Importance

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Abstract

This magnetically operated valve and timer assembly (30) can be used to open a feed line (14) leading to a spray head (22) within a chemical feed block (12) to dispense a chemical solution. The assembly (30) includes a valve (34) having a valve closure plunger (52) which is moved into the open position for a predetermined time under the attraction of a magnet assembly (66) mounted to the valve (34). The time period is determined by timer (36) which is connected to the magnet assembly. The timer (36) includes a cylinder (80) receiving a piston (100) in sliding relation, the piston including a head (102) a rearward shaft (104), having a knob (108), and a forward shaft (106) connected to the magnet assembly. The piston head (102) includes a tapered groove (122) for an annular cup seal (126) which moves into a position in the groove during the forward stroke to facilitate fluid flow past the seal ( 126) from one side of the piston to the other. The seal (126) moves into a different position in the groove (122) to preclude fluid flow past the seal during the return stroke so that fluid must flow through the head by way of restrictive passages (120) thereby retarding the return stroke. The restrictive passages (120) include a metering orifice (140) which is controlled by an adjustable needle (154). The piston chamber (92) includes an enlarged portion (96) to facilitate the timing of the return stroke.

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First Claim