CN202188182U

CN202188182U - Air-exhaust safety valve

Info

Publication number: CN202188182U
Application number: CN201120301703XU
Authority: CN
Inventors: 赵春岳; 郑子林
Original assignee: YONGYI-VALVE GROUP Co Ltd
Current assignee: YONGYI-VALVE GROUP Co Ltd
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2012-04-11
Anticipated expiration: 2021-08-17

Abstract

The utility model relates to an air-exhaust safety valve which comprises a main valve and a guide valve. The air-exhaust safety valve is mainly characterized in that a piston cavity is formed by a valve flap of the main valve and a valve cavity and a valve cover at an inlet side of a valve body; a small hole connecting an inlet passage and the piston cavity of the valve body is formed on the valve flap; a through hole connecting the inlet passage and the piston cavity of the valve body is formed on the valve body; a flow regulator is arranged on the through hole; an opening-height regulating thread insert is arranged between the valve cover and the piston cavity; a seal cavity which is communicated with a transverse inlet of the guide valve is arranged between the opening-height regulating thread insert and the valve cover; and an inner hole connecting the piston cavity and the seal cavity is formed in the center of the opening-height regulating thread insert. By adjusting the relative position between the opening-height regulating thread insert and an upper valve rod, the adjustment on the opening height of the valve flap and the flow coefficient of the main valve are realized; and by adjusting a metering needle of the flow regulator, the control on the closing speed and the opening-closing differential pressure of the main valve is realized. The air-exhaust safety valve has the advantages that the opening height, the discharge coefficient, the discharge time and the opening-closing differential pressure can be adjusted, and the opening height can be observed at any time, and the like. The air-exhaust safety valve is applicable to various medium passages and containers.

Description

The air exhausting type safety valve

Technical field

The utility model relates to valve field, particularly about a kind of safety valve.

Background technique

At present, the structure type of safety valve mainly contains spring Direct loaded safety valve, Pilot operated safety valve and Lever and weight loaded safety valve.The spring Direct loaded safety valve is the medium active force that is directly overcome the flap below by acting force of the spring; In the flap sealing, produce certain seal pressure, play the effect of sealing, when suction side pressure is elevated to certain force value; Medium force spring force; Promote the flap rising and discharge, when suction side pressure dropped to certain value, flap was closed under the effect of spring force.Pilot operated safety valve is made up of main valve and pilot valve, and pilot valve is an independent spring Direct loaded safety valve, and when system pressure was elevated to preset Set pressure, pilot valve was opened, the medium in the main valve piston chamber of releasing, thus drive the main valve discharging.Lever and weight loaded safety valve is the principle that adopts lever balance; The gravity that utilizes weight self overcomes the medium active force of flap below through lever, and when pressure medium was elevated to preset Set pressure, the medium active force that makes progress was broken the balance of this lever; Rise thereby promote flap, discharge.

The major defect of said structure is: the direct load safety valve of spring is that the medium power that directly overcomes the flap below by spring force guarantees to seal; When being in system works pressure; Sealing surface place seal pressure is little; Leak easily, opening height is that the Lift of valve, drain time and speed can't Field adjustment by the method restriction of mechanical stop.The O type circle or the sealing of other caulking gums of good airproof performance need be adopted in the main valve piston chamber of Pilot operated safety valve, and temperature tolerance is poor, and the Lift of valve, drain time and speed can't Field adjustment.Lever and weight loaded safety valve can not be regulated control to the flow of suction side when discharging, return seat slowly, and Blowdown of a safety valve is big.

Summary of the invention

The purpose of the utility model is the deficiency that exists to existing technology, provides a kind of and can regulate Lift, emission factor, can observe the value of Lift at any time, can regulate the air exhausting type safety valve of Blowdown of a safety valve through regulating the time that continues discharging.

