Trusted Gate Valve Manufacturer

NTVAL provides durable Gate Valves for industrial use, offering excellent sealing and reliable operation in tough environments. ISO9001 and API6D certified, our valves ensure long-lasting performance and cost efficiency.

Reliable Gate Valve

NTVAL offers high-quality Gate Valves designed for industrial use. Our Gate Valves are known for their durability, excellent sealing performance, and reliable operation in demanding environments. With certifications from ISO9001 and API6D, we guarantee top-tier products. No wonder our valves provide long-lasting performance and cost efficiency.
Gate Valve 1

Quality Control

Gate Valve 2
The PMI test verifies that the gate valve’s material matches the specified metals, making sure it is appropriate for its intended use.
PMI Test
Gate Valve 3
The sealing test checks the gate valve for leaks by confirming it closes tightly and securely, keeping fluids contained without escaping.
Sealing Test​
Gate Valve 4
The low emission test examines the gate valve’s ability to limit harmful gas releases, helping to maintain a safer environment for workers.
Low Emission Test​
Gate Valve 5
The impact test evaluates whether the gate valve can withstand force or shock without breaking, proving it can function in tough conditions.
Impact Test​
Gate Valve 6
Dimension inspection measures the gate valve’s components to verify they meet design specifications, confirming proper fit and function within the system.
Dimension Inspection​
Gate Valve 7
The painting thickness test determines how thick the valve’s paint coating is, helping verify its ability to protect against rust and corrosion.
Painting Thickness Test​
Gate Valve 8
PT, or penetrant testing, detects tiny surface cracks on the gate valve by applying a special liquid that highlights any hidden defects.
PT
Gate Valve 9
Material inspection checks that the raw materials used in the gate valve meet the necessary standards for strength and durability.
Material Inspection​

Our Valve Applications in Key Industries

Discover how our advanced valve solutions improve flow control, delivering enhanced efficiency, safety, and strict quality assurance.
Gate Valve 10
Gate valves are ideal for the chemical processing industry because they handle strong chemicals safely, controlling the flow without leaking.
Chemical Processing
Gate Valve 11
Gate valves work well in the petrol chemical industry by regulating the flow of oil and gas, preventing spills and maintaining safety.
Petrol Chemical
Gate Valve 12
Gate valves provide reliable control in O.P.G and nuclear industries, managing the flow of critical fluids under extreme pressure and conditions.
O.P.G & Nuclear
Gate Valve 13
In the pulp industry, gate valves control the movement of thick liquids, helping maintain smooth operations without clogging or interruptions.
Pulp
Gate Valve 14
Gate valves are essential in water and sewage systems, allowing workers to control water flow for treatment and distribution with ease and reliability.
Mining
Gate Valve 15
Gate valves are essential in water and sewage systems, allowing workers to control water flow for treatment and distribution with ease and reliability.
Water & Sewage
Gate Valve 16
Gate valves in steam systems control high-temperature steam, making it easier to manage pressure and maintain safe operations across facilities.
Steam System
Gate Valve 17
In boiling systems, gate valves regulate water flow and steam, helping boilers function efficiently while preventing dangerous overflows or malfunctions.
Boiling System

Get More Versatile Valve

Main Parameters

 

Ansi Std.Gate
Valves

Class 150 Lb-2500 Lb Size 1/2″~60″

Din Std.Gate
Valves

Dn50~dn1200, Pn16~pn420

Jis Std.Gate Valves

Dn15~dn800 10 K~40 K

Bs Std.Gate Valves

Dn15~dn800, Pn16~pn420

Design &
Manufacture Std.

Api600,api 6 D,asme B16.34,api603 Bs1414,din3352,bs1984 Etc.

Face to Face Std.

Asme B16.10,api 6 A,,din3202,en558,bs2080,mss Sp-81,jis
B2002,nfe29-305,iso5752 Etc.

