| 摘要 |
A pressure unloading valve responsive primarily to the pressure of the outlet passage in a diaphragm pump. The pump includes a driving fluid chamber and a pump chamber separated by a flexible diaphragm. Between the pump chamber and the outlet passage is a check valve allowing fluid flow only from the pump chamber to the outlet passage. The unloader valve is unseated, allowing relief of fluid pressure in the driving fluid chamber, when the pressure in the outlet passage exceeds a first predetermined value or when the pressure in the driving fluid chamber exceeds a second predetermined value. An adjustment knob is provided to vary the first and second predetermined values. An anti-blow-by seal is provided to check fluid seepage from the driving fluid chamber to the sump.
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