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Key Features
Description
The M20B is a compact steel relief valve for hydraulic systems, designed to safeguard circuits from overpressure. It comes in 1/4 and 3/8 BSPP sizes, rated up to 30 l/min and 350 bar. Multiple spring ranges allow versatile adjustment, while an optional tamper-proof cap enhances safety. Lightweight and robust, the valve delivers reliable overpressure protection in demanding environments.
Key Specifications
In stock
*Order by 3pm for Next Day Delivery
Couldn't load pickup availability
Technical Sales
Initially, with an IT background, I changed paths into the hydraulics industry in 2014. I started from the ground up in stores, gaining valuable hands-on experience modifying and building valves, developing an understanding of the full sales process from beginning to end, and quickly moving into sales and technical support.In 2020, I joined Approved Hydraulics, moving into a more commercially focused role. Working remotely as part of the sales team, I manage new and existing accounts and handle new enquiries. I hope we can continue to grow with our customers while maintaining a strong focus on dependable service and long-term customer relationships.
BSPP Relief Valve upto 30 L/min - Steel Body
Approved Hydraulics provides warranty coverage against defects in materials and workmanship under normal use for the periods below, subject to the conditions in this policy.
A. Two-year warranty (24 months)
A 2-year warranty applies to selected products or product lines as stated on the quotation, order acknowledgement, invoice, product datasheet, packaging or website.
B. One-year warranty (12 months) – conditional
A 1-year warranty applies to products not covered by the 2-year warranty, and/or to certain items where coverage is subject to conditions such as correct installation, commissioning, maintenance, and use (see Section 5).
Important: The warranty period that applies to a specific item is the one explicitly stated on the sales documentation or product literature for that item.
For full details visit our warranty page here
For all stock items and goods not requiring production.
Next Working Day Delivery (UK Mainland)
For full details view our shipping page here
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery
How key hydraulic components work and what they do.
Types of hydraulic cylinders?
Single-acting: Fluid acts on one side only; return is by gravity or spring.
Double-acting: Fluid applies force in both directions for extension and retraction.
Telescopic: Multi-stage cylinders offering long stroke in a compact design, often seen in dump trucks.
Types of hydraulic pumps?
Gear pumps: Simple, durable, and cost-effective. Good for low to medium pressure.
Vane pumps: Moderate complexity and efficiency; quieter than gear pumps.
Piston pumps: High-efficiency and high-pressure capable, used in demanding systems. Can be axial or radial type.
What is a check valve?
A one-way valve that allows fluid to flow in one direction and blocks it in the reverse direction. Used to prevent backflow that could damage equipment or disrupt operation.
What is a cylinder in hydraulics?
A hydraulic cylinder, also known as a linear actuator, transforms fluid power into linear mechanical motion. It’s used in applications like lifting, pushing, or clamping.
What is a directional control valve?
These valves direct fluid to specific paths in the system, enabling actuator movement. They can have 2, 3, or more positions and ports (e.g., 4/3 valve) to control flow direction and stop/start functions.
What is a flow control valve?
This valve regulates the flow rate of hydraulic fluid, controlling the speed of actuators. It may be fixed or adjustable, and can be pressure-compensated to maintain constant flow regardless of load.
What is a hydraulic motor?
A hydraulic motor does the reverse of a pump — it takes pressurised fluid and converts it into mechanical rotation. Used in winches, conveyors, and mobile machinery.
What is a hydraulic pump?
A hydraulic pump converts mechanical energy (from an engine or motor) into hydraulic energy by moving fluid through the system. It creates the flow necessary to transmit power, but it does not generate pressure by itself — pressure results from resistance to flow.
What is a pressure relief valve?
A safety device that limits the maximum system pressure. When pressure exceeds a preset limit, the valve opens to divert fluid back to the reservoir, protecting pumps and other components.
What is an accumulator?
A device that stores hydraulic energy in the form of pressurised fluid. It uses a gas (usually nitrogen) separated from the fluid by a bladder, piston, or diaphragm. Accumulators help smooth pressure spikes, maintain pressure, or provide emergency power.
