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 opening and closing member of the stop valve (Globe Valve) is a plug-shaped valve flap having a flat surface or a sea cone surface, and the valve flap moves linearly along the center line of the valve seat. The movement of the valve stem, (common name: dark rod), and the lifting rotary rod type can be used to control various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. flow. Therefore, this type of shut-off globe valve is well suited for shut-off or regulation and throttling. Due to the relatively short opening or closing stroke of the valve stem of this type of valve, and the very reliable cutting function, and because the change of the valve seat opening is proportional to the stroke of the valve flap, it is very suitable for the adjustment of the flow rate.
Working principle and characteristics of the stop valve
Compared with another commonly used cut-off type valve in industrial production, the shut-off valve is structurally simpler than the former, and is easy to manufacture and repair. In terms of service life, the sealing surface of the shut-off valve is not easy to wear and scratch, and there is no relative sliding between the valve flap and the sealing surface during the valve opening and closing process, so the wear and scratch on the sealing surface are small, so the sealing is improved. The service life stop valve of the auxiliary service has a small valve stroke during the full-closed process, and its height is relatively small compared to the alarm valve. The disadvantage of the shut-off valve is that the opening and closing torque is large and it is difficult to achieve rapid opening and closing. Because the flow passage in the valve body is relatively tortuous, the fluid flow resistance is large, and the fluid power is greatly lost in the pipeline.
(1) The fluid resistance is large, because the medium passage in the valve body is tortuous, the fluid resistance is large, and the power consumption is large.
(2) When the nominal pressure of the medium flow direction is PN≤16MPa, the downstream flow is generally adopted, and the medium flows upward from the lower side of the valve flap; when the nominal pressure PN≥20MPa, the counterflow is generally adopted, and the medium flows downward from above the valve flap. To increase the sealability. When in use, the shut-off valve medium can only flow in one direction and cannot change the flow direction.
(3) The valve flap is often eroded when fully open.
The stem axis of the shutoff valve is perpendicular to the seat sealing surface. The valve stem has a relatively short opening or closing stroke and a very reliable shut-off action, making this valve suitable for use as a medium for cutting or regulating and throttling.
With more than 30 years of casting history, Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. Wecan 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. Quality is particularly prominent in similar industries.