What is Elastic Seated Seal Gate Valve
Resilient-seated gate valves (also known as soft-seal gate valves) achieve sealing through the tight fit between the gate and a resilient sealing seat (such as rubber or PTFE composite material). The resilient sealing seat has a certain deformation capacity, which can compensate for minor errors in the gate or valve body, significantly reducing the risk of leakage. It combines the advantages of low flow resistance and smooth opening and closing of gate valves with excellent sealing performance, making it suitable for low-pressure industrial and civil applications with stringent leakage requirements. It complies with GB/T 13927 valve pressure test and CJ/T 216 resilient-seated gate valve standards, and is widely used in water supply and drainage, HVAC, fire protection, and municipal engineering fields, such as domestic water pipelines, heating systems, and fire protection network control.
Resilient-seated gate valve structural features:
Sealing structure:
Uses a wedge or parallel sealing surface configuration. The valve seat contains an elastic material (such as rubber or PTFE) to form a tight seal with the valve disc.
Some models use a triple O-ring seal structure to reduce the risk of leakage, and the sealing ring can be replaced under pressure (but caution is required). Valve Body and Stem:
The valve body is primarily made of ductile iron or cast steel, with an epoxy resin coating to prevent corrosion.
The stem is made of stainless steel (e.g., 2CR13), with a trapezoidal thread extrusion forming process, resulting in high surface hardness and a low coefficient of friction.
Gate Design:
The gate is covered with rubber (e.g., NBR or EPDM), typically no less than 2mm thick, with a sealing surface thickness of 6–9mm and a sealing compression ratio controlled between 15% and 25%.
The resilient gate can deform slightly to compensate for sealing surface angle deviations, improving sealing performance.
Actuating Mechanism:
The rising stem structure converts rotary motion into linear motion through the engagement of a nut at the top of the stem and a guide groove.
The non-rising stem structure uses stem rotation to raise and lower the gate, suitable for space-constrained applications.
Performance Advantages of Resilient Seated Gate Valves
Reliable Sealing:
The resilient sealing design adapts to high-pressure, high-temperature, and high-viscosity media, effectively preventing leakage.
Flat-bottomed valve seat design reduces fluid resistance, prevents debris accumulation, and ensures a clean sealing surface.
Smooth opening and closing:
The trapezoidal thread on the valve stem mates with the nut, resulting in low operating torque and effortless opening and closing.
The maximum opening and closing torque is limited to 240 N·m, suitable for manual operation.
High corrosion resistance:
The valve body is coated internally and externally with non-toxic epoxy resin, providing excellent corrosion resistance and making it suitable for wastewater systems.
The rubber material meets hygiene standards and is suitable for the food, pharmaceutical, and other industries.
Easy maintenance:
The gate and valve stem nut connection uses a T-nut type or an integral embedded structure for easy disassembly and replacement.
The valve shaft packing has a long design life; some models can last a lifetime or more than ten years without replacement.
Application Areas
Resilient seated gate valves are widely used in the following industries:
Water and sewage treatment: The flat-bottomed valve seat design prevents debris accumulation and ensures water quality safety.
Petrochemical industry: High pressure and high temperature resistance adapts to harsh working conditions.
Power and Metallurgy: Reliable sealing performance ensures stable system operation.
Building and Fire Protection: Lightweight design (20%–30% weight reduction compared to traditional valves) facilitates high-altitude installation.
Selection and Installation Considerations
Specification Matching:
The nominal diameter (DN) must meet the pipeline design requirements, and the pressure rating (e.g., 1.0–2.5 MPa) should be greater than the actual working pressure of the pipeline.
Material Selection:
Select the valve body material (e.g., ductile iron, cast steel, or stainless steel) according to the characteristics of the medium.
The sealing surface material must be suitable for the temperature and chemical properties of the medium (e.g., EPDM rubber has excellent aging resistance).
Installation Requirements:
For rising stem valves, the valve stem must be kept vertical, with 0.5–1 turn of reverse rotation allowed in the fully open position to prevent thermal expansion and locking.
For non-rising stem valves, the operating end should be a standardized square tenon, facing the ground for easy operation.
Lightweight sealing plates should be installed on both sides of the valve for secure sealing. Medium and small diameter valves should be bound with straw rope, and large diameter valves should be packaged with a wooden frame.
Operation and Maintenance:
The valve opens and closes clockwise, with the rotation speed controlled between 200 and 600 revolutions per minute.
Regularly check the wear of the valve shaft packing and sealing surfaces, and replace worn parts promptly.
Elastic Seated Seal Gate Valve in stock
