valve vs Eccentric Butterfly Valve
Here’s a table to help better understand the differences between concentric and eccentric butterfly valves:
| Recurso | Válvula borboleta concêntrica | Eccentric Butterfly Valve |
| Design de disco | Simple disc design | More complex disc with seals, seal-holding rings, and bolts |
| Sealing Construction | Disc directly contacts rubber seat for sealing | Laminated disc seal touches a metal seat |
| Seal Material | Soft seal (rubber) | Metal seat (fitted or welded, often replaceable) |
| Pressure Handling | Limited to 150LB/PN25 | Can handle higher pressures, up to 600LB/PN100 |
| Temperature Resistance | Cannot handle high temperatures due to rubber seat | Suitable for high-temperature applications with metal/hard seals |
Design
Flanged End Type
Monoflange Wafer Butterfly Valve
Recursos e benefícios
| Recurso | Benefício |
Seat-in-body design. Seat molded in recessed body cavity, protected by metal on 3 sides | Reduces seat failure due to corrosive buildup in the valve and pipeline. No hardware to loosen. No periodic maintenance required. Rubber protected from flow media to increase seat life. |
| Valve withstood proof-of-design testing of 100,000 cycles – AWWA only requires 10,000 cycle proof-of-design testing | Proven reliability over the life of the valve |
| Through-disc pinning | Provides a tight disc-to-shaft pin connection, greatly reducing the possibility of loosening through vibration |
| Symmetrical lens-shaped disc | Higher Cv: lower head loss results in energy savings for customer’s system |
| Nonmetallic bearings | Prevents galvanic corrosion and provides lower coefficient of friction |
| Chevron V-type packing | Self-adjusting, lasts the life of the valve |
| TAMANHO (pol.) | TAMANHO (pol.) | TAMANHO (pol.) | |||
| Cv | Cv | Cv | |||
| 3″ | 323 | 10″ | 4458 | 16″ | 11413 |
| 4″ | 575 | 12″ | 6420 | 18″ | 14444 |
| 6″ | 1294 | 14″ | 8738 | 20″ | 17832 |
| 8″ | 2300 | Cv values in the full open position | |||
Padrão Material | Corpo | Type of Material Disco | Eixo | Specifications for Materiais de construção |
Cast Ferro | Cast Ferro | Ferro fundido 316 edge | SS, Type 304 | Cast Iron: ASTM A48,Class 40(Flanged) ASTM A126,Class B(Monoflanged) |
Other materials available upon request. | Stainless Steel: ASTM A276 Type304(Shaft) | |||
Suggested Specification
General
Butterfly valves shall be manufactured in accordance with the latest revision of AWWA C504, Class 150B and conform to NSF Standard 61. All valves must meet the following specifications.
Valve Bodies
Valve bodies shall be constructed from ASTM A126, Class B cast iron for flanged valves, or ASTM A48, Class 40 for wafer-style valves. Flanged valves shall be fully faced and drilled per ANSI Standard B16.1, Class 125.
Valve Seats
Rubber body seats shall be of one-piece construction, molded and bonded into a recessed cavity within the valve body. Seats shall not be located on the disc or retained by segments or screws. For wafer-style valves, the seat must cover the entire inner surface of the valve body and extend over the valve body’s outer face to act as a flange gasket.
Valve Bearings
Valve bearings shall be made from self-lubricating, nonmetallic material to ensure that the disc-shaft assembly is isolated from the valve body. Metal-to-metal thrust bearings in the flow stream are not allowed.
Valve Disc
The disc must be a lens-shaped design to minimize pressure drops and reduce line turbulence. The disc materials shall be ASTM A126, Class B cast iron disc with a stainless steel type 316 edge. Discs must be retained by stainless steel pins, extending through the full diameter of the shaft, to withstand the specified line pressure and operating torque. Disc stops in the flow stream are not allowed.
Valve Shafts
Valve shafts shall be made of stainless steel type 304. The valve shaft operation shall utilize a packing gland with “V” type chevron packing. “O” ring and “U” cup packing are not permitted.
Painting
All valve interior surfaces must be clean, dry, and free of grease before painting. Surfaces, excluding the disc edge, rubber seat, and finished parts, must be evenly coated with asphalt varnish, conforming to Federal Specification TT-C-494 and AWWA Standard C504. The valve’s exterior surfaces and actuators must be coated with a suitable primer to match field coatings.
Testing
All valves must undergo hydrostatic and seat leakage tests according to AWWA Standard C504.
Atuadores manuais
Design
- Must be of the traveling nut, self-locking type.
- Designed to hold the valve in any position between fully open and fully closed without creeping or fluttering.
Mechanical Stops
Actuators must include mechanical stop-limiting devices to prevent overtravel of the disc in both open and closed positions.
