With more than 30 years of casting history, Wenzhou Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. We can produce castings of various sizes, shapes and materials according to the drawings provided by customers, especially in the field of valve castings. Cooperate with Fortune 500 companies for many years.
GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15，CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB Cr26.4A
Resin sand casting, etc.
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The check valve belongs to this type of valve, which includes a swing check valve and a lift check valve. The swing check valve has a hinge mechanism and a door-like flap that rests freely against the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface each time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swinging space and the valve flap is truly and comprehensively in contact with the valve seat. The flaps can all be made of metal, or they can be inlaid with leather, rubber, or synthetic coverings depending on the performance requirements. With the swing-open check valve fully open, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small.
The selection criteria for the check valve are as follows:
1. The swing-type check valve should not be made into a small-diameter valve, which can be made into a high working pressure. The nominal pressure can reach 42 MPa, and the nominal diameter can also be made very large, and the maximum can reach 2000 mm or more. Any working medium and any operating temperature range can be applied depending on the material of the housing and the seal. The medium is water, steam, gas, corrosive medium, oil, medicine, and the like. The working temperature range of the medium is between -196 and 800 °C;
2. The rotary check valve is suitable for low pressure and large diameter, and the installation is limited;
3. The installation position of the butterfly check valve is not limited. It can be installed on the horizontal pipeline or on the vertical or inclined pipeline;
4. Diaphragm check valve is suitable for pipelines that are prone to water hammer. The diaphragm can well eliminate the water hammer generated when the medium is reversed. It is generally used on low pressure normal temperature pipelines, especially for tap water pipelines. The temperature is between -12--120 °C, the working pressure is <1.6 MPa, but the diaphragm type check valve can achieve a larger diameter, and the DN can reach 2000 mm or more.