Formed Bellows : Made by rolling and welding a flat sheet into a tube, then mechanically formed into widely spaced, rounded folds. Welded Leaf Bellows : Made from thin, washer-like plates welded together on both the inside and outside, with more folds per unit length than formed bellows.

Same for both bellows types, but formed bellows are 2-3 times longer than welded leaf bellows for the same stroke rate.

Lower end and stem assembly are welded using automated seam welding. Upper end is welded onto the connecting plate, forming a metal shield to prevent valve stem leakage.

Positioned on the bellows as an auxiliary seal for enhanced durability and protection.

Bellow Seal Globe Valve

Trusted Bellow Seal Globe Valve Manufacturer

NTVAL produces durable Bellow Seal Globe Valves for industrial use. Built for reliability in tough environments, our precision-engineered valves deliver long-lasting performance, consistently meeting the highest standards for quality.

Reliable Bellow Seal Globe Valve

Control de calidad

A PMI (Positive Material Identification) test checks the metal composition of a Bellow Seal Globe Valve. This process guarantees that the valve is made of the correct materials, preventing any possible errors in production.

Prueba PMI

During a sealing test, the Bellow Seal Globe Valve is checked for leaks. Engineers monitor its performance to make sure it provides a tight seal, avoiding unwanted leakage in operation.

Prueba de estanquidad

The low emission test measures how well the Bellow Seal Globe Valve limits gas or vapor leaks. This is crucial for controlling emissions, especially in sensitive environments.

Prueba de bajas emisiones

An impact test subjects the Bellow Seal Globe Valve to sudden force to assess its durability. The valve must resist breaking or deforming when hit with external force.

Prueba de impacto

Dimension inspection measures every part of the Bellow Seal Globe Valve, ensuring it fits its exact specifications. This step helps verify that the valve’s size meets the required standards.

Inspección dimensional

The painting thickness test checks the coating on the Bellow Seal Globe Valve. It confirms that the valve has the proper protection layer to prevent rust or wear.

Prueba de espesor de pintura

In the PT test, engineers apply a liquid to the Bellow Seal Globe Valve’s surface to find cracks or flaws. It helps in identifying any hidden issues that may not be visible.

PT

Material inspection involves verifying the raw materials used in making the Bellow Seal Globe Valve. This test confirms that the valve has the required strength and composition for its intended use.

Inspección de materiales

Aplicaciones de nuestras válvulas en sectores clave

Descubra cómo nuestras avanzadas soluciones de válvulas mejoran el control del flujo, ofreciendo mayor eficacia, seguridad y una estricta garantía de calidad.

The Bellow Seal Globe Valve provides reliable, leak-free performance in chemical processing, preventing harmful substances from escaping, which enhances safety and efficiency.

Procesado químico

In the petrochemical industry, the Bellow Seal Globe Valve helps control fluids and gases. Its strong sealing design makes it operate safely in harsh environments.

Gasolina Química

The Bellow Seal Globe Valve is critical for O.P.G and nuclear industries because it minimizes leaks, protecting workers and the environment from hazardous substances.

O.P.G & Nuclear

In the pulp industry, the Bellow Seal Globe Valve handles high temperatures and pressures, maintaining smooth flow control and reducing maintenance costs over time.

Pulp

Mining operations benefit from the Bellow Seal Globe Valve’s durability, as it withstands tough conditions while controlling the flow of abrasive and corrosive materials.

Minería

The Bellow Seal Globe Valve is ideal for water and sewage systems, offering leak-proof operation and corrosion resistance, which leads to long-lasting performance in damp environments.

Agua y alcantarillado

In steam systems, the Bellow Seal Globe Valve effectively controls steam flow while preventing leaks, which allows for safe and efficient operations in high-temperature settings.

Sistema de vapor

Boiling systems rely on the Bellow Seal Globe Valve for precise control of pressure and temperature, preventing leaks and maintaining system efficiency throughout its use.

Sistema de ebullición

Obtenga una válvula más versátil

Válvula de compuerta

Válvula de bola

Válvula de globo

Válvula de retención

Válvula de tapón

Válvula de mariposa

Construction of Bellows Seal Globe Valve

Metal Bellows:

Formed Bellows: Made by rolling and welding a flat sheet into a tube, then mechanically formed into widely spaced, rounded folds.
Welded Leaf Bellows: Made from thin, washer-like plates welded together on both the inside and outside, with more folds per unit length than formed bellows.