Capacity
- Actuators must operate with a maximum pull of 80 lb. on the handwheel or chain wheel.
- Components must withstand an input of 450 ft. lbs. at extreme operator positions without damage.
Padrões
- Manual actuators must comply with AWWA C504.
Dimensional Data
Válvula borboleta flangeada
| TAMANHO (pol.) | A | B | C | D | E | F | G |
| 3 | 4-3/4 | 3-1/4 | 7-1/2 | 5 | 3/4 | 4-5/8 | 6 |
| 4 | 5-1/2 | 3-1/2 | 9 | 5 | 15/16 | 8-5/8 | 7-1/2 |
| 6 | 6-1/2 | 5-1/8 | 11 | 5 | 1 | 8-3/4 | 9-1/2 |
| 8 | 7-3/4 | 6-1/2 | 13-1/2 | 6 | 1-1/8 | 8-3/4 | 11-3/4 |
| 10 | 9 | 9-7/8 | 16 | 8 | 1-3/16 | 12-7/8 | 14-1/4 |
| 12 | 10-1/2 | 11-3/8 | 19 | 8 | 1-1/4 | 12-718 | 17 |
| 14 | 11-7/8 | 12-3/4 | 21 | 8 | 1-3/8 | 12-1 | 18-3/4 |
| 16 | 13-1/2 | 14-3/8 | 23-1/2 | 8 | 1-7/16 | 16-1 | 21-1/4 |
| 18 | 14-3/8 | 15-1/4 | 25 | 8 | 1-9/16 | 16-1-1/8 | 22-3/4 |
| 20 | 16 | 16-7/8 | 27-1/2 | 8 | 1-11/16 | 20-1-1/8 | 25 |
Válvula borboleta de wafer
| TAMANHO | DISC | MINIMUM | Tamanho | A | B | C | D | |
| (pol.) | O.D. | MATING PIPEI.D | ||||||
| 3 | 3.089 | 2.41 | 3 | 4-3/4 | 3-1/4 | 5-1/4 | 2-1/16 | |
| 4 | 4.074 | 3.44 | 4 | 5-1/2 | 3-1/2 | 6-3/4 | 2-5/16 | |
| 6 | 6.07 | 5.38 | 6 | 6-1/2 | 5-1/8 | 8-5/8 | 2-15/16 | |
| 8 | 8.078 | 7.53 | 8 | 7-3/4 | 6-1/2 | 10-7/8 | 3-1/16 | |
| 10 | 10.098 | 9.62 | 10 | 9 | 9-7/8 | 13-1/4 | 3-3/16 | |
| 12 | 12.108 | 11.64 | 12 | 10-1/2 | 11-5/16 | 16 | 3-7/16 | |
| 14 | 13.339 | 12.86 | 14 | 11-7/8 | 12-3/4 | 17-5/8 | 3-11/16 | |
| 16 | 15.336 | 14.79 | 16 | 13-1/2 | 14-3/8 | 20-1/8 | 4-3/16 | |
| 18 | 17.37 | 16.75 | 18 | 14-3/8 | 15-1/4 | 21-1/2 | 4-11/16 | |
| 20 | 19.38 | 18.71 | 20 | 16 | 16-13/16 | 23-3/4 | 5-3/16 |
Mechanical Joint End Butterfly Valve
| TAMANHO (pol.) | A | B | C | D | E | F | G | X |
| 4 | 5-1/2 | 3-1/2 | 9 | 8-1/8 | 1 | 4-3/4 | 7-1/2 | 3-1/8 |
| 6 | 6-1/2 | 5-1/8 | 11 | 8-1/2 | 1-1/16 | 6-3/4 | 9-1/2 | 3-1/2 |
| 8 | 7-3/4 | 6-1/2 | 13-1/4 | 8-5/8 | 1-1/8 | 6-3/4 | 11-3/4 | 3-5/8 |
| 10 | 9 | 9-3/4 | 15-9/16 | 9-1/4 | 1-3/16 | 8-3/4 | 14 | 4-1/4 |
| 12 | 10-1/2 | 11-3/8 | 17-15/16 | 9-1/4 | 1-1/4 | 8-3/4 | 16-1/4 | 4-1/4 |
| 14 | 11-7/8 | 12-3/4 | 20-5/16 | 11-1/2 | 1-5/16 | 10-3/4 | 18-3/4 | 4-1/2 |
| 16 | 13-1/2 | 14-5/16 | 22-9/16 | 12 | 1-3/8 | 12-3/4 | 21 | 5 |
| 18 | 14-3/8 | 15-3/8 | 24-11/16 | 12-1/4 | 1-3/8 | 12-3/4 | 23-1/4 | 5-1/4 |