End Connection Std

Asme B16.5,asme B16.11,asme B1.20.1,asme B16.25,en1092-1,
Din2501,din2543-2550 ,jisb2212-Jisb2214,jis2220 (connection Type:
Rf,ff,rtj,bw,sw,npt,)

Test Standard

Api598,api 6 D,bs 6755,din3230,en12266 ,jis B2003

Operated Type

Handwheel, Bevel Gear , Pneumatic, Electric, Bare Stem with Iso 5210 Top
Mounting Pad

Material

Carbon Steel: A216 Wcb, Wcc, Wc1, Astm A105
Stainless Steel: A351 F8 (f304), Cf8 M (f316), Cf3 (f304 L), Cf3 M (f316 L), Cf8 C (f347), F321, F321 H, Ck20
Alloy Steel: Monel 400, Monel K500, Alloy 20, 904 L, Cn7 M, Inconel, Hastelloy B & C, Titanium Alloy
Duplex Stainless Steel: A351 Cn7 M (b473), Cd4 M Cu (f50), Ck3 M Cu N (f44), Cg8 M, A890-1 A, 4 A, 5 A, 6 A, A182 F44, F50, F51, F53, F310
Low Temperature Steel: A352 Lcb, Lcc, Lca, Lc3, A350 Lf2, Lf3
High Temperature Steel: A217 Wc6, Wc9, Wc5, Wc11, C5, C12, C12 A, A182 F22, F11, F5, F9
Bronze, Nickel Aluminum Bronze (nab), Gunmetal: B148 C95500, C95800, C95400, C83600, C92200, Astm B62, B61, B150 C63200
Din Material: Gs-C25/1.0619, 1.4408, 1.4308, C22.8

Gate Valve
Catalogue

Gate Valves Catalogue (5.4 Mb)din Gate Valves Catalogue(1.4 Mb)

Special Gate Valves

Except for Common Gate Valves,we Also Produce Cryogenic Gate Valves,
Bellow Sealed Gatevalve,jacketed Gate Valves,through Conduit Gate
Valve,parallel Slide Gate Valve,knife Gate Valve,high-Temperature Gate
Valve,high pressure valves etc.

Gate Valve Design

Gate valve Bonnet Design

The bonnet of a gate valve ensures a leakproof seal for the valve body. Screw-in bonnets offer a simple, durable seal, union bonnets are ideal for easy inspection and cleaning, and bolted bonnets are used in larger, high-pressure valves. A pressure seal bonnet, designed for high-pressure applications above 15 MPa (2250 psi), tightens the seal as internal pressure increases, preventing leaks at the body-bonnet joint.

Gate Valve Disc Design
The disc in a gate valve can be designed as either a solid or flexible wedge, or as a parallel disc. A solid wedge provides a strong and simple closure, while a flexible wedge allows for slight movement to accommodate pressure changes, reducing the risk of jamming. The parallel disc design uses two discs that close against each other, offering a tight seal and smoother operation in certain conditions.
Stem Design in Gate Valves
Gate valves come with either a rising or non-rising stem. Rising stems show the valve’s position visually, while non-rising stems are used in areas with limited vertical space or underground installations. NTVAL valves feature a one-piece wrought stem, not welded, with a “T” type connection to the disc, providing a strong and reliable bond that meets API 591 strength standards.
Seat Design in Gate Valves
In carbon steel gate valves, the seat is typically made of forged steel, with the sealing surface welded with a customer-specified hard alloy. For valves NPS 10 or smaller, a renewable threaded-in seat ring is standard, with the option for a welded-on seat if needed. In stainless steel gate valves, the seat is either integral or welded with a hard alloy, with the choice of a threaded-in or welded-on seat also available.
Back Seat Design in Gate Valves
All NTVAL gate valves feature a back seat design. Typically, carbon steel gate valves have a renewable back seat, while in stainless steel valves, the back seat is machined directly into the bonnet or after welding. When the gate valve is fully open, the back seat provides a reliable seal, though API 600 guidelines advise against adding or changing the packing under line pressure.
Body-Bonnet Gasket Design in Gate Valves
For Class 150 gate valves, a combination of carbon steel or stainless steel with flexible graphite is used for the gasket. In Class 300 and Class 600 gate valves, a stainless steel and flexible graphite spiral wound gasket is standard, with the option for a ring-type joint gasket in Class 600 valves. For Class 900 valves, a ring-type joint gasket is used, while pressurized seal designs are applied to Class 1500 to Class 2500 valves.
Gate Valve Packing Seal Design
Molded flexible graphite is commonly used as the packing material in gate valves, with PTFE or a combination of materials available if needed. The internal surface of the stuffing box, where it contacts the packing, is finely finished for smoothness, while the stem surface is carefully machined and treated for a high level of finish and compactness. This attention to detail helps create a secure and tight seal in the stem area.
Stem Nut Features in Gate Valves

