초록 ▼

A control valve comprises a housing having an inlet for connecting to a source of water and an outlet, a pressure responsive diaphragm valve assembly including a valve disc having a front face and a back face mounted in the passage for engagement with the valve seat, and a pilot passage between the

A control valve comprises a housing having an inlet for connecting to a source of water and an outlet, a pressure responsive diaphragm valve assembly including a valve disc having a front face and a back face mounted in the passage for engagement with the valve seat, and a pilot passage between the front face and the back face, a friction plate on the back face, and a screen plate on the front face of the valve member, the screen plate having a cup shape and screen openings at a corner edge of the disc communicating with the pilot passage from the front face of the valve to a back of the diaphragm for controlling the rate of opening of the valve for controlling flow of fluid through the valve to the sprinkler unit.

대표청구항 ▼

[ I claim:] [1.] A sprinkler control valve, comprising:a housing having an inlet for connecting to a source of water, an outlet for connection to a distribution line for distributing water to a sprinkler unit, a passage connecting said inlet to said outlet;a valve seat in said passage;a pressure res

[ I claim:] [1.] A sprinkler control valve, comprising:a housing having an inlet for connecting to a source of water, an outlet for connection to a distribution line for distributing water to a sprinkler unit, a passage connecting said inlet to said outlet;a valve seat in said passage;a pressure responsive diaphragm valve formed with a valve disc having a front face and a back face mounted in said passage for engagement with said valve seat, and a pilot passage between said front face and said back face;a friction plate on said back face; anda screen plate on said front face of said valve member, said screen plate having a generally cup shape with a circular disc and a circular peripheral wall extending outward from said disc and screen openings through said plate at a corner edge of said plate at the juncture of said disc and said wall and communicating with said pilot passage from said front face of said valve to a back of said diaphragm.