| 20 | 16 | 17 | 27-3/32 | 12-1/2 | 1-1/2 | 14-3/4 | 25-1/2 | 5-1/2 |
Mechanical Joint and Flange End Butterfly Valve
| TAMANHO (pol.) | A | B | C | CC | D | DD | E | EE | F | FF | G | GG | X |
| Unit: inch | |||||||||||||
| 6 | 6-1/2 | 5-1/8 | 11 | 11 | 6-3/4 | 4-1/4 | 1-1/16 | 1-1/16 | 8-3/4 | 6-3/4 | 9-1/2 | 9-1/2 | 4-1/4 |
| 8 | 7-3/4 | 6-1/2 | 13-1/2 | 13-1/4 | 7-5/16 | 4-5/16 | 1-1/8 | 1-1/8 | 8-3/4 | 6-3/4 | 11-3/4 | 11-3/4 | 4-13/16 |
| 10 | 9 | 9-7/8 | 16 | 15-9/16 | 8-5/8 | 4-5/8 | 1-1/4 | 1-3/16 | 12-7/8 | 8-3/4 | 14-1/4 | 14-14 | 6-1/8 |
| 12 | 10-1/2 | 11-3/8 | 19 | 17-15/16 | 8-5/8 | 4-5/8 | 1-1/4 | 1-1/4 | 12-7/8 | 8-3/4 | 17 | 16-1/4 | 6-1/8 |
| 14 | 11-7/8 | 12-3/4 | 21 | 20-5/16 | 9-3/4 | 5-3/4 | 1-3/8 | 1-5/16 | 12-1 | 10-3/4 | 18-3/4 | 18-3/4 | 6-1/4 |
| 16 | 13-12 | 14-3/8 | 23-1/2 | 22-9/16 | 10 | 6 | 1-7/16 | 1-3/8 | 16-1 | 12-3/4 | 21-1/4 | 21 | 6-1/2 |
| 18 | 14-3/8 | 15-1/4 | 25 | 24-11/16 | 10-1/8 | 6-1/8 | 1-9/16 | 1-7/16 | 16-1-1/8 | 12-3/4 | 22-3/4 | 23-1/4 | 6-5/8 |
| 20 | 16 | 16-7/8 | 27-1/2 | 27-3/32 | 10-1/4 | 6-1/4 | 1-11/16 | 1-1/2 | 20-1-1/8 | 14-34 | 25 | 25-1/2 | 6-3/4 |
Note 1: Min. Pipe I.D. value has zero clearance between mating pipe and valve disc.
Properly sized piping must include appropriate clearance.
PIPE TAMANHO | PIPE 0.D. | PIPE 1.D. MIN. |
| 4 | 4.8 | 3.1 |
| 6 | 6.9 | 5.69 |
| 8 | 9.05 | 7.65 |
| 10 | 11.1 | 9.93 |
| 12 | 13.2 | 11.7 |
| 14 | 15.3 | 12.91 |
| 16 | 17.4 | 14.91 |
| 18 | 19.5 | 16.95 |
| 20 | 21.6 | 18.96 |
Push-on Joint End Butterfly Valve
- All dimensions shown in inches.
- Available in sizes 4 through16 inches.
- D +-1/16″ through 10″ valves, +-1/8″ for 12″ and larger valves.
- The valve end is designed for iron or PVC pipe with cast iron equivalent O.D.s
(not for use with IPS O.D.pipe.)
| TAMANHO (pol.) | A | B | C | D | X |
| Unidade: polegada | |||||
| 4 | 5-1/2 | 3-1/2 | 6-7/8 | 10-3/8 | 3-1/8 |
| 6 | 6-1/2 | 5-1/8 | 9 | 10-3/4 | 3-1/2 |
| 8 | 7-3/4 | 6-1/2 | 11-1/4 | 12 | 3-5/8 |
| 10 | 9 | 9-7/8 | 14 | 12-5/8 | 4-1/8 |
| 12 | 10-1/2 | 11-3/8 | 16-3/8 | 15 | 5-1/8 |
| 14 | 11-7/8 | 12-3/4 | 18-7/8 | 14-3/4 | 4-1/2 |
| 16 | 13-1/2 | 14-3/8 | 21-1/4 | 15 | 4-3/4 |
Push-on X Flange End Butterfly Valve
- All dimensions shown in inches.
- Available in sizes 4 through16 inches.
- D +-1/16″ through 10″ valves, +-1/8″ for 12″ and larger valves.
