• img1
  • img2
  • img3

+86-571-82793342

hzxscyhdc@126.com

Product Categories

Contact Us

Hangzhou Xiaoshan Chuangye Metal Processing Factory

Add:Zixia Village, Xintang Street, Xiaoshan District, Hangzhou City, Zhejiang Province, China

Contact:Yali Yu

Tel:86-571-82793342

Fax:86-571-82778852

Mobile:86-13967182887

E-mail:ada.huang@hzxscy.cn


Home > News > Content
How To Operate The Manual Valve Correctly

A manual valve is a valve that is commonly used on equipment and devices. It is operated by a handle or a hand wheel. Under normal circumstances, the handle, hand wheel rotation is defined as the closing direction, counterclockwise rotation is defined as the opening direction. However, some valves open and close in the opposite direction to the above, and should be checked before the operation to check the open and close signs.

Manual valve, the size of its handle, hand wheel is designed according to normal people. Therefore, in the use of the valve, it is stipulated that the operator is not allowed to open and close the valve by means of a lever and a long wrench. At the same time, the length of the handle and the diameter of the handwheel is less than 320mm, only one person is allowed to operate; a handwheel with a diameter equal to or greater than 320mm allows the two to operate together, or allows one to operate with an appropriate lever (generally not exceeding 0.5m in length). However, diaphragm valves and non-metallic valves are prohibited from using levers or long wrenches, and they must not be closed with excessive force.

Some operators are accustomed to using levers and long wrenches to operate manual valves. It is believed that the greater the closing force, the better. This is not the case. This can cause premature valve damage, or even cause an accident. Practice has proved that: In addition to the impact type hand wheel, too much too fast to operate the valve can easily damage the hand wheel, handle, scratch the stem and the sealing surface, and even crushed sealing surface. Secondly, after the handwheel or handle is damaged or lost, they should be promptly filled and no live wrenches are allowed.

Valves such as gate valves and globe valves must be rotated 1/4 to 1/2 turn when they are closed or open to the head (ie, bottom dead center or top dead center) to make the threads more tightly fit to facilitate checking during operation to avoid twisting. Tightened damaged valve.

Larger diameter butterfly valves, gate valves, and globe valves, some with bypass valves. The function of the bypass valve is to balance the inlet and outlet pressure differentials and reduce the opening torque. When opening, bypass valve should be opened first, then open the big valve.


Hangzhou Xiaoshan Chuangye Metal Processing Factory

Add:Zixia Village, Xintang Street, Xiaoshan District, Hangzhou City, Zhejiang Province, China

Contact us:Yali Yu

Tel:86-571-82793342

Fax:86-571-82778852

Mobile:86-13967182887

E-mail:ada.huang@hzxscy.cn


Contact Us
Hangzhou Xiaoshan Chuangye Metal Processing Factory

Address: Zixia Village, Xintang Street, Xiaoshan District, Hangzhou City, Zhejiang Province, China

Tel: +86-571-82793342

Fax: 86-571-82778852

E-mail: hzxscyhdc@126.com

Copyright © Hangzhou Xiaoshan Chuangye Metal Processing Factory All rights reserved.
foottop