Product Information

Safety Relief Valves

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Safety relief valves are designed to be fast-acting components that protect systems with the potential for sudden pressure spikes. These valves may sit dormant for indeterminate amounts of time before needing to be used, so it’s crucial that they always work as intended. Our safety relief valves are available in low-leak and tight hysteresis configurations. To ensure reliable operation, we 100% test each component for crack, flow point and reseat pressure.

Our safety relief valves are available in 0.187, 0.250, 0.281 and 0.375 inch insert diameters and 0.687 inch threaded configurations. They are constructed entirely of stainless steel and are available screened and unscreened. Built-in damping ensures quiet operation. Cracking pressures ranging from 20 to 5900 psid.

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About us

Lee Products Ltd, operating in the UK since 1975, is a Buckinghamshire based company specialising in fluid control, precision and miniature components for many kinds of industries including aerospace, medical, printing and so on.

We have a parent company in the USA, The Lee Company, established in 1948. This means our expertise within this technology has been our trademark for many years, with a skilled and accomplished team of engineers at hand to resolve customer’s issues quickly and efficiently.

Precision Microhydraulics
With expertise in microhydraulics for over 60 years, our components solve the issues of weight and size. They start from a diameter of 0.01in to 1.0in and 0.1 to 28 grams.

Shuttle valves, safety screens, pressure relief valves, directional flow control, restrictors, plugs, check valves, flosert (pressure-compensated flow controls), solenoid valves, special products.

Electro-Fluidic Systems
Our product range has expanded and evolved for fluid and gas flowing systems regardless of how aggressive they are. Our components help turn fluid handling systems into reliable and efficient systems.

Non-inert solenoid valves two-way & three-way, inert solenoid valves two-way & three-way for aggressive chemicals, high speed solenoid valves, fixed and variable pumps, custom manifolds, piezo valves, static mixers, other products.

Since 1999 we have been granted accreditations such as ISO9002, ISO9001:2000 and ISO9001:2008. We are dedicated in bringing our customers only the best, most reliable, expert services and products. Please contact us to have any queries and requirements dealt with.

