Patent ID: 6283146
Filing Date: 2001-09-04
Classification: G05D,Y10T

Abstract:
In a gage-in-handle type pressure reducing valve of the type wherein a valve chamber is disposed between a primary-side port and a secondary-side port, and a main valve element in said valve chamber is urged toward a main valve seat by a valve spring, said main valve element being urged away from said main valve seat by a pressure regulating spring fitted between a feedback member and a pressure regulating spring retainer, and further a pressure gage is disposed in a cylindrical handle, and a feedback chamber between said feedback member and said valve chamber communicates with said pressure gage through a pressure introducing communicating passage,the improvement which comprises:a pressure regulating nut rotatably supported in a bonnet, said pressure regulating nut having an internal thread;said pressure regulating spring retainer being supported in said bonnet so as to be axially movable but unable to rotate, said pressure regulating spring retainer having a tubular portion with an external thread, wherein said internal thread of said pressure regulating nut is in engagement with said external thread of the tubular portion of said pressure regulating spring retainer;a pressure gage guide connected to said pressure gage, said pressure gage guide being supported in the tubular portion of said pressure regulating spring retainer so that said pressure gage guide and said pressure regulating spring retainer are axially movable but unable to rotate relative to each other; anda communicating hole formed in said feedback member so as to communicate with said feedback chamber, said communicating hole being communicated with said pressure gage guide through a communicating line of said pressure introducing communicating passage;wherein rotation of said handle causes said pressure regulating nut to rotate, and this, in turn, causes said pressure regulating spring retainer to move axially.