DECOMPRESSION COUPLING BLOCK

摘要

A decompression block assembly for coupling a source of hydraulic pressure to a hydraulically operated attachment. The assembly includes a valve body defining first and second ports that are fluidly connected to first and second couplers that are connectable to hoses of the attachment. The valve body includes a shuttle chamber having an opposed valve seats and a valve element engageable with the valve seats depending on residual pressure in fluid passages. A release member is operable to connect the shuttle valve to a drain port to discharge residual pressure in one or both fluid passages communicating with the attachment. The release member, when operated, opens a check valve in order to discharge residual pressure.

主权项

1. A decompression block assembly for coupling a source of hydraulic pressure to a hydraulically operated attachment, comprising:
a) valve body defining a first port and a second port connectable to hydraulic lines from a source of hydraulic pressure; b) said valve body further including first and second hydraulic couplers connectable to first and second hydraulic lines extending from said hydraulically operated attachment; c) said valve body defining a first flow passage by which said first port is communicated with said first coupler and a second flow passage for communicating said second port with said second coupler; d) said valve body including a drain port and defining a drain passage; e) said valve body including a shuttle valve chamber defining spaced apart, opposed valve seats and a shuttle valve element located within said shuttle chamber engageable with said first or second valve seats; f) said first valve seat communicating with said first flow passage and said second valve seat communicating with said second flow passage; g) under certain operating conditions, said shuttle chamber communicating with said drain passage; h) a spring-biased check valve element controlling the communication of said shuttle chamber with said drain passage; i) a release member engageable with said spring-biased check valve element and operable to unseat said check valve element to allow said shuttle chamber to communicate with said drain passage when said release member is moved to a residual pressure releasing position; j) said shuttle valve element engageable with said second seat when a fluid pressure in said first flow passage is greater than a fluid pressure in said second flow passage and said shuttle valve element engageable with said first seat when a fluid pressure in said second flow passage is greater than a fluid pressure in said first flow passage.