Patent ID: 6626208
Filing Date: 2003-09-30
Classification: F16K,Y10T

Abstract:
A check valve for use in a pressure balance faucet, comprising:a control valve body, a check valve block, a pair of positioning pins, two seal rings, a pair check valve sets and a valve mount; wherein: said control valve body has a control handle at one end and the other end is provided with an externally threaded junction in which a cold/hot water mixing outlet are defined at an upper and a lower position thereof respectively; in communication with said cold/hot water mixing outlet are disposed cold/hot water inlets; said valve mount has an extended duct at a front with an internally threaded section and a receiving interior in said duct for housing said check valve block; on an inner end wall of said receiving interior is defined a pair of positioning holes in alignment with retaining cavities of said check valve block and a pair of cold and hot water inlet holes are located at the central portion of said end wall in match with pivot retaining holes of said check valve block; at the summit of said round inner end wall is disposed a cold and hot mixing water outlet hole in alignment with a water outlet of said check valve block; to each side of said extended duct are symmetrically disposed a horizontal cold and hot water inlet duct which are in communication with the cold and hot water inlet holes respectively; to the upper and lower side of said extended duct are connected a cold and hot mixing water connecting duct both in communication with said cold and hot mixing water outlet hole; wherein the improvement is characterized in that: to a left side of a center line of said mixing outlet are disposed a retaining column at an upper and lower position thereof; said check valve block is provided with a pair of symmetric ring recesses at a front side thereof with a pivot retaining hole of a proper depth defined at a center of each said ring recess; a smaller limiting through hole is in communication with each said pivot retaining hole; at said front side of said check valve block are also disposed a pair of retaining cavities each located at a summit and bottom position of a left one said ring recesses; at a rear side of said check valve block is disposed a water outlet; there are two water inlets disposed on said rear side and communicating with said pivot retaining hole and said limiting through hole; said water inlets operate in match with said cold/hot water inlets of said control valve body; on said rear side and to a left portion thereof are disposed a pair of symmetric retaining holes of a proper depth which match in position with said retaining columns of said control valve body; a water outlet is located at the upper portion of said rear side of said control valve body and matches in position with said mixing outlet of said control valve body; said positioning pins are a two-staged rod respectively; said seal ring is fit to said ring recesses of said check valve block; each check valve set is made up of a sleeve mount, a spring, a valve stick and a sleeve; said sleeve mount is a hollow tube with a stop flange of a proper size at one end having a central through hole for the passage of a distal end of said valve stick; a plurality of axial ribs are disposed around said central through hole with a small retaining section extending at the end of said sleeve mount; said spring is registered with said central through hole and said valve stick which has an axially extended rod and an abutment disc; said seal ring is attached to said abutment disc; at a front end of said sleeve is disposed a sealing section and a closure hole of a smaller diameter for the limiting of said abutment disc of said valve stick; at the opposite end of said sleeve is disposed a snap means in correspondence to said retaining section of said sleeve mount; said valve mount has an extended duct at the front with an internally threaded section and a receiving interior in said duct for housing said check valve block; on the inner end wall of said receiving interior is defined a pair of positioning holes in alignment with said retaining cavities of said check valve block and a pair of cold and hot water inlet holes are located at the central portion of said end wall in match with said pivot retaining holes of said check valve block; at a summit of said round inner end wall is disposed a cold and hot mixing water outlet hole in alignment with said water outlet of said check valve block; to each side of said extended duct are symmetrically disposed a horizontal cold and hot water inlet duct which are in communication with said cold and hot water inlet holes respectively; to an upper and lower side of said extended duct are connected a cold and hot mixing water connecting duct both in communication with said cold and hot mixing water outlet hole.