Operating valve assembly with electromagnetic proportioning pressure reduction valve

A multiple valve assembly constructed by

• forming an operating valve assembly with an electromagnetic proportioning pressure reduction valve comprising:
• an operating valve including:
• a spool slidably disposed in a spool bore opening to an end face of a valve body, a spring case including a case body having a blind bore and a housing having a spool bore for a pressure reduction valve mounted on said end face in a manner such that said spool bore and said blind bore are matched to each other, and a pressure receiving chamber defined between the interior wall of said blind bore of said spring case and the end portion of said spool;
• and
• an electromagnetic proportioning pressure reduction valve including:
• a spool for the pressure reduction valve disposed in said spool bore for the pressure reduction valve, and a solenoid for driving said spool for the pressure reduction valve mounted on said housing, an output port of said electromagnetic proportioning pressure reduction valve being in communication with said pressure receiving chamber;
• and
• a plurality of operating valve assemblies coupled with electromagnetic proportioning pressure reduction valves;
• a pump port for the pressure reduction valve and a tank port for the pressure reduction valve being formed opening to front and back side end faces of said valve body, said pump port for the pressure reduction valve being in communication with an inlet port of said housing, said tank port for the pressure reduction valve being open to said spool bore for the pressure reduction valve of said housing;
• respective pump ports for the pressure reduction valves and tank ports for the pressure reduction valves of a plurality of operating valve assemblies with electromagnetic proportioning pressure reduction valves being in communication with each other;
• and
• a block having an inlet port for the pressure reduction valve and an outlet port for the pressure reduction valve communicating with one of said pump ports for the pressure reduction valves and one of said tank ports for the pressure reduction valves of a plurality of said operating valve assemblies with electromagnetic proportioning pressure reduction valves, respectively.

A multiple valve assembly constructed by

• forming an operating valve assembly with an electromagnetic proportioning pressure reduction valve comprising:
• (a) an operating valve including:
• a spool slidably disposed in a spool bore opening to an end face of a valve body, a spring case including a case body having a blind bore and a housing having a spool bore for a pressure reduction valve mounted on said end face in a manner such that said spool bore and said blind bore are matched to each other, and a pressure receiving chamber defined between an interior wall of said blind bore of said spring case and an end portion of said spool;
• and
• (b) an electromagnetic proportioning pressure reduction valve including:
• a spool for the pressure reduction valve disposed in said spool bore for the pressure reduction valve, and a solenoid for driving said spool for the pressure reduction valve mounted on said housing, an output port of said electromagnetic proportioning pressure reduction valve being in communication with said pressure receiving chamber;
• forming an operating valve assembly including:
• a spool slidably disposed in a spool bore opening to an end face of a valve body, a spring case including a case body having a blind bore and a housing having a spool bore for a pressure reduction valve mounted on said end face in a manner such that said spool bore and said blind bore are matched to each other, and a pressure receiving chamber defined between the interior wall of said blind bore of said spring case and the end portion of said spool;
• coupling a plurality of operating valve assemblies with electromagnetic proportioning pressure reduction valves and a plurality of said operating valve assemblies;
• a pump port for the pressure reduction valve and a tank port for the pressure reduction valve formed opening to front and back side end faces of said valve body, said pump port for the pressure reduction valve being in communication with an inlet port of said housing, said tank port for the pressure reduction valve being open to said spool bore for the pressure reduction valve of said housing;
• respective pump ports for the pressure reduction valves and tank ports for the pressure reduction valves of a plurality of said operating valve assemblies with electromagnetic proportioning pressure reduction valves and a plurality of said operating valve assemblies being in communication with each other;
• and
• a block having an inlet port for the pressure reduction valve and an outlet port for the pressure reduction valve communicating with one of said pump ports for the pressure reduction valves and one of the tank ports for the pressure reduction valves of a plurality of said operating valve assemblies with electromagnetic proportioning pressure reduction valves, respectively.