Solenoid valves can't shut down there may be two reasons one: physical barriers, such as some gravel, leaves of branches, to prevent the diaphragm seal completely, after remove these obstacles, need to check whether there is damage to the diaphragm and accessories. Second: the effect on the diaphragm of the pressure is too small, there may be several reasons below: 1, the diaphragm chamber inlet strainer plug. This will prevent water from entering the diaphragm chamber, does not produce enough water pressure to close the diaphragm. 2, flow regulating handle too high ( Opening the biggest) 。 So in the case of low flow/low pressure, the diaphragm may hang in the high position, but not sealed. 3, the electromagnetic valve and untight seal between the valve body. Water leaking from them easily, which is unfavorable to produce enough pressure to close the diaphragm. 4, solenoid valve in a manual water state. The commonly used ( Such as nelson) There are two kinds of electromagnetic valve manual operating mode ( Water, water) Outside water, usually easy to recognize, and for general water within the customer is not easy to detect. 5, the diaphragm on the perforation ( Only refers to the well flow Industrial Valves) 。 In the interior diaphragm cannot produce enough pressure to close the diaphragm. Carefully check, if necessary, replace the diaphragm. 6, the electromagnetic valve installation direction is not correct. Electromagnetic direction of the arrow on the valve is in the direction of flow.
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