Movement Per Fold:

Same for both bellows types, but formed bellows are 2-3 times longer than welded leaf bellows for the same stroke rate.

Welding Process:

Lower end and stem assembly are welded using automated seam welding.
Upper end is welded onto the connecting plate, forming a metal shield to prevent valve stem leakage.

Valve Disc and Structure:

Precisely ground sealing surface, pressure tested to ensure no leakage.

Stuffing Box:

Positioned on the bellows as an auxiliary seal for enhanced durability and protection.

High-Pressure Valve Metal Bellows:

Multi-layer design allows them to handle up to 10,000 open/close cycles at the highest pressure using hydroforming.

How Does Bellow Seal Globe Valve Work

A Bellows Seal Globe Valve is a compact control valve that uses bellows to seal the valve stem components. Inside the valve, the lower end of the stainless-steel bellows is welded to the stem to protect it from erosion by the system fluid. The other end of the bellows is positioned between the valve body and the valve cover to create a permanent seal.

This double seal configuration eliminates leakage, as stem packing will prevent further leakage even if the bellows collapses. The bellows are welded to the valve stem to maintain stable operating efficiency and reduce vibration of the valve stem caused by the movement of the valve insert.

Advantages of Bellows Seal Globe Valve

Comparison of Bellows Seal Globe Valve with Normal Valves

Leakage Prevention

In systems using gland packing valves, such as gate or ball valves for heated oil transfers, there is a high risk of hot oil spillage due to the permeability of heated oil being about 50 times that of steam. This can lead to significant equipment and property damage. The bellows valve, due to its design, provides a complete seal, preventing any leakage.

Graphite Packing Issues

Ordinary valves with graphite packing often fail to provide effective sealing, leading to frequent leakage. If the graphite in the packing is not pure, its oil resistance is compromised. Heated oil interacting with graphite fillers can cause impurities to separate and flow with the oil, worsening leakage issues.

High-Temperature Performance

Ball valves used with heated oil may experience rapid deterioration of internal PTFE if it is not resistant to high temperatures, leading to valve leakage. In contrast, the bellows valve’s internal parts, made of stainless steel, can withstand temperatures up to 425°C.

Durability and Cost Efficiency

The bellows valve typically has a lifespan exceeding three years. For systems handling heated oil, bellows shut-off valves are preferred over ordinary seal valves to maintain reliable operation and reduce running costs.

Selection Guide for Bellows

Application Range of Bellows Seal Globe Valve

Bellows valves effectively eliminate the risk of leakage in process fluids, making them ideal for applications where leakage is unacceptable. They are particularly suited for handling highly hazardous materials such as hydrogen, ammonia, chlorine, and other poisonous or explosive substances.

These valves are also suitable as shut-off valves for pipelines carrying heat-conducting oil, toxic, flammable, highly permeable, environmentally polluting, and radioactive fluids. They are a high-quality choice for creating a leak-free environment in various industrial settings.

Bellows seal globe valves are extensively used in industries such as petrochemical, electronics, and vacuum technology, among others.

Precautions for Bellows Seal Globe Valve

Read Warnings and Instructions

To prevent damage or injury to personnel and equipment, always read all warnings and instructions. Improper re-conditioning, using foreign replacement parts, or incorrect maintenance can lead to reduced efficiency, injury, or damage.

Double Seal for Corrosive Environments

In highly corrosive chemical environments, use double seal bellows to provide two layers of protection. A smell of media in the air or a wet valve cover usually indicates damage to the bellows.

Replace Damaged Bellows Promptly

Replace damaged bellows as soon as possible to avoid prolonged issues, safety hazards, and potential damage to the entire valve. This can be done by the user or the manufacturer.

Avoid Over-Tightening Gland Nut

Avoid excessively tightening the gland nut, as it can lead to excessive packing wear and restrict the movement of the plug stem.

Reasons for Leakage of Bellow Seal Globe Valve

There are many reasons for the leakage of a Bellows Seal Valve. Bellows valve leakage is generally divided into internal leakage and external leakage.

