The Ultimate Buyer's Guide for Purchasing DIN resilient seated gate valve manufacturer

Sep. 08, 2025

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Gate and Check Valves: Clear Comparison Guide

Working Principle

Gate Valve:
Operates using external power (manual handwheel rotation or actuator) to vertically raise/lower the gate (wedge or parallel type) via the stem, achieving full flow passage opening/closing.

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Check Valve:
Fully automatic operation relying on fluid pressure differential - valve disc opens under forward flow pressure and self-closes against reverse flow.

Structural Features

Gate Valve:
The structure is relatively complex, consisting of a valve body, gate, stem, and handwheel. Its straight-through flow path offers minimal resistance when fully open, making it ideal for high-flow applications. However, prolonged friction between the gate and seat seals can cause wear, requiring periodic replacement of sealing components.

Check Valve:
The design is simpler, with key components including the valve body, disc, and spring (in some types). Common variants include lift-type, swing-type, and butterfly-type check valves. For example:
Swing check valves use a hinged disc that pivots open, suitable for horizontal installation.
Lift check valves rely on vertical disc movement, typically used in vertical pipelines.
Their sealing performance depends heavily on medium pressure, ensuring zero leakage when flow reverses.

Installation Position

The gate valve can be installed in any direction without any restrictions and can be used in both directions. It is commonly used in the following scenarios:

Pump outlets: For fluid cutoff during maintenance
Pipeline branches: To isolate different sections
High-temperature and high-pressure systems: Such as power plant steam pipelines, withstanding pressures over 10MPa

Check valves must be installed according to the medium flow direction (as marked by the arrow on the valve body). Typical applications include:

Pump and compressor outlets: To prevent equipment damage from backflow during shutdown
Container discharge ports: To avoid material mixing risks caused by reverse flow
Fire protection pipelines: To ensure unidirectional water supply and improve system reliability

Advantages and Disadvantages Comparison

Gate valves:
Advantages:

Extremely low pressure loss when fully open
Bidirectional sealing with no flow direction restrictions
Suitable for high-pressure and high-temperature media

Disadvantages:

Slow opening/closing speed, prone to water hammer
Sealing surfaces wear easily, resulting in high maintenance costs
Large dimensions and opening height require more installation space

Check valves:
Advantages:

Automatic backflow prevention with high safety
Simple structure and easy maintenance

Disadvantages:

May cause water hammer impact during reverse flow
Frequent opening/closing can damage the disc or spring

Classic Combination of Gate Valves and Check Valves

In pump outlet pipelines, a check valve is typically installed first, followed by an isolation valve (gate valve or butterfly valve).

Maintenance convenience: After closing the isolation valve, the check valve can be removed separately for maintenance without draining the entire pipeline system.
Water hammer protection: Installing the check valve near the pump outlet allows faster response to pressure fluctuations during pump shutdown, reducing water hammer impact on the pump.
System reliability: Positioning the isolation valve downstream of the check valve prevents check valve failure caused by accidental closure of the isolation valve.

Flexible Adjustments for Special Scenarios

While the "check valve first, gate valve second" principle is generally applicable, the following situations require sequence adjustments:
High-pressure steam pipelines: To protect costly high-pressure gate valves, they may be installed upstream of check valves to bear the initial media impact.
Parallel pump header systems: Each pump outlet should have a dedicated gate valve to prevent backflow through check valves during maintenance.
Space-constrained pipelines: Layouts may be adapted to spatial requirements, but must be validated through hydraulic calculations for safety.

Gate valves and check valves serve distinct yet often collaborative functions. Understanding their core differences - while considering operational pressure, media characteristics, and maintenance needs - is essential for building efficient and reliable piping systems.

Thank you for reading. If you're seeking ideal check valves or gate valves, consider Union Valve. As professional valve manufacturers, we offer customizable designs to meet exact specifications. For further inquiries, please contact us.

