公开(公告)号：US3491598A

公开(公告)日：1970-01-27

申请号：US3491598D

申请日：1967-09-13

Applicant: DRESSER IND

Inventor： WETTERHORN RICHARD H

IPC: G01K5/68 ,  G01L7/04 ,  G01L19/06 ,  G01K5/64

CPC classification number: G01K5/68 ,  G01L7/048 ,  G01L19/06

公开(公告)号：US3702141A

公开(公告)日：1972-11-07

申请号：US3702141D

申请日：1971-02-22

Applicant: DRESSER IND

Inventor： WETTERHORN RICHARD H

IPC: F16K17/04 ,  F16K17/08 ,  F16K17/30

CPC classification number: F16K17/082 ,  F16K17/0433 ,  Y10T137/7738 ,  Y10T137/7876 ,  Y10T137/7932 ,  Y10T137/7939

Abstract: A GAS TYPE SAFETY VALVE HAVING CONTROLLED FORCE LIFT CHARACTERISTCS. DISCHARGE PORTS OF PREDETERMINED AREA CONFIGURATION PROVIDE EFFECTIVE DISCHARGE PRESSURE DROPS THAT ARE CAUSED TO VARY AS A FUNCTION OF OPERATING SET PRESSURE. VARYING THE DISCHARGE PRESSURE DROP IN THIS MANNER UTILIZES A BALANCE OF DYNAMIC FLOW FORCES FOR ACHIEVING A PRESSURE CONTROLLED BLOWDOWN. OPERATIVE PRESSURE RANGES OF INDIVIDUAL SPRING COMPONENTS PREVIOUSLY CHARACTERIZED BY LIMITED RANGE SUITABLITY ARE THEREBY EXTENDED OVER A WIDE RANGE OF SET PRESSURES AND SPRING RATES.