Type 14550 4-way directional control valve . . . Marshalsea Hydraulics

	Four cam-operated modules – positive detented selections at 45° intervals.
	Dynamically biased towards closing – seal becomes tighter as pressure rises. .
	Suitable for a wide range of fluids – up to 690 bar (10,000 psi).
	Torque to operate handle is light throughout the pressure range.
	Made with 316 stainless steel.

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A module can be readily withdrawn from the base of the valve body for servicing or renewing the seat or seals.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.

Subsea versions are available – position selected by ROV – springs to centre if not positioned otherwise.

Product numbers for various options of spigot or handle for each of the IDs defined on the large table below are as follows:

ID	Spigot 3/8"NPT	Handle 3/8"NPT	Spigot 3/8"BSP	Handle 3/8"BSP

A	14550–01	14550–08	14550–15	14550–19
B	14550–02	14550–09	14550–16	14550–20
C	14550–03	14550–13	14550–17	14550–21
D	14550–05	14550–10	14550–24	14550–23
E	14550–06	14550–11	14550–25	14550–27

Also available with 1/2"NPT F and with 3/8"MP Butech ports.

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