Check Valve

FLOWORK Check Valves are in various types, sizes and pressure to be applied to different sectors. Our valves are in high quality and are highly preferred by customers, complying with the strictest international standards involving API 602, API 6D, API 594, API-Q1, CE, ISO 9001, ISO 45001, ISO 14001, etc. We can also produce customized check valves to meet specific industrial requirements.

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Our Check Valve Superiority

API/CE/ISO certified

FLOWORK is accredited by renowned global organizations and certified by strict international standards involving API 600, API 6D, API-Q1, API 607, API 6FA, CE, ISO 9001, ISO 45001, ISO 14001, ISO 15848-1, etc.

Approved by test institutions

FLOWORK check valves are tested in compliance with the requirements of the strictest test organizations (TUV, SGS, ABS, DNV, etc.).

Other advantages

Some items of check valves are in stock, so we can deliver prompt and meet customers’ urgent needs.
Effectively prevent medium backflow; occupy little space.

Check Valve selection FAQ

For check valves, what kind of material do you produce?

We mainly produce carbon steel (WCB, LCB, A105, LF2, etc.), alloy steel (WC6, WC9, C5, F11, F22, F5, etc.), stainless steel (CF8, CF8M, 4A, 5A, F304, F316, F51, F53, etc.), bronze (C95800, C95500, C83600, etc.).

Could you provide certificate of material?

Yes, we can provide a material report EN 10204 3.1 certificate after the valve is completed.

Could you provide test bars for chemical analysis, impact test and other tests?

Yes, as long as the customer requests the test bars, we will prepare it during production.

Could you provide material selection service?

We are only responsible for the material and valve pressure rating specified on the order. Customers should choose suitable materials and pressure grades according to working temperature, working pressure and working medium.

How long is your warranty period?

Our warranty is 12 months after the valves leave the factory.

Could you repair or replace defective goods for free?

ODuring the warranty period, we will provide repair services or spare parts for damage caused by material or manufacturing process problems free of charge, excluding man-made damage.

Can you provide installation service?

We can provide installation and operation manuals.

What is the design standard of the check valve?

The design standard of swing check valve is BS 1868/API 6D, the design standard of wafer check valve is API 594, and the design standard of forged check valve is API 602.

What types of check valves do you have?

We have swing check valve, lift check valve/piston check valve, wafer check valve, lug type check valve, axial flow check valve/nozzle check valve/non slam check valve, tilting check valve, etc.

Does the check valve have a soft seal design?

The check valve designed by BS1868/API6D/API602 has only metal-to-metal seat design, but the wafer check valve designed by API594 has metal-to-metal seat sealing design and soft sealing design.

Do you have retainerless wafer check valves? What are its advantages?

Wafer dual plate check valve is divided into common type and retainerless type. The retainerless type is better than the common type. The retainerless type not easy to fall off, not easy to leak.

Are your check valves zero leakage?

The metal-sealed check valve meets the leakage standard of API598, and the soft-sealed check valve can achieve zero leakage.

Are check valves fireproof?

Metal sealed check valves are fireproof; soft sealed check valves are not.

Are check valves bidirectional?

No, the check valve is unidirectional.

Do all check valves use springs?

Only the wafer check valve and the lift check valve have a spring, and the swing check valve does not have a spring.

What are the types of bonnets for check valves?

We have bolted bonnet, pressure self-sealing bonnet, welded bonnet, thread bonnet and union bonnet.

Do your check valves have lifting rings?

There is no lifting ring design for the 1/2"-3" small size check valves, and there is a lifting ring design for the large size check valves.

What are the design standards for check valves?

Design standard: BS 1868/API 6D/API 594/API 602
Face to face standard: ASME B16.10
Flange standard: ASME B16.5/ EN1092-1/ASME B16.47 A/ASME B16.47 B
BW standard: ASME B16.25
NPT standard: ASME B1.20.1
Pressure-temperature ratings: ASME B16.34
Pressure test: API 598/API 6D

Can you make custom production on request?

We have check valves in BS1868 and AIP594 designs, we can customize on the original valve body according to customer's requirements.

What is the leak rating of your check valve?

Our soft-sealed wafer check valves can achieve zero leakage.
Our hard-sealed check valves are factory pressure tested for zero leakage.
According to the standard, the leakage class of the hard seal check valve is Class D.

Do you have check valves in stock?

Our BS1868 designed WCB material swing check valves are available in stock.
Stock valve size range are 150LB: 2”~12”, 300LB: 2”~10”, 600LB: 2”~8”

What is the maximum pressure your check valve can reach?

We can produce check valves with 150LB~2500LB pressure.

Do you have any MOQ limit for valve order?

For small size we have MOQ limit. For big size, 1 piece is okay.

What is your delivery time?

Generally it is 5-10 working days if the goods are in stock. And it is 30-35 working days if produce new ones, it is according to quantity requirement.

Can the check valve be installed vertically or horizontally?

The swing check valve can be installed horizontally or vertically, and the lift check valve is recommended to be installed horizontally.

How to install a wafer check valve?

When placing the pipeline, pay attention to the passing direction of the wafer check valve in the same direction as the fluid flow; install it in the pipeline that is placed vertically.

What is a check valve?

Check valve refers to a valve whose opening and closing part is a circular disc and acts by its own weight and medium pressure to block the backflow of the medium.

Can you provide ITP?

After receiving the order, we can provide ITP.

Can you provide mating flanges?

We can provide mating flanges upon request.


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Address: 3100 SMITH ST HOUSTON TX, USA 77006


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