the choice of the relief valve

1) lever and weight safety valve: is the use of heavy hammer the moment balance of medium pressure, according to the size of the constant pressure to determine the quality of heavy hammer and the length of the lever, the valve plate can automatically open under the specified working pressure. After adjustment, in order to prevent others touch, must use tin box cover. The relief valve can only be fixed on the equipment, heavy hammer itself is generally not more than 60 kg weight, in order to avoid operating difficulties. Lever and weight safety valve made of cast iron materials suitable for nominal pressure no greater than PN16, medium temperature ts200 ℃ working conditions. Carbon steel materials to make the lever and weight safety valve is suitable for the nominal pressure no greater than PN40, medium temperature ts450 ℃ working conditions. Lever and weight safety valve is mainly used for water, steam and other working medium.

(2) the spring load safety valve directly: is the use of force to balance the internal pressure of the spring preload, adjustment, according to the constant pressure of the identified values, using a wrench, Some relief valve with a wrench or adjust the ring, for checking and adjusting) Adjusting nut to change the spring pressure on the valve disc, the Industrial Valves plate can automatically open under the specified working pressure. For spring safety valve, all must also adjust their internal nozzle height.

after adjust, in order to prevent others touch, must be seal. Spring load directly safety valve has closed and not closed two, inflammable, explosive or toxic medium chosen commonly enclosed, steam or inert gases can choose not enclosed. The valve spring safety valve with a wrench, direct load without a spanner. The effect of spanner is to examine the sensitivity of the disc. The steam with one of the requirements of safety valve is to prevent spring is overheating. Due to the discharge valve and make the spring temperature can reduce the strength of the spring and so reduce the valve set pressure, until spring return to normal operating temperature. For this reason, this kind of valve bonnet usually opens the window there is a big, to make the single coil cooling by the surrounding air. But the cover with the body cavity is usually below

is not sealed, so part of the discharge of steam escaped through the open cover.

when used for steam, often using a lantern type spool cover off from the body.

3. Pilot operated relief valve: it is a kind of relying on the pilot valve discharge medium to drive or control valve, the pilot Industrial Valves itself should be meet the requirements of the standard load safety valve directly. Due to the pilot operated relief valve, main valve usually use working medium pressure load, the load size is not restricted, and thus can be used in the occasion of high pressure and large diameter. Pilot operated relief valve used in petroleum, chemical and nuclear power equipment line.

(4) is used as the safety valve of caustic, flammable and toxic medium: unlike ordinary relief valve, corrugated pipe to replace the commonly used packing seal, usually using the spring type safety valve. Body with stainless steel ( In 304, 316) , disc ( 316316 l) , the relief valve can be used for medium temperature does not exceed 50 ℃. Emissions of medium or closed systems with special collector to collect.

blasting diaphragm urgently when used to produce abnormal high pressure in discharge medium. It is an auxiliary device, can not replace relief valve. After the blasting device of diaphragm in diaphragm must be replaced. Blasting diaphragm can use metals ( Corrosion resistant steel, etc. ) Or non-metallic materials ( Carbon fiber) Manufacturing. In order to improve the sensitivity of the device and ensure enough capacity after diaphragm blasting, can take use of pricker or blade method, starts to make diaphragm stamp on the needle or the blade; Or is used by a thin film or piston drive the cutting device.

carbon fiber membrane has the characteristics of high corrosion resistance, accurate action. Due to carbon fiber membrane with brittle, so the protection of the diaphragm, wrapped in a hole ( Mesh frame) On the diaphragm failure graphite flake was shattered from the mesh.

5. The selection of the relief valve requirements: when choosing safety valve, usually determined by the operating pressure of the relief valve nominal pressure, use temperature range is determined by the operating temperature of the relief valve, relief valve set pressure value calculated by spring or lever regulating range, determined according to the working medium material and structure form of the relief valve, according to the calculated emissions of the relief valve, safety valve nozzle area or nozzle diameter, to select the relief valve type and number.

spring safety valve directly load level of work pressure - such as table 2 Level 5, a total of five kinds of work pressure. When the choice, in addition to indicate product model, name, medium, temperature, should also indicate the pressure level of the spring.

Over the years, has become very popular as more and more people are trying it out.
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