초록 ▼

A process control valve is disclosed including a valve body assembly which includes process fluid input and output ports, an actuation pressure port and a vent port. The valve body includes a cylinder with two pistons longitudinally spaced and separated by a biasing means such as a spring. The pisto

A process control valve is disclosed including a valve body assembly which includes process fluid input and output ports, an actuation pressure port and a vent port. The valve body includes a cylinder with two pistons longitudinally spaced and separated by a biasing means such as a spring. The pistons each have a rod which acts as a seal for a process fluid port when normally biased by the biasing spring. The actuation port of the body assembly communicates with the opposite faces of the pistons from the bias spring to open the process fluid input and output ports by overcoming the biasing port closing force. The two pistons include rods having process fluid passageways therethrough. The pistons also include a valve poppet & seat combination which is closed whenever actuation force is applied to the process control valve sealing the process fluid path from the vent port. A reversible input/output valve is disclosed as well as a modular assembly of interchangeable valves is disclosed.

대표청구항 ▼

[ I claim:] [1.]1. A process fluid sampling valve comprising:a valve body assembly including an actuation port;an vent port;a process fluid inlet port; anda process fluid outlet port;a valve cylinder within said valve body in communication with each of said ports;a first piston within said cylinder

[ I claim:] [1.]1. A process fluid sampling valve comprising:a valve body assembly including an actuation port;an vent port;a process fluid inlet port; anda process fluid outlet port;a valve cylinder within said valve body in communication with each of said ports;a first piston within said cylinder between said inlet port and all of said actuation port, said vent port and said outlet port;a second piston within said cylinder between said outlet port and all of said actuation port, said vent port and said inlet port;a portion of said first piston selectively closing said inlet port;a portion of said second piston selectively closing said outlet port;means normally biasing said first and second pistons to close the respective inlet and outlet port;said actuation port coupled to a source of actuating pressure;said valve body assembly defining actuation pressure passages to said first and second pistons to open said inlet and outlet ports upon the application of valve actuation pressure to said actuation port;said pistons each including respective passages therethrough providing fluid communication between said inlet port and said outlet port responsive to actuation pressure produced movement of said pistons; andmeans sealing said vent port from said inlet and outlet ports upon actuation pressure induced movement of said pistons.