Hydraulic Check Valves and Locks (Check Valves)

Safety and directional control. We offer a wide range of check valves (one-way) and controlled check valves ("hydraulic locks"). Essential for protecting pumps against pressure surges and maintaining cylinders in a constant position under load. Guaranteed tightness and long service life.
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  • Zawór cit-06

    Hydraulic check valve CIT-06

    Hydraulic check valve CIT-06
    52,31 zł
  • Zawór cit-04

    Hydraulic check valve CIT-04

    Hydraulic check valve CIT-04
    36,22 zł
  • Zawór cit-03

    Hydraulic check valve CIT-03

    Hydraulic check valve CIT-03
    25,48 zł
  • Zawór cit-02

    Hydraulic check valve CIT-02

    Hydraulic check valve CIT-02
    18,78 zł

Check Valves in Power Hydraulics - Flow Guards

A check valve is one of the simplest, yet most important, components of a hydraulic system. Its primary function is to allow oil to flow freely in one direction and completely block it in the opposite direction . In this category, you'll find solutions that protect your machinery from failure and uncontrolled movement.

Types of valves in our offer

To make the choice easier, we have divided the range into two main functional groups:

1. Straight check valves (Linear / Screw-in)
These are classic "one-way valves." They operate automatically under the influence of fluid pressure.

  • Application: Protecting the hydraulic pump against sudden pressure surges (e.g. when switching off the machine), preventing oil lines from emptying ("airlocking"), forcing one direction of circulation.
  • Parameters: Standard opening pressure (so-called cracking pressure ) is usually around 0.5 bar , which allows free flow with minimal energy loss.

2. Controlled check valves (so-called "Hydraulic Locks")
This is an advanced version of a check valve that normally blocks flow in one direction, but can be opened by a pressure signal (pilot) from another part of the system.

  • Versions: Single (blocks one port) and twin (blocks both actuator ports - A and B).
  • Application: They are absolutely essential where the cylinder must hold a load in a fixed position for a long time without dropping (e.g., crane supports, excavator booms, hydraulic presses). They act as an emergency brake – if a hose bursts, the lock will lock the oil in the cylinder, preventing the load from falling.

Features of our products

  • High tightness: The mushroom or ball design ensures almost zero internal leakage (drip tightness).
  • Pressure resistance: Bodies made of high-quality galvanized steel can withstand working pressures of 300-350 bar .
  • Versatility of connections: We offer valves with inch (BSP) threads from 1/4" to 1" and metric threads, which allows for easy installation in any system (directly on the actuator or on the in-line pipe).

How to choose a check valve?

When choosing, pay attention to:

  1. Flow (l/min): The valve must not throttle the pump. Select a model with a flow rate equal to or greater than your pump's capacity.
  2. Opening pressure: Standard is 0.5 bar, but versions with a stronger spring (e.g. 3-5 bar) are also available, which can act as pre-pressure valves.
  3. Function: If you only want to force the direction, choose a standard check valve. If you want to lock the actuator under load, choose a hydraulic lock .

FAQ: Hydraulic Check Valves and Locks
1. What is the difference between a regular check valve and a hydraulic lock (twin check valve)?

Although both have a safety function, their operation differs significantly:

  • Regular Check Valve: Works like a tire valve. It allows oil to flow freely in one direction and immediately blocks it in the other. It is most often used to protect pumps against back pressure surges.
  • Hydraulic Lock (Twin-Controlled Check Valve): Blocks oil flow in both directions, "freezing" the actuator in a fixed position. It opens and allows oil return only when pilot pressure is applied to the other line from the distributor.
2. Why does the loader arm (Tura) or baler sag under load and will a hydraulic lock solve this problem?

Yes, that's the main purpose of a hydraulic lock! The actuator sagging under load is most often caused by natural, minimal internal leakage in the distributor (solenoid) slide. Because the slides require play to move, they are not 100% leak-proof.
The hydraulic lock tightly shuts off the supply and return lines directly at the cylinder , eliminating the impact of a leaky distributor. This keeps the load elevated, ensuring complete operational safety.
3. Where and how to properly install a hydraulic lock?

For maximum safety, the hydraulic lock (controlled check valve) should be mounted as close as possible to the actuator , preferably directly on its connections using hollow screws (so-called banjo connections) or rigid steel tubes.
Why is this so important? If you mount the lock close to the distributor and the flexible hose between the lock and the cylinder breaks, the load will still drop rapidly. Mounting it directly on the cylinder (so-called hose rupture valves) ensures that the machine will be locked in place in the event of a hose failure.
4. What is the opening pressure (Cracking Pressure) in a check valve?

Opening pressure is the minimum pressure the pump must generate to overcome the spring resistance inside the valve and "open" the oil flow. In standard spring-loaded check valves available from BRhydraulic, this pressure is typically between 0.5 bar and 2 bar . This value is low enough to cause no noticeable power loss in most agricultural and industrial systems.
5. How do I choose the right size check valve or lock for my system?

The key parameter is not the operating pressure (most valves withstand 250-350 bar), but the maximum oil flow (l/min) .

  • A valve that is too small will act as a choke – the oil will be forced through at enormous speeds, which will lead to drastic heating of the system and a drop in efficiency (so-called pressure loss).
  • Always select threads (e.g. 3/8", 1/2", 3/4") and nominal valve flow so that it is equal to or slightly greater than the maximum capacity of your hydraulic pump.

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