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Safety valves

Safety valves

Safety relief valves are crucial for protecting plants from overpressure and the associated damage. They provide a safe working environment and ensure the reliable operation of your systems.


Choosing the right Safety relief valve requires specialist knowledge, paying attention to:
" Working pressure and setting pressure - For reliable protection within safe limits.
" Medium compatibility- To prevent wear and corrosion.
" Temperature and flow requirements - For efficient operation under all conditions.


At KLINGER , we offer high-quality solutions that comply with the most stringent standards, such as the Pressure Equipment Directive (PED) and EN ISO 4126. With our technical expertise and innovative products, we help you make the right choice, fully tailored to your specific needs.

KP-2051 Bronze
Threaded connection

KP-2008G Nod. cast iron
flange connection

KP-2008C Steel
flange connection

Additional information

(Spring loaded) safety valves

Frequently asked questions (FAQ)

What are spring safety valves?
Spring safety valves are automatic valves that are activated to discharge gases, steam or liquids from a boiler, pressure vessel or other system when pressure or temperature exceeds preset limits. These valves are specifically designed to open at a certain pressure and temperature, ensuring safety and preventing possible accidents or damage to equipment.
What is the primary role of spring safety valves?
The main function of spring safety valves is to regulate pressure within safe limits, preventing equipment damage and serious malfunctions. They play an essential role in protecting operating personnel and minimizing risks associated with overpressure
What types of spring safety valves exist?
Standard safety valve: This valve opens with a quick "plop action" and is sometimes referred to as a "high elevator" valve. Full Lift Safety Valve: Opens abruptly within a 5% increase in pressure after elevator has begun and quickly reaches full opening. Proportional Safety Valve: Opens gradually, in proportion to the increasing pressure, without sudden movements. Directly Loaded Safety Valve: Operates with an opening force below the valve disc, counteracted by a closing force such as a spring or weight. Diaphragm Safety Valve: Protects linear moving and rotating parts, as well as springs, from the influence of the medium by using a diaphragm. Bellows safety valve: Protects sliding, partially or fully rotating parts and springs from the impact of the medium by using a bellows.
How does back pressure affect spring safety valves?
Back pressure significantly affects both the opening and blow-off capacity of spring safety valves. Increased back pressure can increase the closing force, requiring a higher inlet pressure to open the valve. This therefore affects valve performance by potentially preventing the valve from opening at the correct time (process pressure/relief pressure), which can lead to improper system operation (excessive system pressure). The risk of overpressure or equipment/environment damage is increased if backpressure is not taken into account. It is therefore essential to take back pressure corrections into account when selecting and adjusting spring safety valves to ensure system safety and operation. Pressure balanced Safety relief valves with bellows can also be used to reduce the adverse effects of back pressure.

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