Valve adjustment arrangement and process for a tandem piston mas

Details Valve adjustment arrangement and process for a tandem piston mas Valve adjustment arrangement and process for a tandem piston mas

1991-06-10

1992-11-10

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60588, 60589, F15B 708, B60T 1120

Patent

active

051613760

ABSTRACT:
An arrangement and process for adjusting a supply valve closing in a tandem piston master cylinder is disclosed. The tandem piston master cylinder includes a piston stroked by engagement with an operating rod and a spaced floating piston driven by an interposed return spring, the floating piston captured by the rod engaged piston during the return stroke by a headed screw abutting a projection at the end of a bore within the screw head moves during relative movement between the pistons. Supply valves are opened and closed by the position of each piston. The piston relative positions are adjusted to achieve proper supply valve closing by rotation of the rod engaged piston while fixing the floating piston against rotation which rotates the screw thread which also slightly varies the precompression of the return spring. This adjustment selectively controls the point of closing of the supply valve associated with the floating piston relative the position of the rod operated piston. Pressurized air is used to detect supply valve opening and closing during the adjustment process.

REFERENCES:
patent: 3147596 (1964-09-01), Wallace
patent: 4510753 (1985-04-01), Steer
patent: 5044161 (1991-09-01), Schiel et al.

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