초록 ▼

A fluid flow control valve has a rotary spool with one or more standard, circular O-rings held in stretched condition by shoulders on the spool so that instead of extending all the way around the circumference of the spool each O-ring extends only a part of the way around the circumference and has t

A fluid flow control valve has a rotary spool with one or more standard, circular O-rings held in stretched condition by shoulders on the spool so that instead of extending all the way around the circumference of the spool each O-ring extends only a part of the way around the circumference and has two longitudinally extending sections as well as two arcuate circumferential sections that serve to seal the spool in the spool bore both during movement and while it is in a selected fluid flow controlling position.

대표청구항 ▼

In a valve having a body with a cylindrical bore and a plurality of ports opening into said bore, a generally cylindrical spool assembly rotatably mounted in said bore to control flow between said ports, said spool assembly comprising a spool member and an elastomeric O-ring member mounted on the sp

In a valve having a body with a cylindrical bore and a plurality of ports opening into said bore, a generally cylindrical spool assembly rotatably mounted in said bore to control flow between said ports, said spool assembly comprising a spool member and an elastomeric O-ring member mounted on the spool member, said O-ring member being stretched lengthwise of the spool member and secured thereto so that it extends substantially less than all the way around the circumference of the spool member, said O-ring member sealingly engaging the wall of said bore and being rotatable with the spool assembly to pass across from one side to the other of at least one of said ports and provide means for flow control for said one port.