# US 2019/0170266 A1 · Pressure relief valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170266 A1 - Document ID: US20190170266A1 - Status: Published application - Kind: A1 - Application number: 16/143,545 - Filed: 2018-09-27 - Published: 2019-06-06 - Earliest claimed: 2017-12-01 - Assignees: Microtecnica S.R.L. - Applicants: Microtecnica S.r.l. - Inventors: Enrico QUAGLIA; Claudio CARPIGNANO; Dario TURTURICI - Web page: https://patentgrep.com/patent/US20190170266A1 ## CPC - F16K 17/06: with special arrangements for adjusting the opening pressure - F16K 1/38: of conical shape - F16K 17/0466: {with a special seating surface} - F16K 17/082: {with piston} - F16K 27/02: of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) - F16K 15/025: {the valve being loaded by a spring (F16K15/03 - F16K15/12 take precedence)} - Y10T 137/7932: Valve stem extends through fixed spring abutment - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A new type of pressure relief valve is described herein which has advantages over standard valves in that it may comprise a longer plunger than normal, and two guiding points located far away from each other for guiding the plunger within the housing. The valve may also comprise improved exhaust ports and an anti-rotation washer. ## Claims ### Claim 1 A pressure relief valve comprising: a housing having a first end and opposite second end and a housing side wall extending there between; and an inlet port provided at said first end of said housing; and at least one discharge port extending through said housing side wall; and a plunger provided within the interior of said housing; said plunger being configured to move between a first position wherein said plunger is blocking said at least one discharge port and a second position wherein said plunger is not blocking said at least one discharge port. ### Claim 2 (depends on 1) The pressure relief valve of claim 1, wherein said plunger has a diameter to length ratio of lower than about 1:2. ### Claim 3 (depends on 1) The pressure relief valve of claim 1, wherein the plunger has a diameter ratio of about 1:4. ### Claim 4 (depends on 1) The pressure relief valve of claim 1, wherein: said plunger extends longitudinally between a first end and a second end; and an outer surface of said plunger contacts a first internal feature of said valve housing at a first point at said first end of said plunger and contacts a second internal feature of said valve housing at a second point at said second end of said plunger. ### Claim 5 (depends on 1) The pressure relief valve of claim 1, wherein the valve has a longitudinal axis L extending between said first end and said opposite second end, wherein said at least one discharge port extends at a first angle that is not perpendicular to said longitudinal axis L. ### Claim 6 (depends on 5) The pressure relief valve of claim 5 wherein, said plunger comprises an outer surface and wherein a section of said plunger that blocks said discharge port in said first position extends at a second angle to said longitudinal axis L. ### Claim 7 (depends on 6) The pressure relief valve of claim 6, wherein said first angle and said second angle are substantially identical. ### Claim 8 (depends on 1) The pressure relief valve of claim 1, further comprising: a rotatable calibration cap provided at said second end of said housing; a spring provided around said plunger, said spring being configured to provide pressure to said plunger in the direction X of said inlet port; wherein said plunger has a first end and an opposite second end and is configured to move between said first position wherein said first end of said plunger is blocking said at least one discharge port and said second position wherein said first end of said plunger is not blocking said at least one discharge port; and further comprising an anti-rotation washer provided at said second end of said plunger, said anti-rotation washer being configured to prevent rotation of said spring when said calibration cap is rotated. ### Claim 9 (depends on 8) The pressure relief valve of claim 8, wherein said anti-rotation washer comprises one tooth or a plurality of teeth on its outer circumference. ### Claim 10 (depends on 9) The pressure relief valve of claim 9, wherein an inner surface of said housing comprises a groove or a plurality of grooves, said grooves being shaped and sized so as to mate with said tooth or teeth of said anti-rotation washer. ### Claim 11 A method of manufacturing a pressure relief valve comprising: providing a housing having a first end and an opposite second end and a housing side wall extending there between; and providing an inlet port at said first end of said housing; and providing at least one discharge port to extend through said housing side wall; and providing a plunger within the interior of said housing; said plunger being configured to move between a first position wherein said plunger is blocking said at least one discharge port and a second position wherein said plunger is not blocking said at least one discharge port. ### Claim 12 (depends on 11) The method of claim 11, further comprising providing said plunger so as to have a diameter to length ratio of less than about 1:4. ### Claim 13 (depends on 11) The method of claim 11, wherein said diameter to length ratio is about 1:4. ### Claim 14 (depends on 11) The method of claim 11, wherein said housing has a longitudinal axis, and wherein said step of providing said at least one discharge port comprises forming said at least one discharge port so that it extends through the housing side wall at a first angle that is not perpendicular to said longitudinal axis L. ### Claim 15 (depends on 11) The method of claim 11, further comprising: providing a rotatable calibration cap at said second end of said housing; and providing a spring associated with said plunger, said spring being configured to provide pressure to said plunger in the direction X of said inlet port; said plunger having a first end and an opposite second end and being configured to move between a first position wherein said first end of said plunger is blocking said at least one discharge port and a second position wherein said first end of said plunger is not blocking said at least one discharge port; and further comprising an anti-rotation washer provided at said second end of said plunger, said anti-rotation washer being configured to prevent rotation of said spring when said calibration cap is rotated.