The stem nut is typically made from copper alloy or ASTM A439 D2. For larger gate valves, such as NPS 10 for Class 150 or NPS 8 for Class 300, a rolling bearing is added beneath the stem nut to reduce the force needed to open and close the valve. This design helps make operating the valve easier, especially in larger sizes, ensuring smoother and more efficient operation under higher pressure conditions.

Gate Valve Operation Methods
Gate valves are typically operated using a hand wheel or gearbox, with the option for a chain wheel if needed. For valves that require actuation, the top flange dimensions are made according to ISO 5211 standards. These options provide flexibility in how the valve can be controlled, depending on the application.
Belleville Spring-Loaded Packing Option
If needed, Belleville spring-loaded packing can be added to improve the durability and reliability of the packing seal. This feature helps maintain a tight seal over time, providing consistent valve performance. It’s an option that can be used when extra reliability is important.

Gate Valve Types

Gate valves come in various designs, each suited to specific applications and operational needs. The type of gate valve often depends on how the valve stem is designed, which influences how the valve operates and its ease of use. Understanding these different types helps in selecting the right valve for a given application.
 

1. Based on Valve Stem designed

Gate valves can be categorized based on how their valve stem is designed, which directly impacts their operation and functionality. The stem design determines how the valve opens and closes, as well as how the valve’s position is indicated. Understanding these differences is crucial for selecting the right valve for specific operational needs. Below are the different types of gate valves based on their stem design:

Rising Stem Gate Valve

In this design, the stem nut is located on the valve bonnet or bracket. When the valve is operated, the stem rotates, lifting the gate to open or lowering it to close. This design is popular because it allows for easy lubrication of the stem and provides a clear indication of whether the valve is open or closed.

Non rising stem gate valve

In a non-rising stem gate valve, the stem nut is located within the valve body and comes into direct contact with the fluid. The benefit of this design is that the valve’s height remains constant, making it ideal for situations where space is limited or for larger diameter valves. However, the downside is that the stem cannot be lubricated, and its direct exposure to the fluid can lead to erosion and damage over time.
Gate Valve 24
Gate Valve 25

2. Based on gate configuration

Gate valves can also be classified according to their gate configuration, which influences how they seal and operate. The configuration of the gate, whether single or double, affects the valve’s ability to manage flow and maintain a secure seal. Below are the different types of gate valves based on their gate configuration.
Gate Valve 26

Parallel Slide Gate Valve Design

A parallel slide gate valve comes in two variations: single gate and double gate. In this design, the sealing surfaces are parallel to the vertical centerline of the valve, with the double gate version featuring two parallel sealing surfaces. This design helps in maintaining a consistent seal when the valve is closed.
 

Wedge Gate Valve Design

Wedge gate valves come in three types: single gate, double gate, and flexible gate. In these valves, the sealing surfaces are angled relative to the vertical centerline, creating a wedge shape. This design helps in achieving a tight seal when the valve is closed.

Gate Valve Configuration and Working Principle

A gate valve uses a gate to open and close, moving vertically against the flow of fluid. This valve is designed only for shutting off flow and is not suitable for adjusting or throttling. Gate valves can have either self-sealing or forced sealing mechanisms; in self-sealing, the fluid pressure presses the gate against the valve seat, while in forced sealing, external force is applied to create a tight seal.
 
When the valve is fully opened, the gate lifts to a height equal to the valve diameter, allowing unimpeded flow. However, the gate’s exact position cannot be monitored during operation. To ensure the valve is fully open, it’s common to turn the handwheel to its maximum and then back off slightly. This helps account for possible handwheel locking due to temperature changes and provides a reliable indication of the fully open position.

