Featured products

  • Cast Iron Double Disc Swing Check Valve

    Cast Iron Double Disc Swing Check Valve

    Product Video Product Description The function of the dual plates check valve is to only allow the medium to flow in one direction and prevent the flow in one direction. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. Structural Features of Wafer ...

  • Cast Iron Single Disc Swing Check Valve

    Cast Iron Single Disc Swing Check Valve

    Product Video Product Description Single disc check valve is also called single plate check valve, it is a valve that can automatically prevent fluid back flow. The disc of the check valve is opened under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve flap is automatically closed under the action of the fluid pressure difference, its own gravity and other factors to ...

  • Iron Flanged Ball Valve

    Iron Flanged Ball Valve

    Product Video Product Description Specifications: Cast iron ball valve : Min Temperature : -20°C Cast iron ball valve : Max Temperature :+ 120°C Max Pressure : 16 Bars Specifications : Full bore Hollow stainless ball from DN 50 to DN 200 Ends : EN 1092-2 Flanges Materials : Body: Cast iron body – Cast iron EN GJL-250 Sphere: Stainless Sphere – SS 304 Stem seal with PTFE ring and O-ring EPDM Axis blow-out proof full bore With spacing DIN 3202 Product Parameter   NO. Part Material 1 Bo...

  • Non-Rising Stem Diaphragm Valve

    Non-Rising Stem Diaphragm Valve

    Product Video Product Description Diaphragm Valves have two kinds of types, wire and full flow, which use a ‘pinching’ method to stop the valve flow using a flexible diaphragm.These types of valves are generally not suited for very high-temperature fluids and are mainly used on liquid systems. Our corporation puts emphasis about the administration, the introduction of talented staff, plus the construction of team building, attempting hard to improve the quality and liability consciousness of ...

  • Wafer Silent Check Valve

    Wafer Silent Check Valve

    Product Video Product Description The silent check valves with a cast iron body, use a fully automatic spring assisted discs to eliminate water hammer while preventing flow reversal in the piping. The spring closure acts faster than that swing check valves, which can slam shut with the flow reversal. The wafer type body design is compact, versatile, and fits inside of the bolting in a flanged connection. For 2″ to 10″ diameters, the 125# wafer design allows for mating to either 12...

  • Flanged Silent Check Valve

    Flanged Silent Check Valve

    Product Video Product Description Cast Iron Flanged Silent Check Valve provides great sealing capacities for high and low pressure. In particular, industrial and HVAC applications, water, heating, air conditioning and compressed air devices are included. This cast iron flanged silent check valve comes in a body of Cast Iron, epoxy-coated, EPDM seat and Stainless Steel spring. These components make it an economical, secure Standard or Foot Check valve. The valve becomes a fully operational Foo...

  • Threaded Ball Check Valve

    Threaded Ball Check Valve

    Product Video Product Description The threaded ball check valve is widely used in wastewater, dirty water or high-concentration suspended solid water pipelines. Obviously, it can also be applied to drinking water pressurized pipelines. The temperature of the medium is 0~80℃. It is designed with very low load loss due to total passage and impossible obstacles. It is also a waterproof and maintenance-free valve. Ductile Iron, epoxy-coated body and bonnet, NBR/EPDM seat and NBR/EPDM-coated alum...

  • Flanged Ball Check Valve

    Flanged Ball Check Valve

    Product Video Product Description Ball Check Valve –Ball check valve is a kind of check valve with multi-ball, multi-channel, multi-cone inverted flow structure, mainly composed of front and rear valve bodies, rubber balls, cones, etc. The ball check valve uses a rubber-covered rolling ball as the valve disc. Under the action of the medium, it can roll up and down on the integral slide of the valve body to open or close the valve, with good sealing performance and noise reduction The city is ...

About Us

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Brief description:

Laizhou Dongsheng Valve Co., Ltd. is a professional valve plant, is a collection of research and development, design, the manufacture, the sale of integrated specialized company since 2002. We hold a set of scientific and strict management system, strong technical force, advanced processing equipment and reasonable technical progress, high technology and quality technicians and workers. Our factory area is 30,000 square meter and have 148 employees. After 20 years of focus, we have developed into a world-renowned check valve production base, and our products are exported to Europe, America, Africa, Southeast Asia, Australia and other more than 70 countries and regions.

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    Types of Check Valves

    Check valve, also known as one-way valve or check valve, belongs to the automatic valve category, and its function is to prevent the backflow of the medium in the pipeline. The bottom valve used for pump suction is also a type of check valve. The disc of the check valve is opened under the action...

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    The working principle and advantages and disadvantages of ball check valve

    1. What is the working principle of the ball check valve? Spherical check valve is a check valve with multi-ball, multi-flow channel and multi-cone inverted fluid structure. It is mainly composed of front and rear valve bodies, rubber balls, cone-shaped bodies, etc. Its valve disc is a rubber-cov...

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    Application of butterfly valve and gate valve under different working conditions

    Gate valve and butterfly valve both play the role of switching and regulating flow in pipeline use. But there are methods in the selection process of butterfly valves and gate valves.     In the water supply network, in order to reduce the depth of the soil covering of the pipeline, the butterfly...

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    Where should the check valve be installed?

    Today we will discuss the check valve installation location. So how to determine the installation position of the check valve? What is the difference between installing a check valve before the pump and installing it after the pump? Where is the installation in front of the pump suitable for? Che...

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    Sealing principle and structural characteristics of butterfly check valve

    The sealing principle of butterfly check valve: The structure of the butterfly check valve is similar to that of a butterfly valve, and its sealing principle is similar to that of a butterfly valve. There are two types of butterfly check valves, one is single plate and the other is double plate. ...

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    How to choose stainless steel wafer check valve?

    Stainless steel wafer check valve is an automatic valve with many models and specifications. This type of product is mainly used to prevent the backflow of the medium, the reverse rotation of the pump and its driving motor, and the discharge of the medium in the container. It can be applied to va...