SDV40 Directional Control Valve: Max Flow 40GPM

SDV40 Directional Control Valve

SDV40 valve is an aftermarket version of the DVA/DVG 20 control valve. First of all these valves provide reliable control of fluid power for a variety of uses. The SDV model valves are made from compacted graphite and a high strength iron alloy. As a result, these valves are rated at 3500 PSI.

SDV40 valves come with several standard features. These features contribute to its outstanding performance. Symmetrical timing makes changing over from left-to-right hand operation simple. The only thing needed to do is remove the spool and re-insert it in the opposite direction. Furthermore, spool seals are fitted in counterbores allowing for easier maintenance and smoother spool operation. These features combined with the extensive range of available spool options, make these valves among the most versatile on the market.


The valves have a built-in full flow relief valves. They also have parallel and series circuits in one bank. The SDV40 valves can be controlled through manual, hydraulic, electric, or pneumatic operation. They also have sectional construction giving them maximum flexibility in their use. The ability to change the spool around allows for right and left-hand valve assembly. Finally, they have low spool effort, hence improved metering.


The SDV40 can handle a flow of up to 40 gallons per minute. The maximum operating pressure for the SDV40 is 3500 psi.

Inlet Section

The Inlet section has three choices. These choices are port size, type of ports, and finally an inlet relief valve or an inlet plug(no relief). The type of ports is either pipe thread, O-ring boss straight thread, or 4 bolt flange. Once chosen all the sections will have the same port type.

Work Section

There are three choices for the work sections spool applications. First of all, is the cylinder type spool application (A and B work ports are blocked in the neutral position). Next is the motor type spool application (A and B work ports are open to the tank in neutral position). Finally is the single-acting cylinder type spool application (The A work port is blocked in neutral and has no B work port).

Spool Position Control

There are three spool position control choices. First of all, is the 3 position spring return to neutral. Also available is the detent in 3 positions. Finally, there is the rotary friction detent variable from A position through B position.

Spool Actuators

There are four choices for the spool actuators. First is the manual lever metering. Next is the rotary lever metering option. Another of the choices is the hydraulic pressure actuating option(on or off, proportional pressure metering, or solenoid controlled/pressure actuated). Finally, is the air pressure actuating options which are on or off, proportional pressure metering, or solenoid controlled/pressure actuated.

Outlet Section

There are two choices for the outlet section. First is the standard choice(oil flow is directed to the tank when spools are in neutral and the A or B position). Finally is the power beyond choice(oil flow is directed to the power beyond port when spools are in the neutral position and back to the tank when spools are in the A or B position).