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Description & Operation
TYPES A, B, D, K, M & Q are packless, internal PISTON, PILOT OPERATED solenoid valves and require a 5 PSI MINIMUM OPERATING PRESSURE DIFFERENTIAL. When the coil is energized, it lifts the pilot valve off the seat screw, opening the pilot orifice through the center of the piston to the outlet side of the valve. This relieves the pressure from the top of the piston ring and pressure under the piston ring forces the piston up to open the main valve orifice. When the coil is de-energized, the pilot valve returns to close the pilot orifice and pressure across the piston ring is equalized through a timing orifice in the side of the piston or in the valve body. The piston spring returns the piston to close the main valve orifice.

TYPES F, G, GX, B3, AD, QD, & KD are DIRECT ACTING solenoid valves and do not require a minimum operating differential pressure. When the coil is energized, it lifts the solenoid plunger, which is mechanically connected to the valve seat and lifts it to open the main valve orifice. When the coil is de-energized, gravity and flow return the valve seat to close the main valve orifice.

NORMALLY CLOSED valves OPEN when the coil is energized. NORMALLY OPEN valves (indicated by the letter R after the basic type designation) CLOSE when the coil is energized. The PILOT VALVE ONLY is normally open on piston pilot operated solenoid valves. The PISTON opens only with application of PRESSURE.

ALL Standard valves are supplied with CONTINUOUS DUTY COILS of the proper class of insulation for the service indicated on the nameplate. The COIL TEMPERATURE after being energized for extended periods, although uncomfortably warm to touch, is a safe operating temperature. Smoke or burning odor indicates excessive coil temperature.