WM 784
2Pages

Catalog excerpts

WILLIAMS CONTROLS WM784 SERIES PRODUCT DESCRIPTION DESCRIPTION The WM784 series is composed of non-compensating, four-way control valves with three functional positions. These valves are actuated by control levers which spring return to the neutral position when they are not manually held in an applied position. WM784B1 models have a detent in the neutral position and WM784A and B models are equipped with a spring-loaded lockout safety device that locks the control lever in the neutral position to prevent unintentional movement. OPERATION When a WM784 valve's control lever is held in Position 1 (Refer to External Configuration.), outlet port 2 receives supply pressure and outlet 1 js exhausted. In Position 2 ("neutral") both outlet ports are exhausted; and outlet port 1 receives supply pressure while outlet 2 is exhausted if the lever is held in Position 3. Whenever the operator releases his hold on the control lever, it will spring-return to the neutral position. APPLICATION The WM784A is a versatile control valve with a variety of industrial and vehicular applications. WM784A valves are frequently used to control air operated relay valves, cylinders and power take off systems. TYPICAL INSTALLATION THREE POSITION SPRING RETURN FOUR-WAY CONTROL VALVE FUNCTIONAL DIAGRAM EXHAUST OUTLET 1 SUPPLY OUTLET 2 SUPPLY I. S. O. SYMBOL A 1 A_A.

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PARTS IDENTFICATION SCREW (100110) SPRING (101082) SPRING INLET BODY SPRING POPPET BODY ASSY. SCREW O-RING VALVE COVER (118333) UPPER BODY VALVE STEM HANDLE BUSHING (118295) LEVER PIN CAM ASSY. (118496 FOR WM784A, 118495 FOR WM784B MODELS) LATCH ASSY. (118304 FOR , WM784A,118303 FOR WM784B)| KNOB (118305) SPRING HANDLE BUSHING (118718) SPRING (101685) HANDLE DETENT (118719) VALVE COVER (118717) 1/8 MALE TO 164 FEMALE NPTF 90° ELBOW (FOR OUTLETS) 1/8 MALE TO 1/4 FEMALE NPTF ADAPTER (FOR INLET) Service these units with two 118400 repair kits. * Asterisk designates items included in repair...

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