Question 1

What is a check valve and what does it do?

Accepted Answer

A check valve allows flow in one direction only, automatically preventing backflow. When flow stops or reverses, the disc closes against the seat to prevent return flow. They are passive devices with no manual operation required.

Question 2

What types of check valves do you manufacture?

Accepted Answer

Swing check valves (API 594), Lift check valves (spring-loaded or weight-loaded), Piston check valves, Double disc check valves, Non-slam check valves (for preventing water hammer), and Wafer check valves. Full API 594, API 600, and ASME B16.34 compliance.

Question 3

What is the difference between swing check and lift check?

Accepted Answer

Swing check: disc swings on a hinge away from the seat when flow is forward, and closes by gravity when flow stops. Suitable for low-velocity applications. Lift check: disc lifts vertically like a globe valve disc, allowing flow above it when pressure pushes it up. Better for higher velocities and where water hammer is a concern.

Question 4

What is API 594 check valve?

Accepted Answer

API 594 covers wafer-style check valves (swing check and lift check) for petroleum, chemical, and other process industries. These are lightweight wafer-style designs that fit between flanges. They are tested to API 598 and meet face-to-face dimensions of API 6D.

Check Valve Manufacturer
& Exporter from India

Check Valve Types We Manufacture

Swing Check Valve

Lift Check Valve

Wafer Check Valve

Non-Slam Check Valve

Double Disc Check Valve

NAB Seawater Check Valve ⭐

Check Valve Specifications

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Check Valve Manufacturer & Exporter from India