Advantages of Gate Valve

Gate valves are widely used in various industries due to their efficient and straightforward design. They offer several key benefits that make them a preferred choice for controlling fluid flow in pipelines. Below are the primary advantages that contribute to the reliability and versatility of gate valves in different applications:
Low Flow Resistance
Gate valves are designed with a straight-through path, allowing fluid to move directly without many obstacles. This design minimizes resistance, making the flow smoother and more efficient. It’s ideal for applications where maintaining high flow rates is important.
Effortless Operation
The gate in these valves moves perpendicular to the fluid flow, which makes opening and closing the valve easy. This simple movement reduces the effort needed during operation. It’s especially useful in systems where frequent valve adjustments are necessary.
Flexible Installation
Gate valves are symmetrical, allowing fluid to flow in either direction through the valve. This feature simplifies the installation process, making it easier to adapt to various piping layouts. It’s a practical choice for systems requiring flexibility in flow direction.
Compact Design
With a short end-to-end dimension, gate valves occupy less space between connection points. This compact size makes them suitable for installations where space is limited. The design also allows for easier integration into existing systems.
Simple and Versatile
The straightforward design of gate valves makes them easy to manufacture and apply in many settings. Their versatility allows them to be used across different industries. This makes gate valves a common choice for various fluid control applications.

Disadvantages of Gate Valves

While gate valves have many benefits, they also have some drawbacks that should be considered. Below are the key disadvantages of gate valves:

Susceptibility to Erosion and Scratches

Gate valves are prone to erosion and scratches on their sealing surfaces, which can complicate maintenance. These imperfections can lead to leaks and reduced sealing efficiency. Over time, the wear and tear can make the
valve less reliable.

Large Size and Space Requirements

Gate valves are large and require significant space for operation. This makes them less suitable for areas with limited space. Additionally, the time needed to fully open or close the valve is longer compared to other valve types.

Exposed Stem Packing

The stem packing in gate valves is often exposed, making it more vulnerable to wear. This exposure can lead to leaks over time, reducing the valve’s effectiveness. Regular maintenance is required to address these issues and ensure proper function.

Primary Applications of Gate Valves

Gate valves are widely used in various industries, particularly in oil and gas pipelines where they help control the flow of crude oil and natural gas. They are also essential in managing pipelines and storage facilities for refined oil products. Additionally, gate valves play a crucial role in oil and gas mining wellhead facilities, ensuring smooth operation and safety.
 
In urban infrastructure, gate valves are key components in intercity gas transmission pipelines, helping to regulate the flow of natural gas. They are also commonly used in tap water and sewage treatment projects, where they control the flow of water and waste efficiently. These applications highlight the versatility and importance of gate valves in essential services.

Proper Installation and Use of Gate Valves

Proper installation and use of gate valves are essential to their performance and longevity. By following specific steps during installation and routine maintenance, you can help prevent common issues like leaks or operational failures. Here are the key guidelines to follow for installing and maintaining gate valves effectively:
Inspect Valve Cavity and Sealing Surfaces
Before installing the gate valve, check that the valve cavity and sealing surfaces are clean and free from dirt or sand. This step is important for achieving a proper seal and preventing future problems. A clean surface helps maintain the valve’s effectiveness over time.
Evenly Tighten Connection Bolts
All bolts at the connection points should be tightened evenly to maintain a secure seal. Uneven tightening can lead to leaks and uneven pressure distribution across the valve. Properly tightened bolts help the valve operate smoothly and efficiently. 
Adjust Packing for Optimal Operation
The packing should be adjusted to create a good seal while allowing the valve to operate smoothly. Proper adjustment is essential for maintaining the valve’s performance. This also helps to avoid unnecessary wear on the valve components.
Verify Valve Type and Specifications
Before installation, confirm that the valve type, connection size, and flow direction match your specific application. Making sure the valve is compatible with the system ensures proper function. This step is crucial to avoid operational issues later on.
Allow Adequate Space for Operation

Ensure there is enough space around the valve for proper installation, maintenance, and repairs. Sufficient room allows easy access for adjustments and helps prevent accidental damage during operation.

Follow Wiring Instructions
When wiring the drive unit, carefully follow the circuit diagram provided by the manufacturer. Correct wiring is important for the safe and efficient operation of the valve. Proper installation also minimizes the risk of electrical issues and ensures long-term reliability.
Regular Maintenance and Protection
Perform regular maintenance on the gate valve and avoid hard impacts, especially on the sealing surfaces. Consistent care helps prevent damage and extends the valve’s lifespan. Regular checks also keep the valve in good working order.