The utility model is realized through following scheme:

This air exhausting type safety valve comprises main valve, pilot valve, and main valve comprises valve body, flap, valve gap, valve rod, and valve rod is made up of upper valve rod and lower valve rod, and the center on plane on the flap is fixed in the lower end of upper valve rod.Mainly be that flap upper-end surface outward edge has a upwardly extending cylinder, form piston cavity between the valve pocket of this cylinder and valve body suction side, the valve gap, system is communicated with the aperture of valve body inlet passage and piston cavity on the flap; On valve body, be shaped on the through hole that is communicated with its inlet passage and piston cavity, said through hole is provided with flow regulator; High Adjusting bolt Adjusting screw is installed out between valve gap and the piston cavity; This is opened high Adjusting bolt Adjusting screw and is installed in the valve gap center by screw thread; Be provided with the Seal cage that is communicated with the horizontal import of pilot valve opening between high Adjusting bolt Adjusting screw and the valve gap; The center of opening high Adjusting bolt Adjusting screw is shaped on the endoporus that is communicated with piston cavity and Seal cage, and the upper end of upper valve rod is enclosed within out in the guide sleeve of high Adjusting bolt Adjusting screw lower end; The lower valve rod upper end is fixedly mounted on center, flap lower end surface, and the lower end is fixedly connected with the interior spring seat of the spring chamber that is installed in the valve body lower end face, is provided with spring between spring seat and the valve body lower end face.

In above technological scheme, main valve is provided with out high indicator, and this is driven high indicator and is made up of pointer that is fixedly mounted on the lower valve rod lower end surface and the direction board on the fixed installation spring chamber lower end cap.

In above technological scheme; Flow regulator is made up of metering needle, attaching nut, filler, filler gland; The attaching nut is fixedly mounted on the valve body by outside thread; Be communicated with inlet passage on its endoporus and the valve body and be communicated with through hole between the piston cavity, and be shaped on internal thread and be connected with the outside thread of metering needle, filler is installed between attaching nut and the metering needle by the filler gland.

In above technological scheme, pilot valve adopts Lever and weight loaded safety valve, and the pilot valve valve body is shaped on horizontal import, vertical import and exhaust outlet, and laterally import is communicated with Seal cage through discharge pipe, and vertical import is communicated with the main valve inlet pipeline through the pilot valve inlet tube.

The utility model beneficial effect compared with prior art is: the lower end at upper valve rod upper end and lower valve rod is respectively equipped with out high Adjusting bolt Adjusting screw and Kai Gao indicator, on the through hole between valve body inlet passage and the piston cavity, is provided with flow regulator.Open the relative position between high Adjusting bolt Adjusting screw and the upper valve rod through adjustment, realize adjusting flap Lift and main valve flow coefficient; Through regulating the metering needle of flow regulator, the may command medium gets into the speed in the piston cavity, realizes the control to the main valve closing velocity, both the Blowdown of a safety valve of may command main valve.Have and regulate Lift, emission factor, drain time, Blowdown of a safety valve, and can observe advantage such as Lift at any time.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the structure enlarged view of main valve among the utility model Fig. 1.

Fig. 3 is the structure enlarged view of pilot valve among the utility model Fig. 1.

Fig. 4 is the structure enlarged view at I place among the utility model Fig. 2.

Embodiment

Air exhausting type safety valve as shown in Figure 1 comprises main valve 2, pilot valve 4, and main valve 2 comprises valve body 6, flap 11, valve gap 14, valve rod, and valve rod is made up of upper valve rod 12 and lower valve rod 9, and the center on plane on the flap 11 is fixed in the lower end of upper valve rod 12.Flap 11 upper-end surface outward edges have a upwardly extending cylinder, form piston cavity between the valve pocket of this cylinder and valve body 6 suction sides, the valve gap 14, and system is communicated with the aperture of valve body 6 inlet passages and piston cavity on the flap 11.On valve body 6, be shaped on the through hole that is communicated with its inlet passage and piston cavity, on this through hole, be provided with flow regulator 17.High Adjusting bolt Adjusting screw 15 is installed out between valve gap 14 and the piston cavity; This is opened high Adjusting bolt Adjusting screw 15 and is installed in the valve gap center by screw thread; Be provided with the Seal cage 16 that is communicated with pilot valve 4 horizontal imports opening between high Adjusting bolt Adjusting screw 15 and the valve gap 14; The center of opening high Adjusting bolt Adjusting screw 15 is shaped on the endoporus that is communicated with piston cavity and Seal cage 16, and the upper end of upper valve rod 12 is sleeved on out in the guide sleeve of high Adjusting bolt Adjusting screw 15 lower ends, opens high Adjusting bolt Adjusting screw 15 upper ends and connects an adjustable lever; This adjustable lever stretches out the upper-end surface of Seal cage 16, and and the upper-end surface of Seal cage 16 between be tightly connected.Open the relative position between high Adjusting bolt Adjusting screw 15 and the upper valve rod 12 through the adjustable lever adjusting, realize adjusting control flap 11 Lifts and main valve 2 emission factors.Lower valve rod 9 upper ends are fixedly mounted on center, flap 11 lower end surface; The lower end is fixedly connected with the spring chamber that is installed in valve body 6 bottoms 7 interior spring seats; Sealing is installed between spring chamber 7 and the valve body 6, is provided with spring 8 between spring seat and valve body 6 lower end surface, and is as shown in Figure 2.

