What does a power beyond sleeve do?

The power beyond sleeve prevents subjecting the exhaust or return passages and spool seals of the control valve to back pressure. Note: since the return passage is blocked from normal outlet, it is necessary to provide an additional outlet which is to be hooked up to tank or reservoir.

How do you check a hydraulic valve?

The Cross computer stock number is stamped in the shaded area on the handle end of the valve body on recent valves. On older valves, the Z casting number is on the back which would tell you which series, but individual functions would have to be described.

What are hydraulic valves?

Hydraulic valves are mechanical devices that are used to regulate the flow of fluid within a hydraulic circuit or system. They can be used to completely close a line, to redirect pressurized fluid or to control the level of flow to a certain area.

How do you adjust a spool valve?

To adjust the spool valve, loosen the valve-locking nut on the side. Removing the locking nut gives you access to the adjustment screw. Turn the screw clockwise to raise the pressure, and twist it counter-clockwise to lower the pressure.

What does Pb mean in hydraulics?

When the valve spool is centered, the oil flows in the “P” pressure port and out the “PB” port. No flow flows out the tank port when the spool is centered.

What is a high pressure carry over?

Power beyond – also called high-pressure carry over (HPCO), is a facility on a mobile hydraulic directional control valve that enables the pressure gallery to be isolated from the tank gallery and be carried over to an additional valve – usually another directional control valve.

What does A and B stand for in hydraulics?

P is pressure inlet, A and B are utilization ports, TA and TB are return ports.

Can you adjust a relief valve?

Adjust the relief valve by turning the adjuster clockwise until the reading on the gauge builds to the pressure indicated on the machine drawings. This is what is known as the valve “cracking” pressure, which is the pressure at which the relief valve starts to open.

How do you adjust a main relief valve?

With a slotted screwdriver, turn the screw in the center of the knob clockwise, until flow can be heard escaping from the internal valve. Slowly turn the screw counterclockwise until the flow from the relief valve stops. Turn the screw an additional 1/8 to 1/4 turn counter-clockwise. Replace the silver cap in the knob.

What does a power beyond sleeve do? The power beyond sleeve prevents subjecting the exhaust or return passages and spool seals of the control valve to back pressure. Note: since the return passage is blocked from normal outlet, it is necessary to provide an additional outlet which is to be hooked up to tank or…