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 can also be used to supply a line in which the pressure may rise to an auxiliary system that exceeds the system pressure. The check valve can be mainly divided into a swing type check valve (rotation according to the center of gravity) and a lift check valve (moving along the axis).
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. Check valve is generally suitable for clean media, not suitable for media containing solid particles and viscosity;
3. Generally, horizontal lift check valves should be used on horizontal pipes with a nominal diameter of 50 mm;
4. Straight-flow lifting check valves can only be installed in horizontal pipes;
5. For the inlet pipe of the pump, the bottom valve should be selected. The bottom valve is generally installed only on the vertical pipe of the pump inlet, and the medium flows from bottom to top
Materials of Valve Casting Parts are as following:
Carbon Steel (mainy for high pressure valve castings): WCA, WCB, ZG25, ZG200-350, ASTM A216 WCA/ WCB/ WCC, GS25.
Stainless Steel: SS304, SS316, PH17-4, ASTM A351 CF8/ CF8M/ CF3/ CF3M, ZG0Cr18Ni9, zg0Cr18Ni12Mo2, ZG00Cr18Ni10.
Gray Iron: HT200, HT250, HT300, HT350,GG15, GG20, GG30, FC200, FC250, FC300, ASTM A48 CLASS NO.20, NO.25, NO.30, NO.35.
Ductile Iron: QT400-18, QT500-7, QT600-3, GGG40, GGG50, GGG60, FCD450-70, FCD400-15, FCD500-7, FCD600-3, ASTM A536 ( 60-40-18, 65-45-12, 80-55-06).
We can do the casting,forging and accembly by our own factory
Strict qualitify control for the raw material
Perfect production process for each part
The most advanced equipments for production and inspection