Pumps – Motor driven – Fluid motor
Patent
1995-04-20
1997-03-18
Thorpe, Timothy
Pumps
Motor driven
Fluid motor
91319, 277165, 13762569, F04B 1700, F04B 5300
Patent
active
056116780
ABSTRACT:
An air driven diaphragm pump having two diaphragms joined by a common control shaft to reciprocate in opposed chambers for pumping material through check valve ported cavities. An actuator valve is associated with the central housing of the pump and includes a valve cylinder within which a valve piston reciprocates. The valve piston is caused to reciprocate by alternate venting of the ends of the cylinder. Air chamber passages are controlled by the control shaft to vent the ends of the valve cylinder. A cylindrical portion of the control shaft includes axial slots for venting alternate ends of the valve piston. Annular channels manifold air to and from the axial slots. Seals of elastomeric annular rings and PTFE cylindrical inner liners bonded to the annular rings are arranged in certain of the annular channels, the sidewall of one of which is relieved outwardly for increased venting air flow.
REFERENCES:
patent: 3071118 (1963-01-01), Wilden
patent: 3636824 (1972-01-01), Clark
patent: 3770285 (1973-11-01), Grover
patent: 4247264 (1981-01-01), Wilden
patent: 4406596 (1983-09-01), Budde
patent: 4793433 (1988-12-01), Emori et al.
patent: 5169296 (1992-12-01), Wilden
patent: 5222876 (1993-06-01), Budde
patent: 5362212 (1994-11-01), Brown et al.
McAndrews, Jr. Roland G.
Thorpe Timothy
Wilden Pump & Engineering Co.
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