- The valve end is designed for iron or PVC pipe with cast iron equivalent O.D.s
(not for use with IPS O.D.pipe.)
| TAMANHO (pol.) | A | B | C | CC | D | E | F | G |
| Unit: inch | ||||||||
| 4 | 5-1/2 | 3-1/2 | 6-7/8 | 9 | 7-11/16 | 15/16 | 8-5/8 | 7-1/2 |
| 6 | 6-1/2 | 5-1/8 | 9 | 11 | 7-7/8 | 1 | 8-3/4 | 9-1/2 |
| 8 | 7-3/4 | 6-1/2 | 11-1/4 | 13-1/2 | 8-15/16 | 1-1/8 | 8-3/4 | 11-3/4 |
| 10 | 9 | 9-7/8 | 14 | 16 | 10-5/16 | 1-3/16 | 12-718 | 14-1/2 |
| 12 | 10-1/2 | 11-3/8 | 16-3/8 | 19 | 11-1/2 | 1-1/4 | 12-7/8 | 17 |
| 14 | 11-718 | 12-11/16 | 18-718 | 21 | 11-3/8 | 1-3/8 | 12-1 | 18-3/4 |
| 16 | 13-1/2 | 14-5/16 | 21-1/4 | 23-1/2 | 11-1/2 | 1-7/16 | 16-1 | 21-1/4 |
Victaulic End Butterfly Valve
All dimensions shown in inches.
D dimension +-1/16″ for 4″ thru 10″ valves.
D dimension +-1/8″ for 12″ thru 20″ valves.
| TAMANHO (pol.) | A | B | C | D | E |
| Unidade: polegada | |||||
| 4 | 5-1/2 | 3-1/2 | 5-5/16 | 8-1/8 | 3/4 |
| 6 | 6-1/2 | 5-1/8 | 7-1/2 | 8-1/2 | 3/4 |
| 8 | 7-3/4 | 6-1/2 | 9-3/4 | 8-5/8 | 7/8 |
| 10 | 9 | 9-7/8 | 12 | 8 | 15/16 |
| 12 | 10-1/2 | 11-5/16 | 14-1/4 | 8 | 15/16 |
| 14 | 11-718 | 12-11/16 | 16-7/16 | 8 | 15/16 |
| 16 | 13-1/2 | 14-5/16 | 18-1/2 | 8 | 1-3/16 |
| 18 | 14-3/8 | 15-3/16 | 20-15/16 | 8 | 1-1/4 |
| 20 | 16 | 16-13/16 | 22-7/8 | 8 | 1-3/16 |
Manual Actuator
| TAMANHO (pol.) | AMG Size | J | L | M | N | P |
| Unidade: polegada | ||||||
| 3to 12″ | AMG-2 | 4-11/16 | 2 | 2-1/8 | 2 | 4-1/2 |
| 14,16″ | AMG-3 | 5-5/8 | 2-7/16 | 3-1/4 | 3-5/32 | 5-5/8 |
| 18,20″ | AMG-4 | 6-3/8 | 2-27/32 | 3-3/8 | 4 | 7-5/16 |
| Q | R | S | T | V | W | #Turns to close |
| Unidade: polegada | ||||||
| 4-1/4 | 7-5/8 | 7-7/8 | 7-7/8 | 8 | 9-1/8 | 32 |
| 5-3/8 | 9-1/4 | 10-1/2 | 10 | 12 | 9-1/8 | 30 |
| 6-3/4 | 10-1/2 | 11-1/2 | 11 | 12 | 9-1/8 | 40 |
125# Flanged & Mechanical Joint Specification
Butterfly valves shall be manufactured in accordance with the latest revision of AWWA Standard C504, Class 250B and be suitable for a differential pressure of 250 psig. The valves must comply with the following specifications:
Corpo de ferro dúctil
Flanged X Mechanical Joint 6”-16”
| TAMANHO (pol.) | A | B | C | CC | D | DD | E | |
| Unidade: polegada | ||||||||
| 6 | 6-1/2 | 5-1/8 | 11 | 11 | 6-3/4 | 4-1/4 | 1-1/16 | |
| 8 | 7-3/4 | 6-1/2 | 13-1/2 | 13-1/4 | 7-5/16 | 4-5/16 | 1-1/8 | |
| 10 | 9 | 9-7/8 | 16 | 15-9/16 | 8-5/8 | 4-5/8 | 1-1/4 | |
| 12 | 10-1/2 | 11-3/8 | 19 | 17-15/16 | 8-5/8 | 4-5/8 | 1-1/4 | |
| 16 | 13-1/2 | 14-3/8 | 23-1/2 | 22-9/16 | 10 | 6 | 1-7/16 | |
| TAMANHO (pol.) | EE | F | FF | G | GG | X | Unidade: polegada | |