Routine Maintenance of Gate Valves

  • Use of Bypass Valve: Before operating a gate valve equipped with a bypass valve, open the bypass valve first. This helps balance the pressure difference between the inlet and outlet, making it easier to operate.
  • Actuator Installation: Gate valves with an actuator should be installed following the guidelines in the product instruction manual. Proper installation ensures safe and efficient operation.
  • Regular Lubrication: For valves that are used frequently, lubrication should be done at least once a month. This keeps the valve in good working condition and reduces wear over time.

Troubleshooting Gate Valve Operation Issues

Regular maintenance is essential to keep gate valves functioning effectively and to extend their lifespan. By following proper maintenance practices, you can prevent common issues and keep the valve operating smoothly. Here are the key steps to follow for routine maintenance of gate valves:
Use of Bypass Valve
Before operating a gate valve that has a bypass valve, the bypass valve should be opened first. This action helps balance the pressure difference between the inlet and outlet, making the valve easier to operate. It also reduces the strain on the valve during operation.
Actuator Installation
When installing gate valves with an actuator, it’s important to follow the guidelines in the product instruction manual. Proper installation is critical for the safe and efficient functioning of the valve. Adhering to these guidelines helps avoid operational issues and prolongs the valve’s lifespan.
Regular Lubrication
For valves that are used frequently, lubrication should be performed at least once a month. Regular lubrication keeps the valve in good working condition and helps minimize wear. This maintenance practice helps the valve operate smoothly over time.

Addressing Leakage at the Stem Port

Leakage at the stem port is a common issue that can compromise the performance of a gate valve. Understanding the potential causes and knowing how to address them is crucial for maintaining the valve’s functionality. Here are the steps to take if you encounter leakage at the stem port:

Tighten Packing Bolts

If there is leakage at the stem port, it might be due to the packing not being fully tightened. To address this, carefully tighten the bolts on the gland flange until the leakage stops. This adjustment is often enough to stop the leak. Regularly checking the tightness of these bolts can help prevent future issues.

Check for Foreign Material

Foreign material inside the stem packing can also cause leaks. Inspect the area around the stem packing and remove any debris that may have accumulated. Removing these materials can restore the valve’s sealing capability. Keeping the area clean can help prevent this problem from occurring again.

Replace Damaged Stem Packing

If the stem packing is worn or damaged, it will no longer seal effectively, leading to leaks. In this situation, it’s necessary to replace the old packing with new material. Doing so will reestablish a proper seal and prevent further leakage. Regular inspection of the packing can help catch this issue early.

Addressing Seat Leakage in Gate Valves

Seat leakage in gate valves can lead to inefficiencies and operational issues. Identifying the root cause of the leakage is essential for finding the right solution. Whether the valve is manual or motorized, there are specific steps you can take to address the problem. Here are the key steps to follow when dealing with seat leakage in gate valves:
 
Reopen and Close the Manual Gate Valve
If you notice seat leakage in a manual gate valve, simply closing and reopening the valve might solve the problem. This action can help the valve reseat properly, stopping the leak. It’s a quick first step to take before exploring other potential issues.
Check Positioning on Motorized Gate Valve
For motorized gate valves, seat leakage may occur if the valve’s positioning isn’t set correctly. Verify that the valve is properly aligned with its intended setting. Adjusting the positioning can often resolve the leakage issue.
Inspect for Damage to Sealing Surfaces
Seat leakage might also be caused by damage to the gate, debris, or body seat sealing surfaces. Examine these areas for any signs of wear or damage. If damage is found, repairing or replacing the affected parts will be necessary to stop the leak.

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Additional General Insights Here

Specs of Gate Valve

Sizes

Gate Valves come in a wide range of sizes to accommodate different pipeline diameters. They typically range from 2 inches to 48 inches in diameter. Think about it. This variety allows for the specific needs of various industrial projects to be met efficiently.

