Safety valve maintenance:

For boilers with a rated steam pressure of 3.82MPa or less, the safety valve throat diameter should not be less than 25mm; for boilers with a rated steam pressure greater than 3.82MPa, the safety valve throat diameter should not be less than 20mm.

Safety valves should generally be equipped with exhaust pipes, which should run directly to a safe location and have an adequate cross-sectional area to ensure smooth exhaust flow. The bottom of the safety valve exhaust pipe should be fitted with a drain pipe connected to a safe location, and no valves should be installed on either the exhaust pipe or the drain pipe.

The safety valve for pressure vessels is ideally installed at a high position on the vessel itself. The safety valve for liquefied gas storage tanks must be mounted in the gas phase section. Generally, a short pipe can be used to connect to the vessel, in which case the diameter of the safety valve short pipe should not be less than the valve diameter of the safety valve.

(1) The through holes in the connecting pipes and fittings between safety valves and boilers or pressure vessels must not have a cross-sectional area smaller than that of the safety valve's inlet. If multiple safety valves share a common inlet pipe, the cross-sectional area of the inlet pipe must be at least the sum of the inlet cross-sectional areas of the safety valves.

(2) Generally, no stop valves should be installed between safety valves and the steam drums or headers of boilers, or between the safety valves and the steam extraction pipes. It is generally not advisable to install stop valves or other extraction pipes between safety valves and pressure vessels; for high and moderate hazards, it is easylPressure vessels containing flammable, corrosive, adhesive, or valuable media may be equipped with a shut-off valve between the safety valve and the pressure vessel only with the approval of the technical responsible person for pressure vessels of the using unit and the implementation of reliable preventive measures. During normal operation of the pressure vessel, the shut-off valve must remain fully open and sealed with lead or locked. The structure and bore of the shut-off valve, as well as the low-temperature safety valve, should not hinder the safe release of the safety valve.

Safety Valve Terminology:

1. Safety Valve: An automatic valve that, without external force, uses the inherent force of the medium to discharge a predetermined amount of fluid to prevent the system pressure from exceeding the pre-set safe value. Once the pressure returns to normal, the valve closes again to prevent further discharge of the medium.

2. Direct-acting pressure safety valve: A type of safety valve that uses a direct mechanical load, such as a heavy hammer, lever-weighted hammer, or spring, to overcome the force generated by the pressure of the medium below the valve disc.

3. Safety valve with power-assisted device: This valve can be opened below the normal operating pressure with the aid of a power-assisted device. Even if the auxiliary device fails, this type of safety valve still meets the standard requirements.

Basman Automation - Low Temperature Safety Valves are supplied by Suzhou Basman Automation Equipment Co., Ltd. Located at Room 642, Building 1, Shunda Business Plaza, Suzhou Industrial Park. Striving and developing amidst the surge of the market economy, Basman has gained a good reputation in sensors. Basman's nationwide achievement signifies that our service and management levels have reached a new height. All employees of Basman are willing to work with people of insight from all walks of life to develop together and create a better future.