Marshalsea Hydraulics . . . 4-way directional control valve

Type 14550 4-way directional control valve
Comprising four cam-operated modules, each containing a partially balanced plunger which is unseated when the handle is operated. In the closed position, the plunger makes a leak-free seal with the seat. Being dynamically biased towards closing, the seal becomes tighter as pressure rises. A module can be readily withdrawn from the base of the valve body for servicing or renewing the seat or seals. Total handle movement of 90° gives positive detented selections at 45° intervals. The valve is suitable for use with a wide range of fluids and is designed for working pressures of up to 10,000 psi. Torque required to operate the handle remains light throughout the pressure range. Materials 316 stainless steel.


	This control valve conforms to Directive 94/9/EC relating to equipment intended for use in potentially explosive atmospheres and is ATEX (ATmosphere EXplosible) certified.

	Marshalsea Hydraulics has been assessed by SGS Société Générale de Surveillance SA and certified as meeting the requirements of ISO 9001:2000 for the design, development, manufacture and servicing of hydraulic pumps, relief valves and intensifiers.

ID	Symbol	Cam no.	Handle position 1	Handle centre	Handle position 2
A		01	Spindle A closed Spindle B open Spindle C open Spindle D closed Port 3 to pressure Port 2 to tank	Spindle A closed Spindle B closed Spindle C closed Spindle D closed All ports blocked	Spindle A open Spindle B closed Spindle C closed Spindle D open Port 3 to tank Port 2 to pressure
B		02	Spindle A open Spindle B closed Spindle C closed Spindle D open Port 3 to tank Port 2 to pressure	Spindle A closed Spindle B closed Spindle C open Spindle D open Port 1 blocked Ports 2 & 3 to tank	Spindle A closed Spindle B open Spindle C open Spindle D closed Port 3 to pressure Port 2 to tank
C		03	Spindle A open Spindle B closed Spindle C closed Spindle D open Port 3 to tank Port 2 to pressure	Spindle A closed Spindle B closed Spindle C closed Spindle D open Port 1 & 2 blocked Port 3 to tank	Spindle A closed Spindle B open Spindle C open Spindle D closed Port 3 to pressure Port 2 to tank
D		02	Spindle A open Spindle B closed Spindle C closed Spindle D open Port 3 to tank Port 2 to pressure	Not used	Spindle A closed Spindle B open Spindle C open Spindle D closed Port 3 to pressure Port 2 to tank
E		04	Spindle A closed Spindle B open Spindle C open Spindle D closed Port 3 to pressure Port 2 to tank	Spindle A open Spindle B closed Spindle C open Spindle D closed Ports 1 & 2 to tank Port 3 blocked	Spindle A open Spindle B closed Spindle C closed Spindle D open Port 3 to tank Port 2 to pressure

Product numbers for various options of spigot or handle for each of the IDs defined above can be found from the following table.