| 6 | 1-1/16 | 8-3/4 | 6-3/4 | 9-1/2 | 9-1/2 | 4-1/4 | ||
| 8 | 1-1/8 | 8-3/4 | 6-3/4 | 11-3/4 | 11-3/4 | 4-13/16 | ||
| 10 | 1-3/16 | 12-7/8 | 8-3/4 | 14-1/4 | 14 | 6-1/8 | ||
| 12 | 1-1/4 | 12-7/8 | 8-3/4 | 17 | 16-1/4 | 6-1/8 | ||
| 16 | 1-3/8 | 16-1 | 12-3/4 | 21-1/4 | 21 | 6-1/2 | ||
| Actuator Size | J | L | M | N | P | Q | R | Number of Turns |
| AMG-2S | 4-11/16 | 2 | 2-1/8 | 2 | 4-1/2 | 4-1/2 | 8-1/4 | 32 |
| AMG-3S | 5-5/8 | 2-7/16 | 3-1/4 | 3-5/32 | 5-5/8 | 5-3/8 | 10-3/8 | 30 |
| AMG-4S | 6-3/8 | 2-27/32 | 3-3/8 | 4 | 7-5/16 | 6-3/4 | 11-5/16 | 40 |
ANSI 125# Flanged Ends 3”-20”
| TAMANHO (pol.) | A | B | C | D | E | F | G |
| Unidade: polegada | |||||||
| 3 | 4-3/4 | 3-3/4 | 7-1/2 | 5 | 3/4 | 4-5/8 | 6 |
| 4 | 5-1/2 | 4-1/2 | 9 | 5 | 15/16 | 8-5/8 | 7-1/2 |
| 6 | 6-1/2 | 5-1/2 | 11 | 5 | 1 | 8-3/4 | 9-1/2 |
| 8 | 7-3/4 | 6-3/4 | 13-1/2 | 6 | 1-1/8 | 8-3/4 | 11-3/4 |
| 10 | 9 | 9-11/16 | 16 | 8 | 1-3/16 | 12-7/8 | 14-1/4 |
| 12 | 10-1/2 | 11-3/16 | 19 | 8 | 1-1/4 | 12-718 | 17 |
| 14 | 11-7/8 | 12-9/16 | 21 | 8 | 1-3/8 | 12-1 | 18-3/4 |
| 16 | 13-1/2 | 14-3/16 | 23-1/2 | 8 | 1-7/16 | 16-1 | 21-1/4 |
| 18 | 14-3/8 | 15-1/16 | 25 | 8 | 1-9/16 | 16-1-1/8 | 22-3/4 |
| 20 | 16 | 16-11/16 | 27-1/2 | 8 | 1-11/16 | 20-1-1/8 | 25 |
| Actuator Size | Value Size | J | L | M | N | P | Q | R | Number of Turns |
| Unit: inch | |||||||||
| AMG-2S | 3-8″ | 4-11/16 | 2 | 2-1/8 | 2 | 4-1/2 | 4-1/4 | 8-1/4 | 32 |
| AMG-3S | 10-14″ | 5-5/8 | 2-7/16 | 3-1/4 | 3-5/32 | 5-5/8 | 5-3/8 | 10-3/8 | 30 |
| AMG-4S | 16&18″ | 6-3/8 | 2-27/32 | 3-3/8 | 4 | 7-5/16 | 6-3/4 | 11-5/16 | 40 |
| AMG-5 | 20″ | 7-9/16 | 3-15/32 | 4-1/2 | 5-1/2 | 8-3/4 | 10 | 17 | 44 |
ANSI 125# Flanged Ends 24”-48”
| TAMANHO (pol.) | A | B | C | D | E | F | G |
| Unidade: polegada | |||||||
| 24 | 18-5/8 | 18-3/8 | 32 | 8 | 1-7/8 | 20/1-1/4 | 29-1/2 |
| 30 | 21-1/2 | 24-1/8 | 38-3/4 | 12 | 2-1/8 | 28/1-1/4 | 36 |
| 36 | 25-7/16 | 28 | 46 | 12 | 2-3/8 | 32/1-1/2 | 42-3/4 |
| 42 | 29-7/8 | 32-11/16 | 53 | 12 | 2-5/8 | 36/1-1/2 | 49-1/2 |
| 48 | 34-1/16 | 36-7/8 | 59-1/2 | 15 | 2-3/4 | 44/1-1/2 | 56 |
| Actuator Size | J | L | M | N | P | Q | R | Number of Turns |
| Unidade: polegada | ||||||||
| AMG-5 | 7-9/16 | 3-15/32 | 4-1/2 | 5-1/2 | 8-3/4 | 10 | 17 | 44 |
| AMG-5S | 8-5/16 | 3-15/16 | 5-1/2 | 7 | 10-1/2 | 15-15/16 | 19-718 | 136 |
| AMG-6S | 9-7/8 | 5-1/16 | 7 | 8-1/4 | 12-5/8 | 14-3/16 | 16-1/2 | 215 |
Mechanical Joint 4"-20"
| TAMANHO (pol.) | A | B | C | D | E | F | G | X |
| Unidade: polegada | ||||||||
| 4 | 5-1/2 | 3-1/2 | 9 | 8-1/8 | 1 | 4-3/4 | 7-1/2 | 3-1/8 |