Resilient Sealed vs. Metal Sealed Gate Valves: A Comparison

Introduction: Resilient sealing refers to the sealing between metal and non-metal materials, while metal sealing is the sealing between metal and metal. Metal sealing involves precision machining of the sealing surface to ensure the fit with the valve core (ball), typically using materials such as stainless steel and copper. Resilient sealing means that the sealing material embedded in the valve seat is non-metallic. Because Resilient sealing materials have a certain elasticity, the precision requirements for machining are relatively lower compared to metal sealing.

Gate Valve: A gate valve is a type of valve where the closing element (gate) moves in a vertical direction along the centerline of the passage. Gate valves can only be used for fully open or fully closed cut-off in pipelines, they cannot be used for regulation or throttling.

Gate valves are classified into Resilient sealing gate valves and metal sealing gate valves based on their sealing structures. In this article, I will explain the characteristics of resilient seated gate valves and their differences from metal sealing gate valves. I hope this will help you gain more insight into the practical applications of resilient sealing gate valves and determine which type of gate valve is more suitable for your needs.

Resilient sealing gate valves and metal sealing gate valves are two main categories within the gate valve series, featuring different sealing structures. Both types operate on the same principle and are used to cut off fluid flow. Metal sealing and resilient sealing can sometimes complement each other, while at other times, they function independently.

What Is Resilient Seated Gate Valve

The resilient seated gate valve also known as the soft sealing gate valve, is a manually operated valve used in hydraulic engineering to connect and disconnect the medium in pipelines. The construction of a resilient seated gate valve consists of a valve seat, valve cover, gate, gland, valve stem, handwheel, sealing gasket, and hexagonal bolts. The internal passage and external surface of the valve are coated with electrostatic powder, followed by high-temperature baking. This process ensures the smoothness of the entire passage and the internal wedge grooves of the gate valve, while also providing a visually appealing color finish. For general hydraulic applications, resilient seated gate valvea are typically coated in blue with a high gloss finish, while for fire protection pipelines, they are usually coated in red with a high gloss finish.

Main Features of Resilient Seated Gate Valve

Valve Body:

The body of the resilient seated gate valve is mainly made of ductile cast iron. The gate and the sealing ring are made of EPDM or NBR rubber. Sealing is achieved by the elastic deformation of the rubber on the gate's sealing surface when closed. These valves are corrosion-resistant, offer excellent sealing properties, and can achieve zero leakage. The gate is wedge-shaped, which reduces wear on the valve plate's sealing surface.

The resilient seated gate valve has no grooves at the bottom of its valve body, allowing fine particles in the medium to pass through with the flow without accumulating impurities. The inner diameter of the flow passage at the valve seat is equal to the pipeline's inner diameter, matching the nominal size. This design results in almost no flow resistance.

Coating

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The resilient seated gate valve utilizes epoxy resin powder electrostatic spraying for its coating. Once cured, the coating does not dissolve in water and does not affect water quality. Epoxy resin powder coating is a solid, ultra-fine powder in a dry state. During application, an electrostatic spray gun, driven by compressed air, causes the charged coating particles to adhere to the valve body's surface. The valve body is then baked in an oven at temperatures between 180° and 200°C, causing the coating to melt and form a layer on the valve body's surface.

Epoxy powder coatings offer the following advantages: they have low melting viscosity, resulting in a smooth and even coating film, and they adhere very well to metal substrates, eliminating the need for a primer. The coating film has high hardness, excellent scratch resistance, good impact strength, and overall good mechanical properties. Additionally, the coating film is resistant to water, acids, alkalis, and saltwater.

Valve Stem Sealing

The gate valve stem is sealed using three O-rings. The third O-ring reduces pressure at the gland, effectively preventing external leakage at the valve stem. Compared to the packing structure, the O-ring sealing structure can effectively reduce the valve's opening and closing torque. Additionally, a dust ring is installed at the top to prevent dust and impurities from entering. The O-rings can be replaced under pressure while the valve is online.

