// Catalogue

Pressure Control Valves for Reducing, Sequencing, Counterbalance, and Unloading

Pressure control valves manage the pressure inside part of a hydraulic circuit. They hold a lower pressure in one branch, time one action after another, or keep a load from running away. TSA Hydraulics Engineering supplies them within the Pressure & Flow family of our Valves range.

Counterbalance valves come with pilot ratios such as 3:1 or 8:1, and that number matters. Pick the wrong ratio and a crane boom shudders on the way down, or a machine burns power holding its load. Send us the model code and setting, and we will match a factory original or an equivalent with the same ratio.

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// Buying guide

How Pressure Control Valves Work

Every valve in this family balances hydraulic pressure against an adjustable spring. When the pressure reaches the spring setting, the valve moves and changes the flow path. The job a valve does depends on what it changes and where it senses pressure.

The Four Main Types

Pressure Reducing Valves

A reducing valve holds a lower, steady pressure downstream, even when the main system runs higher. It is normally open and closes as the downstream pressure rises. Typical uses include clamping circuits, pilot supplies and any branch with lower rated parts. Most need a drain line back to tank. In air systems, a pressure regulator does the same job.

Sequence Valves

A sequence valve is normally closed and opens only once the pressure at its inlet reaches the setting. It lets one action finish before the next begins, such as clamping a part before a drill or press moves in. Many include a built in check valve for free return flow.

Counterbalance Valves

A counterbalance valve holds a load in place and lets it move only when the circuit drives it, stopping it from free falling or running ahead. It mounts as close to the cylinder or motor as possible. These valves are standard on cranes, booms, lifts and winches.

Pilot ratio is the key detail:

Low ratio, such as 3:1: smooth and stable. Best for loads that change a lot or bounce.
High ratio, such as 8:1: more efficient, wasting less power. Best for steady loads.

The setting is usually about 1.3 times the highest load pressure, but always follow the maker’s guide.

Unloading Valves

An unloading valve lets the pump idle at low pressure once a set pressure is reached, often when an accumulator is charged. In high-low circuits, it unloads a large pump at high pressure and leaves a small pump to hold the load. Both uses save energy and cut heat.

Counterbalance or Pilot Operated Check?

A pilot-operated check valve holds a load firmly, but it can let a running load jump or chatter as it lowers. A counterbalance valve controls the load all the way down. For smooth lowering of heavy or overhauling loads, a counterbalance valve is usually the safer choice.

Setting Tips

Set reducing and sequence valves with a gauge on the controlled side, not the main line.
Never set a counterbalance valve below the load pressure, or the load will creep down.
Lock every adjuster once it is set, and record the setting.
Check that the main relief valve is set above all of these valves.

Pressure Control Valves Specifications to Check

Function: reducing, sequence, counterbalance or unloading
Pressure range and current setting
Pilot ratio on counterbalance valves
Drain arrangement: internal or external
Mounting: cartridge cavity, inline, modular or subplate
Flow rating and seal material

Why Buy From TSA Hydraulics Engineering

As a pressure control valves supplier, we match the function, setting, pilot ratio and cavity, so the machine behaves exactly as it did before. You get clear prices in AUD, OEM or equivalent options, and help sourcing pressure control valves replacement parts such as cartridges, seal kits and springs. We tell you upfront whether a valve is genuine or an equivalent.

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