Non Slam Check Valve

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Check valves are mechanical valves that permit gases and liquids to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while backflow closes the valve. The mechanics of check valve operation are not complicated. Most check valves contain a ball that sits freely above the seat, which has only one through hole. The ball has a slightly larger diameter than that of the through hole. When the pressure behind the seat exceeds that above the ball, liquid is allowed to flow through the valve. Once the pressure above the ball exceeds the pressure below the seat, the ball returns to rest in the seat, forming a seal that prevents backflow. We manufacture check valves in conformity with ASME B16.34 standards. All valves are tested according to API 589 requirements. The marking is as per MSS SP-25 standards.

Product Range:
Size: 1/2" - 48" ?DN15 - DN1200?
Class: 150LB - 2500LB (PN16 - PN420)
Temperature: -29ºC - 425ºC
Material: A105, LF2, F11, F22, F304, F316, F304L, F316L
Connection: socket welding or inner screwed
Actuator: Hand wheel
Application: Oil and gas pipeline
Drainage system
Chemical Plant

Dimensional accuracy
High tensile strength
Longer service life
High efficiency url:

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Offered by
Zhejiang Naibang Valve Co., Ltd

Wenzhou (China)


Manufacturers, Trader & Exporter/Importer



About Company

Zhejiang Naibang Valve CO., LTD, is located in the hometown of pump valve - Oubei Town Wenzhou City Zhejiang Province.Founded in 2000, is a professional valve manufacturer integrating design, technical development, produce and sale service, has a solid strength and rich production experience. Over the years,our enterprise is always adopting others' strong points, keeping innovation, exploitation, insisting on quality first and sincere principle as enterprise tenet, manufacturing high quality products with an utmost fast speed, satisfying the requirement of national and oversea clients for high technology. Nowadays, our company is manufacturing many kinds of valves such as API, ANSI(USA), BS(Britain), DIN(German), JIS, JPI(Japan), GB, JB(China), and various nonstandard products which are widely used in oil, oil refining, chemical industry, power plant, boiler, metallurgy, electric power They have good market in all around the world and they are well received by customers. In recent years, the products are exported to the United States, France, Italy, Malaysia, India, Nigeria, Spain and other countries around the world, has been widely used in oil, oil refining, chemical industry, power plant, boiler, metallurgy, electric power and other industries both at home and abroad , well received by customers. The company has many sets of excellent mechanical processing equipments and modernized inspection & testing equipments used for our main products: ball valve, check valve, forged valves, gate valve, globe valve, butterfly valve, strainer and so on. Nominal size (NPS):1/2"-60"(DN15~-DN1500); Nominal pressure (Class): 150Lb-2500Lb(PN1.0Mpa~PN42.0Mpa); Working temperature: -101?- 680?, Main material include carbon steel,SS304,SS304L,SS316,SS316L,low temperature steel,dual phase steel(F51/F55),aluminium bronze,titanium alloy,Inconel,20# alloy,chrome alloy, etc. In order to provide customer high-quality and better service, the company has equipped the system certification such as API6D, CE, ISO9001, TS, ect. Our persistent management tenet is based on continuous exploitation,strict quality control,favorable price and complete service.Sincerely welcome to vast new and old clients to visit and cooperate with a view to commonly developing a brilliant tomorrow.. view more »

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