ANTI HAMMER PILOT OPERATED VALVES HAVING REMOTE PILOT FOR USE IN REFUELLING, DOMESTIC MAINS WATER, REFRIGERATION APPLICATIONS

A pilot operated valve having an inlet passageway (8) surrounded by an annular seat (6) surrounded by an outlet passageway (110) respectively. The main valve member (7) having turbulence shield (11) of greater diameter than the external diameter of the seat (113) and deflector plate (34). Turbulence shield (11) slows the descent of the valve during closing and prevents water hammer. Pressure chamber inlet (37 or 14) may have a check valve (15 or 21 respectively). Trigger passageway (17) is remotely operated depending on the application. For example a latching solenoid arrangement (figs. 3 to 7), float (figs. 10 and 11), handle or pressure balanced piston (fig. 15). The latching arrangement involves two solenoids with interacting armatures. As a refuelling valve trigger passageway (17) has a first pilot valve at a distal end opened upon coupling to the destination tank to vent the pilot chamber (12) and open main valve (7). A float comprises a second pilot valve which closes the trigger passageway prior to disengagement of the coupling to trigger the closing ot the main valve (6). A third manually operated pilot valve may be located on the main valve body. As a faucet valve (fgs. 12 to 14) the main valve resides under the counter and the pilot above. In one such arrangement the passageway (17) is concentric with the outlet (10), in another the pressure chamber inlet (14) and trigger (17) passageways are concentric. The pressure chamber (12) and outlet (10) may be concentric and in line (fig. 12).