Pressure Ratings

Gate Valves are rated to handle different pressure levels, ensuring they can operate safely under various conditions. The pressure rating is often specified in pounds per square inch (PSI). A standard Gate Valve could have a pressure rating of 150 PSI, suitable for general industrial applications, while higher-rated models can handle up to 2500 PSI for more demanding environments.

End Connections

The end connections of Gate Valves can vary to meet specific installation requirements. Common types include flanged, threaded, and welded connections. NTVAL offers Gate Valves with all these end connection options, providing solutions that are easy to integrate into existing systems.

Features of Gate Valve

Tight Sealing

One of the key features of Gate Valves is their ability to provide a tight seal. The gate mechanism allows for complete closure, preventing any leakage. This is crucial in applications where maintaining the integrity of the fluid flow is essential.

Full Bore Design

Gate Valves often have a full bore design, meaning the opening is as wide as the pipeline. This feature reduces pressure drops and allows for smooth flow of fluids. In other words, it is especially beneficial in applications where maintaining flow efficiency is important.

Easy Operation

Gate Valves are straightforward to operate, often requiring only a simple turn of a wheel or handle. This ease of use makes them a preferred choice in various industrial settings. Their design allows for full flow when open and minimal resistance when closed.

Benefits of Gate Valve

Efficient Flow Control

Gate Valves provide efficient flow control, allowing for precise regulation of fluid movement. Their design minimizes pressure drop and turbulence, ensuring smooth operation. This efficiency makes them ideal for applications where consistent fluid flow is necessary.

Cost-Effective

Gate Valves are a cost-effective solution for controlling fluid flow in pipelines. Their durability means they have a long service life, reducing maintenance and replacement costs. NTVAL Gate Valves offer an economical choice without compromising quality.

Versatility

Gate Valves are versatile and can be used in a wide range of applications, from water supply systems to oil and gas pipelines. Their ability to handle different types of fluids and withstand harsh conditions makes them suitable for various industries. This versatility means they can be employed in multiple projects, providing flexibility for different needs.

Applications of Gate Valve

Water Supply Systems

Gate Valves are widely used in water supply systems to control the flow of water. They can be found in residential, commercial, and industrial plumbing systems. Turns out, their ability to provide a tight seal means that water flow can be easily started or stopped without leaks.

Oil and Gas Pipelines

Gate Valves play a crucial role in oil and gas pipelines. They are used to control the flow of crude oil, natural gas, and other petroleum products. NTVAL Gate Valves are designed to withstand the high pressure and corrosive environments typical in the oil and gas industry, ensuring reliable and safe operation.

Chemical Processing

In chemical processing plants, Gate Valves are essential for controlling the flow of various chemicals. They are used in processes that require precise regulation of fluids to maintain safety and efficiency. The robust construction of Gate Valves makes them suitable for handling aggressive and corrosive chemicals.

Petrochemical Industry

Gate Valves are critical in the petrochemical industry for managing the flow of chemicals, gases, and other fluids. Their ability to handle high pressures and corrosive substances makes them ideal for refining and chemical plants. These valves provide reliable control, helping maintain safety in complex petrochemical processes.
Gate Valve 27
Gate Valve 28

3 Considerations When Buying Gate Valve

01

Operational Mechanism


Consider how the Gate Valve will be operated, whether manually, electrically, or pneumatically. Manual valves are simple and cost-effective for smaller systems. For larger or more complex systems, electric or pneumatic actuators provide automated control. For example, an oil refinery might use pneumatic actuators for quick and precise valve operations. This choice can greatly enhance efficiency and reduce manual labor in demanding environments.

02

Temperature Tolerance

Consider the temperature range the Gate Valve needs to withstand. High-temperature applications, such as steam systems, require valves made from materials that can endure extreme heat without deforming or failing. Conversely, low-temperature applications may need materials that remain resilient in cold conditions. Matching the valve to the temperature requirements of the system is crucial for long-term performance.

03

Maintenance Requirements

Evaluate the maintenance requirements of the Gate Valve. Some valves are designed for easy maintenance, with replaceable parts and accessible components, while others may require more complex servicing. Choosing a valve with low maintenance needs can reduce downtime and operational costs. NTVAL offers Gate Valves with features that facilitate easy maintenance, reducing downtime and providing continuous operation.

Types of Gate Valve

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