Impurities and Valve Structure

Leakage often occurs because the liquid medium contains solid impurities that damage the sealing surface, leading to failure. Analysis of on-site usage reveals that leakage of the valve stem is primarily related to the valve structure, working environment, and operation mode.

Double-Sealing Structure

The valve stem features a double-sealing structure with bellows and packing. The bellows are welded with both the inner and outer lining rings, forming an assembly attached to the valve stem and guide body. This setup blocks medium leakage through the valve stem.

However, if the valve is opened excessively, the flat key can embed in the PTFE packing, causing the bellows assembly to be damaged and resulting in medium leakage along the valve stem.

Tensile and Compression Limits

Tensile elongation and compression of the bellows valve can lead to leakage if these forces exceed the design limits. Excessive tension or compression may damage the bellows, causing hose rupture and seal failure. To address this, a limit device should be added to keep the bellows expanding and contracting within the design range during valve operation.

Product Features Rising Stem Bellow Globe

Variantes

DN 15-50 PN 10-40

DN 65 PN10/16

DN 65 PN25/40

DN 80-100 PN 10-40

DN 15-100

Throttle Cone, Position Indicator, Locking Device and Travel Stop

Dimensiones

Product Features Non-Rising Stem Bellow Globe

Dimensiones

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Más información general

Specs of Bellow Seal Globe Valve

Construcción material

Bellow Seal Globe Valves are made from strong materials like stainless steel, cast steel, and alloy steel. These materials are chosen because they don’t rust easily and can handle tough conditions. This makes the valves last longer and work well in different industries.

Presión nominal

These valves can handle different pressure levels, often up to 1500 PSI. This means they can be used in high-pressure situations, like in oil and gas or chemical plants. The pressure rating helps determine where the valve can be safely used.

Temperatura

NTVAL Bellow Seal Globe Valves can operate in a wide range of temperatures, from -20°C to 400°C (-4°F to 752°F). What do I mean? This means they can work well in very hot or cold conditions. The ability to withstand different temperatures makes these valves versatile for many applications.

End Connection Types

The valves come with various end connection types, such as flanged, threaded, and welded. These connections allow the valves to fit into different piping systems. Choosing the right end connection is important for proper installation and operation in different setups.

Features of Bellow Seal Globe Valve

Long Service Life

The durable construction of Bellow Seal Globe Valve results in a long service life. Materials like stainless steel and alloy steel resist corrosion and wear, reducing the need for frequent replacements. I guess this longevity makes them a cost-effective choice for industries requiring reliable valve performance over time.

Hard-Faced Trim

Bellow Seal Globe Valves often come with hard-faced trim, including the seat and disc. This feature uses hardened materials like stellite to coat these components, enhancing their resistance to wear and erosion. Hard-faced trim is particularly useful in applications involving abrasive or corrosive fluids.

Position Indicator

Many Bellow Seal Globe Valves are equipped with a position indicator. This feature shows the valve's open or closed position, allowing operators to quickly and easily assess the valve's status. The position indicator enhances operational control and provides accurate valve operation during processes.

Benefits of Bellow Seal Globe Valve

Long Lifespan

Floating ball valves are built to last, providing long-term service with minimal maintenance. Their durable construction means they can handle high pressures and temperatures over extended periods. This reliability reduces the need for frequent replacements.

Enhanced Leak Prevention

Bellow Seal Globe Valves offer excellent leak prevention due to their unique bellow seal design. This helps maintain a tight seal, preventing the escape of fluids, which is especially important in handling hazardous or toxic substances. We at NTVAL make sure to give this benefit to our partners for a successful, and more efficient operations.

Improved Process Efficiency

The precise control offered by Bellow Seal Globe Valves leads to improved process efficiency. Operators can accurately regulate flow rates, providing optimal performance in various industrial processes. This precision helps reduce waste and improves overall system efficiency, leading to better productivity.

Applications of Bellow Seal Globe Valve

Oil and Gas Industry

In the oil and gas industry, Bellow Seal Globe Valves are crucial for controlling the flow of crude oil, natural gas, and other fluids. I am impressed by how their ability to handle high pressures and temperatures makes them suitable for upstream, midstream, and downstream applications. They help manage the safe transport and processing of these resources.