| 6 | 6-1/2 | 5-1/8 | 11 | 8-1/2 | 1-1/16 | 6-3/4 | 9-1/2 | 3-1/2 |
| 8 | 7-3/4 | 6-1/2 | 13-1/4 | 8-5/8 | 1-1/8 | 6-3/4 | 11-3/4 | 3-5/8 |
| 10 | 9 | 9-3/4 | 15-9/16 | 9-1/4 | 1-3/16 | 8-3/4 | 14 | 4-1/4 |
| 12 | 10-1/2 | 11-3/8 | 17-15/16 | 9-1/4 | 1-1/4 | 8-3/4 | 16-1/4 | 4-1/4 |
| 14 | 11-7/8 | 14-3/4 | 20-5/16 | 11-1/2 | 1-5/16 | 10-3/4 | 18-3/4 | 4-1/2 |
| 16 | 13-1/2 | 14-1/2 | 22-9/16 | 12 | 1-3/8 | 12-3/4 | 21 | 5 |
| 18 | 14-3/8 | 15-3/8 | 24-11/16 | 12-1/4 | 1-3/8 | 12-3/4 | 23-1/4 | 5-1/4 |
| 20 | 16 | 17 | 27-3/32 | 12-1/2 | 1-1/2 | 14-3/4 | 25-1/2 | 5-1/2 |
| Actuator Size | Value Size | J | L | M | N | P | Q | R | Number of Turns |
| Unidade: polegada | |||||||||
| AMG-2S | 3-8″ | 4-11/16 | 2 | 2-1/8 | 2 | 4-1/2 | 4-1/4 | 8-1/4 | 32 |
| AMG-3S | 10-14″ | 5-5/8 | 2-7/16 | 3-1/4 | 3-5/32 | 5-5/8 | 5-3/8 | 10-3/8 | 30 |
| AMG-4S | 16&18″ | 6-3/8 | 2-27/32 | 3-3/8 | 4 | 7-5/16 | 6-3/4 | 11-5/16 | 40 |
| AMG-5 | 20″ | 7-9/16 | 3-15/32 | 4-1/2 | 5-1/2 | 8-3/4 | 10 | 17 | 44 |
Mechanical Joint 24"-48"
| TAMANHO (pol.) | A | B | C | D | E | F | G | X |
| Unidade: polegada | ||||||||
| 20 | 18-5/8 | 18-5/8 | 31-9/16 | 13-1/4 | 1-5/8 | 16-3/4 | 30 | 6-3/8 |
| 30 | 21-1/2 | 24-3/8 | 39 | 18 | 1-13/16 | 20-1 | 36-7/8 | 10 |
| 36 | 25-7/16 | 28-1/4 | 45-7/8 | 22 | 2 | 24-1 | 43-3/4 | 14 |
| 42 | 29-7/8 | 32-7/8 | 53 | 22 | 2 | 28-1-1/4 | 50-5/8 | 14 |
| 48 | 34-1/16 | 37-1/8 | 59-7/8 | 24 | 2 | 32-1-1/4 | 57-1/2 | 16 |
| Actuator Size | J | L | M | N | P | Q | R | Number of Turns |
| Unidade: polegada | ||||||||
| AMG-4S | 6-3/8 | 3-7/16 | 3-3/8 | 4 | 7-5/16 | 6-3/4 | 11-5/16 | 40 |
| AMG-5 | 7-9/16 | 3-1/2 | 4-1/2 | 5-1/2 | 8-3/4 | 10-7/16 | 17 | 44 |
| AMG-5S | 8-5/16 | 3-15/16 | 5-5/8 | 7 | 10-5/8 | 15-15/16 | 19-7/8 | 136 |
| AMG-6S | 9-7/8 | 5-1/16 | 7 | 8-1/4 | 12-5/8 | 18-5/8 | 26-1/2 | 215 |
250# Flanged Ends Specification for Butterfly Valve
Valves shall be built to a 250 psi rating, capable of withstanding pressures of 250 psi, and shall meet the following specifications:
Valve Bodies
- Material: Ductile iron ASTM A-536.
- End Connections: ANSI Class 250 with 250# drilling pattern.
Valve Discs
- Material: Ductile iron ASTM A536.
- Seating Edges: 316 stainless steel seating edges to match the rubber seat.
Valve Seat
- Material: Buna-N rubber, located on the valve body.
Valve Shafts
- Material: Stainless steel ASTM A-564 Type 630 Condition H-1150.
- Design: Both stub shafts and through shafts are acceptable.
Shaft Seals
- Type: Standard self-adjusting split “V” type packing.
- Design: Shaft seals can be replaced without removing the valve shaft.
