Pre-set pressure relief valve

Claim 2

An improved sealing plug for cooperating with a circular seat comprising: a sealing disc having a flat circular forward sealing face for engaging and sealing against said seat, a rearward face, a forwardly extending conical projection on said forward face, a rearwardly extending cylindrical projection on said rearward face, a support washer disposed against said rearward face, said cylindrical projection extending through a hole in said washer, said washer having a diameter greater than that of said disc, an annular skirt on said washer extending forwardly thereof at right angles thereto and surrounding the periphery of said disc, a resilient tube frictionally fitted over said cylindrical projection and engaging said washer thereby holding it against said disc, and said conical projection having a base of a diameter greater than that of the hole in tHe washer so as to strengthen the disc against movement through said hole, and lesser than that of the circular forward face.

Claim 3

A pre-set, non-adjustable pressure relief valve comprising: a body having a through bore with first and second open opposite ends and a transverse bore intersecting and connecting with said through bore intermediate said ends, said bore adjacent said second end having smooth uninterrupted internal walls, an annular seat between said first end and said intersection, said annular seat surrounding a portion of said through bore, sealing means cooperating with said seat to close said through bore, said sealing means including, a resilient sealing disc having a flat circular forward sealing face engaging said seat and a projection extending from a rear side of said disc rearwardly toward said second end, the diameter of said disc being at least as great as that of said seat, a washer having a diameter at least equal to that of said circular seat and disposed against the rear side of said disc in supporting relationship, said washer having a depending annular flange surrounding a periphery of said disc, a hole in said washer, said projection extending therethrough, and resilient tube means surrounding said projection and engaging and holding said washer against said disc, said valve further including, a retainer frictionally secured in said through bore and closing said through bore at said second end, said retainer being cupshaped and including a flat bottom and an annular skirt surrounding said bottom and having external walls adapted for a frictional fit within said through bore, spring means between the flat bottom of said retainer and said sealing means for biasing said sealing means toward said first end and for holding said sealing means against said seat, said retainer being pressed into said through bore at said second end without restriction, except for said friction fit and the bias of said spring means, such that a predetermined sealing pressure between said seat and said sealing means is provided by the selected assembly position of the retainer with respect to said seat within said through bore.

Claim 4

A pre-set, non-adjustable pressure relief valve comprising: a body having a through bore with first and second open opposite ends and a transverse bore intersecting and connecting with said through bore intermediate said ends, said bore adjacent said second end having smooth uninterrupted internal walls, an annular seat between said first end and said intersection, said annular seat surrounding a portion of said through bore, sealing means cooperating with said seat to close said through bore, said sealing means including, a resilient sealing disc having a flat circular forward sealing face engaging said seat and a projection extending from a rear side of said disc rearwardly toward said second end, the diameter of said disc being at least as great as that of said seat, a washer having a diameter at least equal to that of said circular seat and disposed against the rear side of said disc in supporting relationship, said washer having a depending annular flange surrounding a periphery of said disc, a hole in said washer, said projection extending therethrough, and resilient tube means surrounding said projection and engaging and holding said washer against said disc, said valve further including, a retainer frictionally secured in said through bore and closing said through bore at said second end, said retainer being cupshaped and including a flat bottom and an annular skirt surrounding said bottom and having external walls adapted for a frictional fit within said through bore, spring means between the flat bottom of said retainer and said sealing means for biasing said sealing means toward said first end and for holding said sealing means against said seat, said retainer being pressed into said through bore at said second end without restriction, except for said friction fit and the bias of said spring means, such that a predetermined sealing pressure between said seat and said sealing means is provided by the selected assembly position of the retainer with respect to said seat within said through bore.

Claim 5

A valve as in claim 2 wherein said spring is a coil spring and engages said washer, said tube and said cylindrical projection fitting within said coil spring and serving as a guide therefor.

Claim 6

A valve as in claim 3 wherein said spring is compressed to a predetermined compression when said retainer is fitted into said opening so that said passageway remains closed up to a predetermined fluid pressure at said inlet.

Claim 7

A valve as in claim 2 wherein said spring means is a coil spring engaging said retainer at one end and said washer at another end, in order to urge said disc against said seal.

Claim 8

A valve as in claim 5 wherein said spring has a diameter approximately equal to that of said annular seat, and wherein said projection and said tube means extend rearwardly within said coil spring.

Claim 9

A valve as in claim 2 including a conical projection on the forward face of said disc, said conical projection having a base diameter greater than that of the hole in said washer.