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Articles/Press Releases

24/08/2022 - Bypass safety screens protect critical components
In most flow control applications safety screens are acknowledged as being one of the most effective ways of protecting components from a few rogue particles.
23/08/2022 - Critical flow control just got easier, more efficient and cheaper
A new INTERNAL PINCH-TUBE SOLENOID VALVE which offers outstanding reliability and an exceptionally low carry-over volume of just 3.7 µL and low overall internal volume of just 11 µL.
22/08/2022 - High-performance maniature pump & control package
A new miniature positive displacement pump with integrated control electronics which offers unparalled flexibility in a small, lightweight package, is the latest innovation from miniature fluid control specialists The LEE COMPANY.
03/08/2021 - HPHT (High Pressure, High Temperature) Pumps
The Lee Company is excited to announce an addition to our positive displacement pump product line.
04/09/2019 - Innovative miniature solenoid valve offers high flow, low power, low leakage & long life
A new generation of versatile and innovative 3-port solenoid valves which offer the combination of high flow rates, low leakage and low power consumption in a miniature 10mm package have been introduced by miniature component specialists THE LEE COMPANY.
07/08/2019 - New insert retained option for HI-Bar Safety Screens
The established range of HI-BAR® Safety Screens available from miniature component specialists THE LEE COMPANY now includes an insert retained option for high pressure applications.
07/08/2019 - Technical Hydraulic Handbook packed with useful data
Miniature component specialists LEE PRODUCTS has recently published Edition 12 of its Technical Hydraulic Handbook a catalogue which embodies over 70 years of innovation in miniature fluid control.
07/08/2019 - Miniature 2-way inert solenoid valve for critical fluid control
Innovation in miniature continues to be the mission for THE LEE COMPANY proven by their ability to develop innovative miniature precision fluid control components.
23/08/2018 - New video showcases innovation in miniature by the Lee Company
Innovation in miniature is the title of a new video launched by The Lee Company, which can be viewed here: https://youtu.be/orKDklnodMA.
11/08/2017 - Pre-assembled plug for easier handling and installation
A pre-assembled plug which combines the benefits of easier handling and faster installation with the proven reliability and performance of Lee expansion plugs, was among the new products to be exhibited by LEE PRODUCTS at the recent Farnborough International Air Show.
11/08/2017 - Lee Hi-Bar Safety Screens in titanium for optimum strength to weight performance
Miniature component specialists LEE PRODUCTS are continually developing their field-proven range of HI-BAR Safety Screens in a range of materials to which is now added options made of Titanium.
10/08/2017 - Miniature PRI Pressure relief insert ensures zero leakage
A new miniature valve designed for protecting low pressure systems that need an over pressure safety relief valve that guarantees zero leakage, is the latest addition to LEE PRODUCTS range of field-proven miniature pressure relief valves.
25/08/2016 - Pre-assembled plug for easier handling and installation
A pre-assembled plug which combines the benefits of easier handling and faster installation with the proven reliability and performance of Lee expansion plugs, was among the new products to be exhibited by LEE PRODUCTS at the recent Farnborough International Air Show.
24/08/2016 - Slots versus holes improve flow through safety screens
Protecting components in critical fluids handling applications from the risks of blockages caused by unwanted contaminants is essential in helping to eliminate system failure and downtime.
03/11/2015 - Ultra-Compact, energy-efficient solenoid valves save space and reduce weight
Lee Products has recently extended its range of ultra-compact, field-proven piloting solenoid valves which are ideal for challenging, high pressure duty such as those occurring in aerospace hydraulics, fuel systems and oil tool applications.
24/08/2015 - Miniature, chemically inert stepper dispense pump
A miniature, chemically inert Stepper Dispense Pump which is designed to deliver variable micro-litre volumes in the 50µL to 250µL range with a consistent performance yet in the most compact package, has been introduced by LEE PRODUCTS.
24/08/2015 - Miniature inert solenoid valve protects sensitive fluids
Rapid and precise dispensing of aggressive and sensitive fluids is a critical requirement in many OEM applications and miniature component specialists LEE PRODUCTS have an outstanding reputation for developing solenoid valves which excel in these situations.
24/08/2015 - Robust, lightweight peek safety screens
Protecting sensitive components in critical fluids handling applications such as those occurring in the medical, scientific and aerospace industries is essential for safety and optimum performance.
19/08/2015 - Ultra-miniature Solenoid Valve Saves Space, Uses Less Energy
A new ultra-miniature, HDI (high density interface) 2-port latching solenoid valve which is ideal for OEM applications that demand ultra-low energy consuming components that generate minimal heat and are as compact as possible, is now available from LEE PRODUCTS.
16/07/2015 - Miniature Component Specialist makes Massive Investment
The value and success of the UK’s aerospace industry is well documented, currently worth around £20bn to the UK manufacturing economy and employing around 270,000 people.
05/08/2014 - Miniature Burst Disc Plugs Provide Over-Pressure Protection
Reliable and effective over pressure protection is essential for many critical liquid and gas flow control systems across many applications and the new Burst Disc Plugs, available from LEE PRODUCTS are an ideal solution.The Lee Burst Disc Plug provides reliable, high-pressure relief in a leak-tight, corrosive resistant, standard miniature package measuring just 13.5mm x 17.3mm, with special sizes as small as 6.4mm x 9.4mm.
