1PCS For SV38-38-0-N-00 cartridge valve SV38-38

Hydraulic Component · Cartridge Valve · SV38-38 · Screw-In Type · In stock

What Is the SV38-38-0-N-00 Cartridge Valve?

The SV38-38-0-N-00 is a screw-in hydraulic cartridge valve — a self-contained valve element that threads into a machined manifold cavity (typically an SAE or ISO standard cavity) to perform a specific hydraulic function: directional control, pressure relief, flow regulation, or check (non-return). Cartridge valves are the building blocks of modern compact hydraulic systems — instead of plumbing individual line-mounted valves together with hoses and fittings, multiple cartridge valves are screwed into a single manifold block that contains all the internal fluid passages. This dramatically reduces size, weight, potential leak points, and assembly labor.

In short: This is a replacement hydraulic cartridge valve, model SV38-38-0-N-00. If a function on your hydraulic manifold has stopped working — a cylinder will not extend, a motor will not turn, system pressure is incorrect — and you have isolated the fault to a specific cartridge valve cavity, this is the replacement element.

Cartridge Valve Replacement — Critical Precautions

1. Confirm Complete Model Number Match

The full model code "SV38-38-0-N-00" encodes the valve size, function, pressure setting, and seal material. Every character matters. An SV38-38 with a different suffix may be a completely different valve function — a pressure relief valve vs. a directional valve vs. a flow control. Always match the complete model code, not just the "SV38-38" prefix. The model code is typically engraved or printed on the valve's hex body.

2. Depressurize and Lock Out Before Removal

Hydraulic systems store energy in accumulators, compressed fluid, and suspended loads. Before removing any cartridge valve: (a) shut down the hydraulic power unit and lock out/tag out the electrical supply, (b) bleed residual pressure by operating all directional valves through their full stroke multiple times with the pump off, (c) verify zero pressure at gauge ports in the manifold, (d) mechanically support any suspended loads (cylinders with gravity-loaded rods). A cartridge valve ejected by residual pressure can cause serious injury and release a high-velocity stream of hot hydraulic oil.

Key Specifications

Frequently Asked Questions

How do I remove a stuck cartridge valve without damaging the manifold cavity?

Cartridge valves have a hex body for a deep-well socket. Use the correct size 6-point socket (not a 12-point, which rounds the hex corners under high torque). If the valve is stuck: apply penetrating oil around the thread joint and let it soak for several hours, use a heat gun to warm the manifold around the cavity (not the valve itself — thermal expansion of the manifold material will loosen its grip on the valve threads), and apply torque smoothly (not with an impact wrench, which can shear the valve body). If the hex rounds off, stop immediately — a damaged hex may require machining the valve out, which risks the manifold cavity threads.

Do I need to replace the O-rings and backup rings when installing a new cartridge valve?

Yes — always. The sealing elements (O-rings, backup rings, and any Teflon seals) are the primary barrier between high-pressure hydraulic oil and the outside environment. Old seals take a compression set over time and will not reliably re-seal if removed and reinstalled. The new cartridge valve should come with its own seals installed. Before installation, lubricate the seals with clean hydraulic oil or assembly lubricant to prevent tearing during insertion. Never install a cartridge valve with dry seals.

What is the difference between a cartridge valve and a standard inline valve?

An inline valve is a self-contained assembly with its own body, ports (typically threaded for fittings), and internal valve element. It is connected to other system components with hoses or tubing. A cartridge valve is just the internal valve element — it has no external body of its own. It threads into a precision-machined cavity in a manifold block, and the manifold block provides the fluid passages (drilled galleries) that connect it to other cartridge valves and to the system ports. Cartridge systems are more compact, have fewer potential leak points, and are easier to service (unscrew one valve, screw in the replacement). The trade-off is that the manifold must be engineered for the specific combination of cartridge valves it hosts.

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