是一种特殊形式的截断阀，最突出特点是隔膜把下部阀体内腔与上部阀盖内腔隔开，使位于隔膜上方的阀杆、阀瓣等零件不受介质腐蚀，省去了填料密封结构，且不会产生介质外漏。 Diaphragm valve is a special form of cut-off valve. The most prominent feature is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper bonnet. Packing sealed structure, no leakage of medium. But sometimes
Some common faults still occur.
First: Reasons for inflexible handwheel operation are valve stem bending and thread damage
The solution is to replace the valve stem, trim the threads, and add lubricant
不能自动启闭的原因有橡胶隔膜损坏、气源压力过低、弹簧顶紧力过大 Second: The reasons that the pneumatic diaphragm valve cannot open and close automatically include the damaged rubber diaphragm, the air source pressure is too low, and the spring pressing force is too large.
The solution is to replace the diaphragm, increase the air supply pressure, and reduce the spring tension.
Third: The leakage at the connection between the valve body and the bonnet is caused by the rupture of the rubber layer in the valve body and the connection bolts being loose.
The solution is to replace the valve body and tighten the connecting bolts.
的常见故障 Common faults of diaphragm valves
1. Replace valve body 2. Handwheel operation is not flexible 3. Leakage at valve body and valve cover connection