Safety valves are a type of valve that is used as an integrated part of a system such as a pressure vessel, boiler, or other configuration in which if the pressure or temperature exceeds its deciding limits, the safety valves effectively reduce the pressure or temperature by releasing substances from the system. The safety valve is often used to safeguard equipment.

  • It is utilized in industrial and commercial applications for air, steam, liquids, and gases.
  • When opposed to relief valves, safety valves may open quite rapidly. A safety valve opens from a preset pressure; the valve initially opens slightly, then completely, to eliminate undesirable pressure from the system as rapidly as feasible.
  • Safety valves are used to avoid pressure spikes that may otherwise result in malfunctions, fire dangers, or explosions. Because safety valves have just mechanical components, they are employed when electrical or pneumatic safety mechanisms fail. The system media completely actuates a safety valve, keeping it operational in the event of a power outage.

What is the function of safety valves?

A safety valve is installed to prevent damage to the system from excessive pressure. When the pressure rises over the MWAP or beyond the safe operating range, we say that the system is under overpressure. When opposed to relief valves, safety valves can release pressure rapidly. Once the pressure reaches the safety valve’s opening point, the valve will partially open, and then completely open, allowing the excess pressure to escape the system as rapidly as possible.

Pressure rises may cause malfunctions, fires, or explosions, all of which can be avoided with the use of safety valves. When other forms of fail-safe protection, such as electrical or pneumatic devices, are not available, safety valves may be employed instead. In the event of a power outage, the system’s media will completely activate a safety valve.

The technician may open the valve manually or automatically. If manually opened, it will open when the pressure goes below a particular threshold and stay closed until pressure increases again. Pressing a button in front of it manually closes it. This button also releases the safety valves.

Important Things to know about safety valve


  • Excess pressure over the safety valve’s fixed pressure.
  • Under normal operating circumstances, the operating pressure is the pressure at which the system operates.
  • The pressure at which the disc starts to lift and the safety valve opens is referred to as the set pressure.


  • The distance traveled by the disc from its closed position to the position necessary for discharge.


  • The pressure that builds up at the safety valve’s exit during flow. Backpressure is equal to the sum of built-up backpressure and superimposed backpressure.
  • Backpressure that has built up: The pressure at the outlet after the safety valve has been opened.

Backpressure superimposed:

  • The pressure at the exit of a closed safety valve.

Maximum allowed working pressure (MAWP):

The maximum permitted pressure under normal operating circumstances at a certain temperature. MAWP is the maximum pressure that the pressure device’s weakest component can withstand.

The difference between the real pressure at which the disc lifts and the actual pressure at when the valve shuts are referred to as the blowdown. It is usually stated as a percentage.

The pace at which the safety valve may discharge excess pressure is referred to as its blow-off capability.

Safety valve types:

Safety valves, in general, are pressure relief valves.

 Relief valve:

it is intended to alleviate excess pressure to prevent the system from failing. It is often utilized in liquid systems. It’s also found in pumped systems.

Safety valve:

used with compressible gases, primarily steam and air. They are used to preserve the plant and keep the produce from spoiling. `

Safety relief valve:

it may be used in both gas and liquid systems.

Design of a safety valve

The design of safety valves varies depending on the use. For example, in compressed air systems, the safety valves do not have an exit connection and the liquid is vented straight into the atmosphere. The valve pattern has a right-angle body. It has a nozzle [full-nozzle or semi-nozzle] for the intake connection and a screwed or flanged outlet connection. Safety valves may have hoods or adjustable blowdown rings, depending on their use. Dimensions, capacities, and inlet-outlet connection sizes may all be customized.

Safety valve prices

Our safety valves are available at the most competitive prices. We have created an economical variety of safety valves to give high-quality goods at an industry-leading price.

Assurance of quality

We conceived and developed a highly dependable variety of safety relief valves after carefully considering all risk factors in the application area. Our research and development division’s most qualified personnel have created an excellent range of safety relief valves that have proved most beneficial to our respected clients.

For the manufacturing of the safety relief valves, we strictly adhere to international regulations and requirements. Our seasoned staff of specialist engineers oversees every stage of manufacturing, from raw material procurement to the final shipment of finished goods.

Services of safety valves

Industrial settings are the most common users of safety valves, which prevent damage from occurring due to excessive pressure. This excess pressure has the potential to cause accidents such as fires and explosions. Common places to find a safety valve are:

  1. It’s a business related to oil, gas, and petroleum. Equipment failure can cause fires or explosions, so a safety valve must release the hazardous material.
  2. In the energy industry. Overpressure in steam, air, gas, or liquid pipelines, or vessels/boilers, may be safely released with the help of these devices.

Do Safety Valves and Relief Valves Differ?

Both phrases relate to pressure-releasing valves, although their technical meanings vary. Relief valves are used to regulate pressure in pressurized systems for optimum operation. Relief valves prevent system breakdowns and overpressure equipment.

Safety valves safeguard people, property, and processes from pressure. The safety valve is a failsafe, the last resort valve that releases pressure to avert a disaster when all other relief valves fail to manage system pressure.

When should you use the safety valves?

One of the main reasons these valves are installed is for safety purposes. In an emergency, they release pressure rather than contain it. If a valve fails, it will open and close on its own to prevent water from leaking outside the system. The most common form of safety valve used in homes and workplaces is a pressure relief valve.

Why GMK safety valves?

GMK safety valves are up to the mark. They have a vast variety of safety valves of premium quality.

Closed Spring Loaded Low Lift Type High-Pressure Safety Valve

The GMKS Closed Spring Loaded Low Lift High-Pressure Safety Valves are employed for a wide variety of apparatuses & pipelines, including those that transport air, N2, H2 mixed gas, water, and others. For rusted gas and liquid equipment and pipelines, they’re used below 200°C. Add pressure protection. JB/T2769-92 specifications for the dimensions of the flanges. When the temperature of the equipment or pipeline is lower than 300 degrees Celsius, a low lift closed spring-loaded High Voltage Safety Valve is the kind of safety valve that should be used.

Liquefied Petroleum Gas, Back-flow Safety Valve

GMK has a well-deserved reputation for quality among its clientele and a history of success in creating and delivering its products or services.

The LPG liquid phase exit pipe is equipped with a back-flow safety valve to prevent any accidental backflow of the gas. This valve operates between -40 and 80 degrees Celsius. A liquefied petroleum gas flow may be automatically reversed and sent back to the tank if the pressure differential between the input and output is more than 0.5 MPa. Equipment or pipelines transporting LPG or similarly non-corrosive media need a safety valve because of the operational temperature range.


The safety valve is there as a last resort to prevent injury or damage to property in the event that the system fails to maintain safe pressure levels in the tank. Each tank’s safety valve may be found at the very top, and its operation is handled by a lever on the right side of the tank. By depressing the lever, the pressure may be released to a safe level. Because GMK is passionate about your safety, they have made sure to provide the highest quality safety valves. T