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What Should Be Paid Attention To When Installing And Maintaining The Safety Valve
Nov 29, 2018

What should be paid attention to when installing and maintaining the safety valve

All safety valves should be installed vertically. There should be no resistance at the exit of the safety valve to avoid pressure. The safety valve should be specially tested before installation and checked for its official seal. The safety valve in use should be inspected regularly. The following is a simple understanding of the spring-type safety valve installation should meet the requirements.

(l) For boilers with a rated evaporation of more than 0.5t/h, install at least two safety valves: boilers with a rated evaporation of less than or equal to 0.5t/h, with at least one safety valve. Safety valves must be installed at the outlet of the split economizer and at the outlet of the steam superheater.

(2) The safety valve should be installed vertically at the highest position of the potter and the header. Between the safety valve and the drum or header, the outlet pipe and valve for steam should not be installed.

(3) The lever type safety valve shall have a device for preventing the weight from moving by itself and a guide for restricting the deviance of the lever. The spring type safety valve shall have a device for lifting the handle and preventing the adjusting screw from being twisted.

(4) For boilers with rated steam pressure less than or equal to 3.82 MPa, the safety valve throat diameter shall not be less than 25 mm: for boilers with rated steam pressure greater than 3.82 MPa, the safety valve throat diameter shall not be less than 20 mm.

(5) The connecting pipe of the safety valve and the boiler shall have a sectional area not less than the inlet cross-sectional area of the safety valve. If several safety valves are installed together on a short pipe directly connected to the drum, the cross-sectional area of the short pipe should not be 1.25 times that of all safety valves.

(6) Safety valves should generally be equipped with exhaust pipes. The exhaust pipes should be straight to a safe place and have sufficient cross-sectional area to ensure unobstructed exhaust. The bottom of the safety valve exhaust pipe should be fitted with a cavity. The drain pipe is connected to a safe place. No valves are allowed on the exhaust pipe and the drain pipe.