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.
Sales manager： Mrs.peng E-mail: email@example.com
Tel： 0086-0577-86621768 Fax： 0086-0577-86621935
Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,China
Alloy steel hard seal ball valves are mandatory seal valves, so when the valve is closed, pressure must be applied to the valve flap to force the seal face to leak. When the medium enters the valve six from below the valve flap, the resistance to be overcome by the operating force is the friction force of the alloy steel hard-sealed ball valve stem and packing and the thrust generated by the pressure of the medium. The force of closing the valve is higher than that of the valve. The force is large, so the diameter of the valve stem is large, otherwise the valve stem top bend will occur.
In recent years, after the appearance of self-sealing alloy steel hard-sealed ball valve, the medium flow direction of the alloy steel hard-sealed ball valve is changed from the valve flap to the valve cavity. At this time, under the action of the medium pressure, the force of closing the valve is small, and the valve is opened. The force of the valve is large and the diameter of the valve stem can be correspondingly reduced. At the same time, the alloy steel hard seal ball valve is also tight under the action of the medium. China's valve "three-way to give" has stipulated that the flow direction of alloy steel hard-sealed ball valve, all from top to bottom.
Advantages of using alloy steel hard seal ball valve:
Alloy steel hard seal ball valve adopts soft T-shaped multi-layer stainless steel sheet to form a sealing ring. It has the double advantages of metal hard seal and soft seal. The alloy steel hard seal ball valve has zero leakage at low temperature and high temperature. Sealing performance. When the test proves that the positive flow state of the tank (the direction of flow of the medium is the same as the direction of rotation of the disc), the pressure of the sealing surface is caused by the action of the torque of the transmission and the pressure of the medium on the valve plate. When the positive medium pressure increases, the inclined surface of the valve plate and the sealing surface of the alloy steel hard seal ball valve seat are pressed tighter, and the sealing effect is better.
To supply finished valve casting parts, we have machining equipments as well (NC lathe, CNC, boring machine, drilling machine, ect) for different machining requirements. Besides, we also have hydraulic testing capability to ensure workable valve castings.
For large dimensions valve casting parts, to avoid casting defects, it is necessary to do magnetic particle testing and ultrasonic testing after casting.