Generación de energía

In power generation plants, Bellow Seal Globe Valves are used to regulate the flow of steam, water, and other fluids. Their ability to withstand high temperatures and pressures makes them suitable for use in both conventional and renewable energy systems. These valves help maintain efficient and safe power plant operations.

Procesado químico

These valves are widely used in chemical processing industry. They are ideal for handling corrosive and hazardous chemicals because of their leak prevention features. The precise flow control these valves offer is essential for maintaining accurate chemical reactions and ensuring safe operations. If you are in this industry and looking for a durable Bellow Seal Globe Valves, choose NTVAL.

Nuclear Power & O.P.G

In nuclear power plants and gas systems, safety is crucial. Bellow Seal Globe Valves are perfect for preventing leaks of harmful materials like radioactive fluids. These valves are built to handle extreme conditions, controlling the flow of steam or liquids without breaking down easily.

Considerations When Buying Bellow Seal Globe Valve

01 4-Inch Diameter Size

When buying a Bellow Seal Globe Valves, confirm the appropriate size, such as a 4-inch diameter, to match your pipeline specifications. For example, if your system requires handling a certain flow rate, a 4-inch valve can accommodate the necessary capacity. My point is always knowing your project needs to avoid choosing the wrong size of valve.

02 PTFE-Lined Stainless Steel

When buying a Bellow Seal Globe Valves, consider the material, such as PTFE-lined stainless steel, for enhanced chemical resistance. For example, if your application involves corrosive fluids, PTFE-lined stainless steel offers excellent durability and protection against chemical reactions, ensuring longer valve life and backflow prevention.

03 API607 Certified

When choosing a Bellow Seal Globe Valve, look for API 607 certified just like what NTVAL offers. This certification confirms that the valve can withstand fire conditions, providing safety and reliability, especially in applications involving flammable materials. API 607 certified valves are crucial for preventing leaks and potential hazards in case of a fire.

FAQ's

1. What is the warranty period for the Bellow Seal Globe Valve?

Our standard quality guarantee period for the Bellow Seal Globe Valve is 18 months from the date of delivery. This makes sure that our customers are covered for any defects in materials or workmanship during this time frame.

2. Is the installation of a Bellows Seal Globe Valve safer for working personnel?

Yes, the installation of a Bellow Seal Globe Valve improves the safety of working personnel by minimizing emissions of inflammable, toxic, and hazardous chemicals.

3. What service will you offer if the Bellow Seal Globe Valve has issues?

We provide technical support to troubleshoot issues, guidance on valve operation, and solutions to any problems. We can send replacement parts or a new valve. Repairs or replacements are available within the warranty period.

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CUERPO	BONNET	BELLOW	DISC	NUT	EMBALAJE	JUNTA	SEALING FACE	SUITABLE MEDIUM	SUITABLE TEMP.
GS-C25/GS-C25 N/GP240GH/ 1.0619	GS-C25/GS-C25 N/GP240GH/ 1.0619	SS304	Y	YK	Graphie	SS304+ Graphite	13Cr/13Cr 13Cr/STL STL/STL	WATER OIL GAS	≤350℃
1.4308	1.4308	SS304	0Cr18Ni9	0Cr18Ni9	PTFE/ Graphite	SS304+ Graphite	304/304 STL/304 STL/STL	Corrosive Media	≤200℃
1.4408	1.4408	SS316L	0Cr18Ni9	0Cr18Ni9	PTFE/ Graphite	SS304+ Graphite	316/316 STL/316 STL/STL	Corrosive Media	≤200℃
						Graphite/PTFE	STL/316 STL/STL	Media	Corrosive Media

Cara a cara	EN 558-1/DIN 3203F1
Brida final	EN 1092-1/DIN 2501
Soldadura a tope	EN 12627
Clase	PN16, PN25

