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. |
size: | 2”-72” |
pressure: | ≤7500psi |
Material selection: | 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 |
weight: | ≤3Ton |
process: | Resin sand casting, etc. |
Wenzhou Longzhu Industrial Co.，Ltd Sales manager： Mrs.peng E-mail: sylvia@china-longzhu.com Tel： 0086-0577-86621768 Fax： 0086-0577-86621935 Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,China |
Check Valves The purpose of this type of valve is to allow only the medium to flow in one direction and to prevent flow in the opposite direction. Usually, the valve is automatically operated, and the valve flap is opened by the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat to cut off the flow.
The selection criteria for the check valve are as follows:
1. In order to prevent backflow of the medium, a check valve should be installed on the equipment, equipment and pipelines;
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.
Service Flow
1. Help customer to design, making drawing;
2. Providing free samples + dimension inspection report + material report...;
3. Checking raw material, and inform customer before mass production;
4. Informing customer production schedule weekly;
5. Arrange shipment, and Inform customer in advance 7 days before finishing the order;
6. Before shipment, send the detailed product pictures, dimension inspection report, material report to customer;
7. Welcome customer inspection and the third party inspection;
8. Expressing original document;
9. Contact us for more information.