05/08/2014 - Miniature Zero Leak Check Value for Critical Flow Control
Critical flow control systems in high-technology engineering applications, such as those designed for fuel lines in aviation, Formula One™ motorsport and the oil industry, increasingly require components which provide the highest levels of performance and reliability in the smallest, lightest package. To meet these demands, LEE PRODUCTS, innovators in miniature components, has recently extended its range of flow control products with the introduction of a new 375 Zero Leak Check Valve.
08/10/2013 - Plug-In, 2 Port HDI Soleniod Valve is Lighter and Smaller
A new ultra-miniature, high density interface (HDI) solenoid valve for OEM, laboratory, scientific and medical device applications is the latest example of excellence in miniature engineering from LEE PRODUCTS.
20/08/2013 - Lee Products launch new website
Miniature component specialist Lee Products has launched an all-new website which showcases its range of high precision miniature components for a wide range of applications including aerospace, medical and scientific instrumentation, diagnostics, ink-jet printing, industrial gas turbines, racing cars and oil exploration.
05/04/2013 - New EFS Handbook published by Lee Products
Miniature component specialists Lee Products have recently published a new EFS, (Electro Fluidic Systems), technical handbook, which provides a valuable resource of product information, along with practical engineering reference material.
20/03/2013 - High Pressure 281 Flosert from Lee Products
Lee Products’ new High Pressure 281 Flosert is the latest addition to Lee’s line of miniature flow regulating valves. These valves are pressure compensated to provide a constant flow over a wide range of pressure differentials.
20/03/2013 - 281 PRI / Chek Valve from Lee Products
Lee Products’ new 281 PRI/Chek Valve combines the function of a pressure relief valve in parallel with a check valve into one easy to install insert.
07/12/2012 - Lee Products Hard Seat Micro-Dispense Valves for aggresive fluid handling
An addition to its established range of VHS Solenoid Valves, Lee Products new Hard Seat VHS Micro-Dispense Valves offer repeatable and precise non-contact dispersement of nonolitre to microlitre fluid ranges.
07/12/2012 - Catch-All™ Safety Screens are compact and robust yet ultra-fine
Miniature component specialist Lee Products new Catch-All™ Flange Mount Safety Screens integrate a higher level of ultra-fine filtration into a compact, rugged, flange mount design.
23/10/2012 - Extreme application Safety Screens from Lee are NACE compliant
Lee Products, the miniature somponent specialist, has introduced a new tange of flange mount Safety Screens, made entirely of MP35N nickel cobalt based alloy.
20/06/2012 - High Pressure Micro Solenoid Valve for completion tools in oil wells
Miniature component specialists LEE PRODUCTS have developed a reduced diameter solenoid valve which will help oil tool designers meet the challenges of incorporating all the required components into the smallest space envelope.
11/05/2012 - New PRI/Chek Valve from Lee
Lee Products new 375 PRI/Chek Valve combines the function of a pressure relief valve in parallel with a check valve into one easy to install insert.
15/03/2012 - Lee inert Solenoid Pump sets new standards in design flexibility
The twin objectives of greater design flexibility and significant cost savings apply to many manufacturing applications and perhaps none more so than the medical and scientific industries. With this in mind miniature component specialists Lee Products are continually developing high precision products to help designers and machine builders achieve their goals.
06/10/2011 - New CB Solenoid Valve from Lee
The new CB Solenoid Valve from Lee Products is economically designed, utilizing a cartridge bobbin coil coupled with our unique MultiSeal™ technology.
06/10/2011 - New Bypass Valve from Lee
Lee Products have launched a new Bypass Valve designed to shunt flow across an actuator piston when system pressure is either lost or shut off.
07/09/2011 - New Pressure Relief Valve from Lee
The new 250 PRI pressure relief valve is the latest addition to Lee Products range of miniature pressure relief valve inserts.
31/05/2011 - Nace compliant check valves handle high pressures
A new range of high pressure check valves which are compliant with NACE material standards (National Association of Corrosion Engineers), have been introduced by miniature component specialists LEE PRODUCTS.
24/02/2011 - Less is more with Lee ultra compact Solenoid Valves
A high density solenoid valve which offers the features of a large valve, combined with superior performance, yet in an ultra-compact design weighing just 4.5 grams, has been introduced by Lee Products. The latest version of the Lee (HDI) valve is a Lo-Lohm model that delivers increased flow capacity whilst helping engineers and OEM designers to meet the familiar objectives of ‘make it smaller, lighter, more efficient, without increasing overall size and weight’.
07/01/2011 - Lee Products are the force behind new Formula 1 wings
The fast moving world of Formula 1 motor racing technology is constantly changing as a result of the desire to gain an advantage in such a highly competitive arena, as well as the need to comply with ever-changing rules and regulations.
14/07/2010 - New website features miniature industrial components from Lee Products
Pioneering the design and manufacture of high precision miniature components which are used in industries such as automotive, industrial hydraulics and medical & scientific instrumentation, is the speciality of The Lee Company.

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Latest Reviews

Lee Products Ltd

Nice.

By Peter Sparkes - 25 August 2023

Lee Products Ltd

Good place.

By my songs sparkes - 23 August 2022

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Company details for Lee Products Ltd

Lee Products Ltd