SIZE (DN)	L1	L2	h1	h2	d1	d2	a	D	k	nxd3	C	W.T(kg)
												Straight Way	Angel
													Unit: mm
15	130	90	175	150	125	47	137	95	65	4×14	14	3.1	3.2
20	150	95	178	153	125	47	140	105	75	4×14	16	4	4
25	160	100	184	151	125	47	146	115	85	4×14	16	4.7	4.8
32	180	105	205	170	125	47	161	140	100	4×19	18	7.3	7.5
40	200	115	210	172	125	47	166	150	110	4×19	18	7.7	7.7
50	230	125	235	198	160	51	190	165	125	4×19	20	10.2	9.6
65	290	145	246	198	160	51	201	185	145	4×19	20	17	16.3
80	310	155	282	226	200	60	223	200	160	8×19	22	22	21.8
100	350	175	304	244	200	60	245	220	180	8×19	24	32	30.8
125	400	200	390	316	250	80	310	250	210	8×19	26	54	48.3
150	480	225	408	320	250	80	328	285	240	8×23	26	70.5	65.7
200	600	275	570	468	400	93	440	340	295	12×23	30	130	114.2
250	730	325	606	480	400	93	476	405	355	12×23	32	230	180.5
300	850	375	660	510	400	93	530	460	410	12×28	32	328	267.5

SIZE (DN)	L1	h1	d1	d2	a	D	k	nxd3	C	W.T(kg)
										Straight Way
										Unit: mm
5	130	175	125	47	137	95	65	4×14	14	3.1
20	150	178	125	47	140	105	75	4×14	16	4.1
25	160	184	125	47	146	115	85	4×14	16	4.6
32	180	205	125	47	161	140	100	4×19	18	8.2
40	200	210	125	47	166	150	110	4×19	0	8.5
50	230	235	160	51	190	165	125	4×19	20	11
65	290	246	160	51	201	185	145	8×19	20	17
80	310	282	200	60	223	200	160	8×19	22	28.9
100	350	304	200	60	245	235	190	8×23	24	40
125	400	390	250	80	310	270	220	8×28	26	65
150	480	408	250	80	328	300	250	8×28	26	89

Trusted Bellow Seal Globe Valve Manufacturer

Reliable Bellow Seal Globe Valve

Control de calidad

Prueba PMI

Prueba de estanquidad

Prueba de bajas emisiones

Prueba de impacto

Inspección dimensional

Prueba de espesor de pintura

PT

Inspección de materiales

Aplicaciones de nuestras válvulas en sectores clave

Procesado químico

Gasolina Química

O.P.G & Nuclear

Pulp

Minería

Agua y alcantarillado

Sistema de vapor

Sistema de ebullición

Obtenga una válvula más versátil

Construction of Bellows Seal Globe Valve

How Does Bellow Seal Globe Valve Work

Advantages of Bellows Seal Globe Valve

Comparison of Bellows Seal Globe Valve with Normal Valves

Leakage Prevention

Graphite Packing Issues

High-Temperature Performance

Durability and Cost Efficiency

Selection Guide for Bellows

Application Range of Bellows Seal Globe Valve

Precautions for Bellows Seal Globe Valve

Read Warnings and Instructions

Double Seal for Corrosive Environments

Replace Damaged Bellows Promptly

Avoid Over-Tightening Gland Nut

Reasons for Leakage of Bellow Seal Globe Valve

Product Features Rising Stem Bellow Globe

Variantes

Dimensiones

Face-To-Face Dimension

Flanges

Other Flange Designs

Product Features Non-Rising Stem Bellow Globe

Dimensiones

EN/DIN Standard Non-Rising Stem Bellow Globe Valve

¿Quiere colaborar con un experto? Mariposa Puerta Globo Consulte Bola Controlar Seguridad ¿Proveedor de válvulas?

Más información general

Specs of Bellow Seal Globe Valve

Construcción material

Presión nominal

Temperatura

End Connection Types

Features of Bellow Seal Globe Valve

Long Service Life

Hard-Faced Trim

Position Indicator

Benefits of Bellow Seal Globe Valve

Long Lifespan

Enhanced Leak Prevention

Improved Process Efficiency

Applications of Bellow Seal Globe Valve

Oil and Gas Industry

Generación de energía

Procesado químico

Nuclear Power & O.P.G

Considerations When Buying Bellow Seal Globe Valve

01

4-Inch Diameter Size

02

PTFE-Lined Stainless Steel

03

API607 Certified

FAQ's

Profundice en nuestros recursos