Fluid operated diaphragm pump with fluid timing control and control circuit manifold mounted on pump body

摘要

A pneumatically actuated diaphragm type metering pump is controlled by a pneumatic control circuit including a pilot actuated two position valve for pressurizing and venting the pump power piston chamber and which is controlled by a second pilot actuated two position valve. Timing chambers and a flow control valve in the control circuit operate to vary the frequency of the pumping cycle. The control circuit is included in a manifold assembly made up of a series of circular plate members assembled in staked relationship and including all of the fluid passages of the control circuit as well as the pneumatic timing chambers. The manifold assembly is mounted directly on an end wall of the pump body which provides for a single control fluid inlet passage and a single discharge passage for venting control and power piston fluid from the pump. The pump stroke may be varied by an adjustable abutment engageable with the pump power piston and including a threaded shank portion projecting through an end wall of the pump body into a bore in the manifold assembly whereby the abutment may be adjusted from the exterior of the pump.