At present, China's boiler room commonly used in industrial boiler safety valve are: lever, spring, static weight, pulse and a variety of complex. Leveraged boiler safety valve lever safety valve is divided into single-lever and double-lever two. They are also known as heavy hammer safety valves because they balance the pressure of the steam (water) by acting on the spool through the moment of leverage and weight. Lever (hammer type) safety valve mainly by the valve core, seat, lever, hammer, limit devices and other components. It is the weight of the hammer, through the lever to the spool on the valve seat, move the weight of the position to change the size of the weight moment to adjust the relief valve opening pressure. When the boiler pressure exceeds the pressure at the top of the spool, the spool is lifted off the seat and the steam is vented. When the boiler pressure is lower than the pressure at which the hammer acts on the top of the valve plug, the valve spool falls and the boiler stops exhausting. This safety valve structure is simple, easy to adjust, reliable performance, so the boiler is quite common. General single lever safety valve for low pressure boilers, double lever safety valve for medium and high pressure boilers. Spring-type boiler safety valve Spring-type safety valve mainly by the valve core, seat, stem, spring, adjusting screws and other components. This safety valve is mainly the use of spring force, the spool pressure on the seat. When the boiler pressure exceeds the spring pressure in the upper part of the valve core, the valve core and the valve stem are jacked up and the steam is discharged. When the pressure of the boiler is lower than the pressure of the spring acting on the upper part of the valve core, The boiler stopped exhausting. Spool valve seat and the contact surface of the cone, the spool around the edge of a little out. When the steam valve top open, the valve core edge is also affected by the steam pressure, so that the entire role of a sudden increase in area, safety valve suddenly open; when the reduction of force, due to a sudden decrease in steam force, so that a closed spool, Prevent the valve core from beating repeatedly. The main parameters of the spring-loaded safety valve are the opening pressure and the exhaust capacity, while the exhaust capacity depends on the caliber of the valve seat and the lifting height of the valve core. Due to the different height of lift, it can be divided into three types of micro-type, medium type and full-type safety valve. Spring-loaded safety valve has the advantages of compact structure, small size and light weight. The tightness is good, the adjustment is convenient, the vibration can be tolerated, and there are few leaks. Therefore, sensitive and reliable. It is the most widely used, is the most commonly used one. Static weight boiler safety valve It is composed of the valve core, seat, ring iron, valve cover, anti-fly screws and other components. This safety valve is mainly the use of annular iron weight, the valve core pressure on the valve seat, when the boiler pressure exceeds the pressure on the role of iron in the valve core, the valve core is jacked up, steam discharge: the boiler pressure dropped to low In the role of iron in the upper spool pressure, the spool landing, stop the exhaust. Static heavy-duty safety valve structure is simple, easy to manufacture, but bulky bulky. Adjustment difficulties, low sensitivity, only applies to low-pressure small boilers. At present, China's industrial boilers rarely used. Pulsed boiler safety valve It mainly by the pulse spring safety valve, impulse catheter main safety valve and other components. Pulse relief valve works: When the drum or superheater pressure exceeds the specified value, the steam through the impulse conduit, the valve into the pulse spring safety valve, the valve top open, the pulse spring safety valve, the steam entered The upper part of the main safety valve piston, the piston moves down, open the main safety valve, the steam discharge pressure relief. When the pressure is restored to normal pressure, the pulse spring safety valve is closed and the steam in the upper part of the main relief valve piston is interrupted. The main relief valve spool is closed by the action of steam and spring. This safety valve device has an electrical control system as electrical protection. When the boiler overpressure, then, gas pressure gauge contacts closed, connected to the pulse spring safety valve solenoid, so that work, the valve open; when the pressure is too low back seat or the valve fails, you can also operate the electrical control Switch, turn on the solenoid coil, turn off the solenoid, the valve closed. This safety valve in operation impulse access catheter on the valve, to maintain the fully open state, which should be sealed. This safety valve is suitable for high pressure boilers. V. Composite Boiler Safety Valve Compound safety valve by the same or different from the safety valve into one, while connected to a valve seat, in order to reduce the number of openings.
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