Gate Sealing

Gate sealing primarily comes in two types: parallel (cut-off) and wedge. The parallel type is more commonly used in sizes above DN250. Its characteristic is that the rubber on the sides of the gate does not perform a sealing function during closure, the rubber on the sides of the gate does not deform by being compressed against the valve body’s inner wall during closing. Only upon final closure does the rubber deform to create a seal. This design requires less torque during the closing process but demands high manufacturing standards, especially regarding the casting process of the valve body’s sealing surface, requiring high dimensional accuracy and smoothness.

The wedge type is more commonly used in sizes below DN200. In this design, the rubber on the sides of the gate provides the sealing function. During closing, the rubber on the sides of the gate is compressed and deformed against the valve body’s inner wall, forming a sealing surface. This design requires more torque during the opening and closing process compared to the same size valves with a parallel type design. However, it has relatively lower casting requirements for the valve body. In practice, there is no significant difference between the two structures in terms of usage.

The Difference Between Resilient Gate Valve And Metal-Sealing Gate Valve

Let’s take a look at the differences between resilient seated gate valve and metal sealing gate valves:

1.Resilient Seated Gate Valve:The gate is lined with resilient rubber, and the internal structure is wedge-shaped. When the handwheel mechanism at the top is turned, the spindle lowers, pressing the resilient gate against the internal wedge groove, creating a tight seal due to the rubber's ability to compress and expand. The design of resilient sealing gate valves is straightforward, making them easy to disassemble and install. Maintenance is typically simple, requiring only the replacement of the gate, making it convenient to repair.

Metal Sealing Gate Valves:The sealing surfaces of the valve body and gate are made from the same material, such as copper alloy or stainless steel. When these surfaces wear out, both the valve body and gate require simultaneous maintenance, which is more complex.

2.Resilient Seated Gate Valves: The valve body is designed without grooves, which prevents the accumulation of impurities.

Metal Sealing Gate Valves: Due to the sealing surfaces on both sides of the valve body, there are grooves at the bottom of the valve body. Over time, impurities can accumulate in these grooves, blocking the gate's descent and causing sealing failure.

3.Resilient Seated Gate Valves:The valve body is coated with epoxy resin, which is corrosion-resistant and non-polluting, making it suitable for use in drinking water pipelines.

Metal Sealing Gate Valves: These typically use paint for coating, which can slightly pollute water. However, modern hard sealing gate valves for drinking water pipelines also use epoxy resin coating.

4.Resilient Seated Gate Valves:The valve cover uses hexagon socket screws, which are sealed with wax after tightening to prevent rust between the screws and the valve body, facilitating future disassembly and maintenance.

Metal Sealing Gate Valves: These usually use hexagon bolts, but some models also employ a similar hexagon socket screw structure.

5.Applicable Medium Temperature Differences:

Resilient Seated Gate Valves: The sealing material has limited temperature resistance, making it suitable for low-temperature environments. It tends to fail under high temperatures and has poor wear resistance, making it less suitable for mediums containing solid particles. It also has a relatively narrow pressure range, potentially affecting sealing performance in high-pressure environments.

Metal Sealing Gate Valves: The sealing material is usually metal, such as stainless steel or hard alloys, which are suitable for high-temperature and high-pressure conditions, maintaining good sealing performance and stability. The metal sealing surface is wear-resistant, enduring medium erosion and wear, thus offering a longer service life. These valves are suitable for mediums with solid particles or strong corrosiveness

When choosing between resilient seated gate valves and metal sealing gate valves, it is essential to understand the medium's characteristics, temperature, pressure, and operating conditions. Resilient seated gate valves are more suitable for applications requiring high sealing performance, clean medium, and frequent operation. In contrast, metal sealing gate valves are better suited for harsh conditions involving high temperature, high pressure, and mediums with many impurities. Combining this information with the content of the article allows for a comprehensive evaluation, ensuring a more accurate selection and worry-free valve operation.

Union Valves is a professional Chinese gate valve manufacturer, with products certified by ISO:, CE, WRAS, ACS, EAC, TUV, and SGS, offering various types and specifications. For more information, please contact us as soon as possible.

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