Valve Bearings
- Type: Sleeve type bearings that are corrosion-resistant and self-lubricating.
Valve Actuators
- Grease-Packed: Actuators shall be fully grease-packed with stops in the open/closed positions.
- Mechanical Stop: The actuator shall have a mechanical stop capable of withstanding 450 ft/lbs of input torque.
- Alignment Grooves: The traveling nut must engage alignment grooves in the housing.
- Packing Leak Bypass: Actuators must have a built-in packing leak bypass to prevent leakage into the actuator housing.
Valve Interior and Exterior Surfaces
- Coating: All surfaces except for seating shall be coated with two coats of epoxy paint, following TT-C-494A and AWWA C504 latest edition.
Testing
- Leak Test: The valve shall undergo a leak test at 250 psi with the disc in the closed position.
- Hydrostatic Test: An internal hydrostatic pressure of 500 psi shall be applied for five minutes with the disc slightly open to test the valve body.
| TAMANHO (pol.) | A | B | C | D | E | F | G |
| Unidade: polegada | |||||||
| 4 | 5-1/2 | 3-1/2 | 10 | 5 | 1-1/4 | 8-3/4 | 7-7/8 |
| 6 | 7-1/4 | 8-3/8 | 12-1/2 | 6 | 1-7/16 | 12-3/4 | 10-5/8 |
| 8 | 8-1/2 | 9-5/8 | 15 | 8 | 1-5/8 | 12-7/8 | 13 |
| 10 | 9-3/4 | 11 | 17-1/2 | 8 | 1-7/8 | 16-1 | 15-1/4 |
| 12 | 11-1/2 | 12-5/8 | 20-1/2 | 8 | 2 | 16-1-1/8 | 17-3/4 |
| 14 | 12-3/4 | 13-7/8 | 23 | 12 | 2-1/8 | 20-1-1/8 | 20-1/4 |
| 16 | 14 | 15-1/8 | 25-1/2 | 12 | 2-1/4 | 20-1-1/4 | 22-1/2 |
| 18 | 15-1/4 | 16-3/8 | 28 | 12 | 2-3/8 | 24-1-1/4 | 23-3/4 |
| 20 | 17 | 17-5/8 | 30-1/2 | 12 | 2-1/2 | 24-1-1/4 | 27 |
| 24 | 19-3/4 | 20-1/4 | 36 | 12 | 2-3/4 | 24-1-1/2 | 32 |
| 30 | 25-5/8 | 26 | 43 | 12 | 8 | 21-1-3/4 | 39-1/4 |
| 36 | 28-1/8 | 31-1/8 | 50 | 15 | 3-3/8 | 32-2 | 46 |
| 42 | 32-1/8 | 35-1/8 | 57 | 15 | 3-11/16 | 36-2 | 52-3/4 |
| 48 | 36-1/4 | 39-5/8 | 65 | 15 | 4 | 40-2 | 60-3/4 |
| Actuator Size | J | L | M | N | P | Q | R | Number of Turns |
| Unidade: polegada | ||||||||
| AMG-2S | 4-11/16 | 2 | 2-1/8 | 2 | 4-1/2 | 4-1/2 | 8-1/4 | 32 |
| AMG-3S | 5-5/8 | 2-7/16 | 3-1/4 | 3-5/32 | 5-5/8 | 5-3/8 | 10-3/8 | 30 |
| AMG-4S | 6-3/8 | 2-27/32 | 3-3/8 | 4 | 7-5/16 | 6-3/4 | 11-5/16 | 40 |
| AMG-5 | 7-9/16 | 3-15/32 | 4-1/2 | 5-1/2 | 8-3/4 | 10 | 17 | 44 |
| AMG-5S | 8-5/16 | 3-15/16 | 5-1/2 | 7 | 10-1/2 | 5-15/16 | 19-718 | 136 |
| AMG-6S | 10-3/16 | 5-1/16 | 7 | 8-1/4 | 12-5/8 | 14-3/16 | 26-1/2 | 215 |
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Specs of Concentric Butterfly Valve
Classificação de pressão
The pressure rating of a Concentric Butterfly Valve indicates the maximum pressure it can safely handle. Most valves are designed to withstand pressures ranging from 150 to 300 PSI, making them suitable for various industrial applications. NTVAL offers valves with a wide range of pressure ratings to meet different operational needs.
Faixa de tamanho
Concentric Butterfly Valves come in various sizes, typically ranging from 2 inches to 48 inches in diameter. The size of the valve you choose will depend on the flow rate required and the size of the piping system. Here’s the bottom line: larger valves are used in systems where higher flow rates are necessary, while smaller valves are ideal for more controlled flow applications.
