Spring slightly open safety valve

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First, product outline: A27H series spring micro-open safety valve is suitable for equipment or pipe…

Productoverview:
A27H series Spring micro open type safety valve Suitable for the work temperature are less than 200 of the water, air, steam and other media of the equipment or pipeline. A27Y is suitable for the work temperature are less than 200 corrosion of the equipment or pipeline, as the overpressure protection device.
Two, work principle:
A27H series Spring micro open type safety valve In order to prevent pressure equipment and containers or containers can lead to increased pressure or internal pressure exceeds the limit of the burst of the safety device. Safety valve is a pressure system of pressure vessel, boiler, pressure pipeline using a wide range of safety devices to ensure the safe operation of pressure systems.
When the tank pressure exceeds the design requirements, the valve automatically opens, exhaust gas pressure reduction over the vessel to prevent or pipeline damage. When the pressure inside the container to normal operation when the pressure container is automatically turned off to avoid overpressure discharge of all gases, resulting in waste and production interruption.
Spring micro open type safety valve mainly comprises a valve seat, the valve spool and the loading mechanism is composed of three parts. Some of the valve seat and valve body as a whole, some and the valve assembly together, it is connected with the equipment.Often associated with valve stem, it is closely linked to the seat. The above is a disc loading mechanism, the size of the load can be adjusted. When the equipment inside the pressure within a certain pressure range, the internal medium acting on the valve flap is less than the force above the loading mechanism and the valve above, the difference is formed between the valve and valve seat sealing force, squeeze the valve seat, the media can not be discharged equipment. When the equipment inside the pressure exceeds the pressure of work and achieve the safety valve opening pressure, the internal medium acting on the flap above downtown the force is greater than the loading mechanism applied on top of it, then leave the seat valve, safety valve opens, equipment in the medium is discharged through the valve seat, if the safety valve displacement is greater than the equipment the safety discharge device, pressure is gradually decreased, and the exhaust through a short time, the pressure is reduced back to normal working pressure. The pressure acting on the valve flap is less than the force above the loading mechanism applied on top of it, valve and close pressure valve seat, the media to stop discharge, equipment to maintain the normal working pressure to continue running. So, the safety valve is the valve on the fluctuation of medium force and loading force, self closed or open in order to achieve the purpose of preventing over pressure device.
Three, Spring micro open type safety valve Structural characteristics:
1, spring micro open type safety valve has the advantages of simple structure, good sealing performance, accurate open pressure, discharge capacity, back seat pressure difference is small, easy to adjust. 2, nozzle type seat: the seat for a cut nozzle seat that reaches the speed of sound at the outlet of the steam flowing through the valve, discharge coefficient, surfacing Stellite seating, erosion abrasion resistance, long service life. 　　
3, thermal elastic disc: disc design for thermal elastic structure, using the medium pressure tiny deformation, improve the sealing ability, overcome the safety valve setting of the pressure is near before discharge phenomenon in the medium pressure. The valve sealing surface using advanced laser quenching technology, improve the hardness, wear resistance, impact resistance. 　　
4: by adjusting the adjusting nut adjusting nut, adjust the amount of compression spring, the valve can conveniently and quickly get accurate setting pressure. 　　
5, the back pressure adjustment set: auxiliary mechanism adjustment valve back pressure, through adjusting the back pressure adjustment, can get the right back seat pressure. When raised, the back pressure reducing valve. Cut, make the valve back pressure increased. 　
By four, micro spring open safety valve:
Nominal pressure is determined by the operating pressure of the safety valve, temperature determined by the operating temperature range of safety valve, the constant pressure value of constant pressure spring or lever determine the scope of the calculated safety valve, according to the decision to use media materials and structure type safety valve, safety valve leakage calculated safety valve throat according to the size of. The following general rules for selection of safety valve.
1, hot water boiler is not closed with the general use of micro open type safety valve wrench.
2, steam boiler or steam pipe is not closed with the general use of full Kai type safety valve wrench.
3 liquid and water can not be closed for general use compressed medium inching valve, or safety relief valve.
4, the general use of closed high-pressure water safety valve, such as high-pressure feedwater heater, heat exchanger etc..
5, gas general use of closed valve compression of the medium, such as the gas tank, gas pipeline etc..
6, E is commonly used in steam boiler static safety valve.
7, large diameter, large displacement and high pressure systems generally use pulse valve, such as temperature and pressure equipment, boiler etc..
8, train transporting liquefied gas tankers, tank trucks, tanks and other general use built-in safety valve.
9, tank top general hydraulic safety valve, to be used in conjunction with the breathing valve.
10, underground drainage or natural gas pipelines generally use pilot operated safety valve.
Five, Spring micro open type safety valve Installation instructions:
1, the valve must be installed vertically, and best installed directly in the container or pipe joints. The import of the inner diameter of the joint should not be less than the safety valves. 　　
2, the safety valve must be installed the export of appropriate expansion joint, to prevent the discharge pipe thermal expansion safety valve to bring unnecessary heat stress. The discharge pipe diameter than the valve outlet should be of large diameter and length as short as possible, avoid turn. Discharge pipe and expansion joint weight should not be in the safety valve should be fixed on the building.Distance between the center lines of the discharge tube and the valve between the as short as possible. For each set of safety valve should be installed separately discharge tube. 　　
Exit 3, muffler to have enough area, prevent the discharge capacity of the valve back pressure effect.
Six, Spring micro open type safety valve The main components of materials:

Seven, dimensions and connection dimensions:

Eight, notice: if you A42Y-: spring full open closed safety valve interested please consult or order according to the following requirements.
1, the safety valve product name and model of safety valve safety valve with the attachment so that we use for temperature and medium pressure using the safety valve and safety valve of your selection.
2, if has the safety valve type design units selected Zhongwei company, please press the model directly to our sales department order.
3, the occasion is very important when using more complex or the environment when you try to provide design drawings and detailed parameters by our Zhongwei company engineer audit checks for you