the relief valve working principle of the relief valve disc or a heavy hammer compaction force of spring above the load via a lever on the disc, the pressure and the medium normal pressure balance on the disc, disc and seat sealing surface and at this moment, when the medium pressure exceeds rating, the spring is compressed or heavy hammer is jacking, disc out of balance, leave the seat, medium is expelled; When the medium pressure drops below ratings, spring or a heavy hammer compaction force through lever load on the disc pressure is greater than the effect of medium force on the disc, the disc back seat, sealing surface closed again. For the motion of the relief valve below

1) higher sensitivity: when the medium pressure in the pipeline or equipment to open, the relief valve should be able to timely open; When the medium pressure returned to normal, the relief valve should be closed in time.

(2) should have the prescribed discharge capacity: under the rated discharge pressure, open the relief valve should meet the height, at the same time achieve the rated capacity.

the structure of the safety valve relief valve can be divided into four categories according to the structure of the form

1) and weight safety valve: it is load with heavy hammer, directly put on the disc. This kind of structure shortcoming many, now rarely used.

(2) the lever and weight safety valve: heavy hammer loading on the disc via a lever, load does not change with open height, but are sensitive to vibration, and the quality of the back seat. It is composed of valve body, valve cover, stem, guide fork ( Limit lever up and down movement) , the lever and weight ( To adjust the action of pressure on the disc) , prismatic bearing and force ( Improved action sensitive role) , top ( The valve stem position of role) And throttling ring ( The same effect as disc holder) , the screw and screw ( ACTS as a heavy hammer position) And other parts. Often used in low pressure systems.

3. Spring safety valve: - as shown in figure 2 67, by forces acting on the disc spring to control valve valve opening and closing. It has compact structure, small volume, light weight, reliable opening and closing action, is not sensitive to vibration, etc; Its shortcomings are load acting on disc changes according to the opening. Are very strict on the performance of the spring, makes them. It consists of the following main parts.

。 Body and bonnet. Body show 90 & import channels with outfalls deg; Angle, similar to Angle type globe valve. Spring safety valve is closed and not closed two kinds. Enclosed the relief valve outlet channel into the discharge pipe, the container or equipment in the medium to discharge to the reservation.

not enclosed relief valve does not discharge pipeline, the medium directly discharge into the surrounding atmosphere, suitable for pollution-free medium. Bonnet for tubular, built-in stem, spring and other parts, with flange bolt connection on the valve body.

b。 Disc and seat. According to the opening of the disc, safety valve can be divided into tiny qi type and full enlightenment. - raise safety valve, as shown in figure 2 68 is mainly used for the liquid medium occasions disc opens the height only 1/40 ~ 1/20 for valve seat throat diameter, and the valve seat valve structure similar to stop valve, resettlement adjustment in the seat ring. All safety valve, as shown in figure 2 - 67, is mainly used for gas or steam. Open the disc height is equal to or greater than a quarter of the valve seat throat diameter. Placed on the seat adjustment ring, put on the disc disc holder.

C。 Spring and spring seat up and down. Spring is fixed between the spring seat up and down. Spring force through the spring seat and valve stem on the disc, the spring seat by adjusting bolt positioning, budge adjusting bolt can adjust the spring force, to control the opening pressure of the relief valve.

d。 Adjust the circle. It is for adjusting the opening and closing the differential parts.

e。 Disc holder. With disc together, it plays to the flow direction of medium change, increase the effect of opening, for the rev on the safety valve.

in addition, from the external structure, but also can be divided into the with and without spanner wrench, with and without corrugated pipe, corrugated pipe with and without fin heat sinks, etc. A bellows valve suitable for corrosive medium or back pressure volatile situations; A wrench safety valve in case of an emergency, by manual operation pressure; A heat sink of the relief valve is suitable for the occasion of medium temperature greater than 300 c.

(4) pilot operated relief valve, as shown in figure 2 69, which is composed of the main valve and vice valve, the lower part is called the main valve, called vice valve on the upper, borrow the role of vice valve to drive the main valve action of safety valve, when the medium pressure exceeds rating, vice valve spring is compressed, to rise, the valve flap of the deputy vice valve to open. So medium into the top of the piston cylinder. Because the area of the piston cylinder is greater than the main valve disc area, pressure forces the pistons to move down, drive the main Industrial Valves disc moves down open, medium to discharging. When the medium pressure drop to below the rating, the deputy valve spring vice valve closed, under the action of the main valve piston no medium effect, the piston in the spring under the action of the springback, coupled with medium pressure to close the main valve. Pilot operated relief valve is mainly used for large diameter high pressure situations.

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