End Connection
Concentric Butterfly Valves are available with various end connection types, such as wafer, lug, and double flanged. The choice of end connection influences how the valve is mounted and how securely it fits into the piping system. Wafer and lug styles are common for systems requiring easy removal, while double-flanged connections provide additional stability for high-pressure applications.
Features of Concentric Butterfly Valve
Heavy Duty Bodies
The Concentric Butterfly Valves are built with heavy-duty bodies, allowing them to withstand tough environments. This strong construction means they are less likely to suffer from wear and tear, even in demanding conditions. With a strong body, the valve offers durability and a longer lifespan. Sounds impressive, right?
Streamlined Disc Design
The streamlined disc design in these valves allows for smoother flow with minimal resistance. This design reduces pressure loss across the valve, making it more efficient in controlling the flow of liquids and gases. The reduced turbulence also means less wear on the valve components, extending its operational life.
Self-Adjusting Packing
NTVAL's Concentric Butterfly Valves feature self-adjusting packing, which automatically adapts to maintain a tight seal. This feature reduces the need for frequent maintenance and ensures that the valve operates efficiently over time. With this reliable sealing, leaks are minimized, enhancing the overall safety and performance of the valve.
Benefits of Concentric Butterfly Valve
Durabilidade aprimorada
The Concentric Butterfly Valve is built to withstand demanding environments, thanks to its durable construction and corrosion-resistant materials. This durability results in a longer service life, reducing the need for frequent replacements. Industries can rely on this valve for consistent performance, even under challenging conditions.
Energy Efficiency
These valves are designed to minimize pressure drop across the valve, which helps maintain efficient flow within the system. By reducing the energy required to move fluid through the valve, the system's overall efficiency is improved. This energy-saving is particularly beneficial in large-scale operations where energy costs can be significant.
Baixa manutenção
With the self-adjusting packing feature, these valves require less frequent maintenance, which saves time and resources. This benefit is particularly valuable in large-scale operations where downtime can be costly. Reliable sealing also offers consistent performance, reducing the risk of unexpected failures.
Applications of Concentric Butterfly Valve
Setor de petróleo e gás
Concentric Butterfly Valves are essential in the oil and gas industry for controlling the flow of various fluids, including crude oil, natural gas, and refined products. These valves are used in pipelines, refineries, and storage facilities to regulate flow efficiently. NTVAL valves, with their durable construction, offer safe and reliable operation in this critical sector.
Water Treatment Plants
In water treatment plants, these valves are used to manage the flow of water through different stages of the treatment process. They help control the flow rate, guaranteeing that water is processed effectively for safe distribution. An example would be their use in regulating the flow of water between filtration and disinfection stages, providing consistent water quality.
Processamento químico
The chemical processing industry relies on Concentric Butterfly Valves to handle various chemicals safely and efficiently. These valves are particularly useful in managing corrosive fluids due to their sturdy design. And on top of that, these valves are chosen for their ability to maintain a tight seal, which is crucial for preventing leaks in hazardous environments.
Indústria de papel e celulose
In the pulp and paper industry, Concentric Butterfly Valves are often used to manage the flow of water and chemicals through various processing stages. They help control the consistency and pressure of the slurry mixtures and water, critical for producing high-quality pulp. NTVAL’s resilient valves meet the demands of this industry by providing smooth flow management, ensuring uninterrupted operation.
3 Considerations When Buying a Concentric Butterfly Valve
01
Corrosion Resistant Shafts
When buying a Concentric Butterfly Valve, it’s important to consider whether the valve has corrosion-resistant shafts. These shafts are crucial for maintaining the integrity of the valve, especially in harsh environments like chemical plants or offshore oil rigs. NTVAL offers valves with corrosion-resistant shafts, providing long-lasting performance even when exposed to corrosive substances.
02
Self-Lubricating Bearings
Another key consideration is whether the valve features self-lubricating bearings. These bearings reduce friction and wear over time, leading to smoother operation and less maintenance. For example, in a large oil refinery, self-lubricating bearings in these valves can help maintain continuous operation without frequent shutdowns for maintenance.
03
Through-Disc Pinning
Through-disc pinning is an important consideration that helps the valve disc stay securely attached to the shaft, even under high stress. This is particularly essential in high-pressure systems where any failure could lead to significant safety risks. Here’s the big secret: when buying a valve for a large project, such as in power generation, selecting a valve with through-disc pinning can offer extra reliability and peace of mind.
Perguntas frequentes
The Concentric Butterfly Valve features a resilient elastomer seat that provides a bubble-tight seal, making it ideal for low-pressure applications.
We provide technical assistance and troubleshooting for any issues that arise with the valves. Clients can also receive replacement parts or a new valve within the warranty period if needed.
Yes, our Concentric Butterfly Valves are versatile, offering both on/off control and the ability to regulate flow, making them suitable for various industrial applications.
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