CHINESE OA LOGIN
News
Company News
Industry News
Contact Us
Tel: 0371-67987950
Fax: 0371-67996290
Mail box: pdshanlg@163.com
Website: www.henanhuilong.com
Address: No. 11, Xuesong Road, West High-tech Industrial Development Zone, Zhengzhou City
Detailed
Outline the advantages of high pressure shut-off valves and high pressure shut-off valves
Time£º2019-1-21
The opening and closing member of the high pressure shut-off valve is a plug-shaped valve flap having a flat or tapered surface, and the valve flap moves linearly along the center line of the fluid. The movable high pressure stop valve type of the valve stem has a lifting rod type (the valve stem is lifted and lowered, the hand wheel does not move up and down), and there is also a lifting rotary rod type (the hand wheel and the valve stem rotate together and the nut is set on the valve body). The shut-off valve is only suitable for full opening and full closing, and adjustment and throttling are not allowed.
The high pressure shut-off valve is a forced-sealed valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface to leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction force of the valve stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve The diameter of the rod is large, otherwise the valve stem may be bent. In recent years, after the appearance of the self-sealing valve, the medium flow direction of the shut-off valve is changed into the valve cavity from above the valve flap. At this time, under the action of the medium pressure, the force of closing the valve is small, and the force of opening the valve is large, the valve stem is The diameter can be reduced accordingly. At the same time, this type of valve is also tight under the action of the medium. China's valve "three-way to give" has stipulated that the flow of the stop valve, all from top to bottom.
When the high pressure shut-off valve is opened, the opening height of the valve flap is 25% to 30% of the nominal diameter, and the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the full open position of the shutoff valve should be determined by the stroke of the valve flap.
Advantages of high pressure shut-off valves:
The structure is simple, and the manufacturing and maintenance are convenient.
The working stroke is small and the opening and closing time is short.
The sealing performance is good, the friction between the sealing surfaces is small, and the service life is long.
Copyright@2008-2019 www.henanhuilong.com Inc. All rights reserved.
Tel: 0371-67987950 Fax: 0371-67996290 E-mail: pdshanlg@163.com
Address: No. 11, Xuesong Road, West High-tech Industrial Development Zone, Zhengzhou City