In the valve pocket of valve body 6 suction sides, establish a piston cavity steel bushing 13, this piston cavity steel bushing 13 cooperates with the outer peripheral cylinder motive sealing in flap 11 upper-end surfaces.

Main valve 2 is provided with out high indicator 10, and this is driven high indicator 10 and is made up of pointer that is fixedly mounted on lower valve rod 9 lower end surfaces and the direction board on fixed installation spring chamber 7 lower end caps, like Fig. 1, shown in Figure 2.

Flow regulator 17 is made up of metering needle 25, attaching nut 26, filler 27, filler gland 28; As shown in Figure 4; Attaching nut 26 is fixedly mounted on the valve body 6 by outside thread; Be communicated with inlet passage on its endoporus and the valve body 6 and be communicated with through hole between the piston cavity, and be shaped on internal thread and be connected with the outside thread of metering needle 25, filler 27 is installed between attaching nut 26 and the metering needle 25 by filler gland 28.Metering needle 25 may command media through regulating flow regulator 17 get into the speed in the piston cavity.When metering needle 25 was outwards regulated, the medium velocity that gets into piston cavity was accelerated, and flap 11 speeds closes, and when metering needle 25 was inwardly regulated, the medium that gets into piston cavity slowed down, and flap 11 slows down and closes.Realize the closing velocity of control main valve 2, both the size of the Blowdown of a safety valve value of may command main valve 2.

Like Fig. 1, shown in Figure 3; Pilot valve 4 adopts Lever and weight loaded safety valve; Pilot valve valve body 18 is shaped on horizontal import, vertical import and exhaust outlet, and laterally import is communicated with the Seal cage 16 of main valve 2 through discharge pipe 3, and vertical import is communicated with main valve 2 inlet pipelines 1 through pilot valve inlet tube 5.Be provided with pilot valve seat 20 and pilot valve flap 21 between pilot valve 4 horizontal imports and vertical import and the exhaust outlet; Pilot valve flap 21 is fixedly connected with an end of pilot valve valve rod 22; The other end of pilot valve valve rod 22 is connected with an end of lever 23, and the other end of lever 23 is installed weight 24.Be provided with push rod 19 in the vertical import of pilot valve 4, push rod 19 moved up under the medium effect when pilot valve flap 21 was opened, and assisted the pressure medium of horizontal import to back down flap 21.

Medium in the inlet pipeline 1 gets into valve body 6 suction sides; Get into main valve 2 piston cavity through aperture on the flap 11 and flow regulator 17 again; Medium in the piston cavity gets into Seal cage 16 and discharge pipe 3 through the endoporus of opening high Adjusting bolt Adjusting screw 15, arrives the horizontal suction side of pilot valve 4.When the pressure medium in the inlet pipeline 1 is elevated to preset Set pressure value; Force value is delivered to pilot valve 4 horizontal suction sides; Medium backs down pilot valve flap 21; Pilot valve 4 is opened, and moves with pilot valve flap 21 on the medium force pushing mandril 19 of pilot valve 4 vertical suction sides simultaneously to contact, and further auxiliary pilot valve 4 is opened.Medium in the piston cavity discharges with the exhaust outlet of discharge pipe 3 from pilot valve 4 through opening high Adjusting bolt Adjusting screw 15, the pressure medium moment reduction in the piston cavity, and the flap 11 of main valve 2 moves up under the promotion of medium power, makes main valve 2 dischargings.

After the flap 11 of main valve 2 rises to certain altitude; The upper valve rod 12 that rises with flap 11 stops up the lower end endoporus of opening high Adjusting bolt Adjusting screw 15; This moment main valve 2 piston cavity in pressure medium also the pressure medium than main valve 2 suction sides is low, the flap 11 small segment distance that also can rise.In the process that whole flap 11 rises, drive lower valve rod 9 and rise together, the pointer of driving high indicator 10 that is installed in lower valve rod 9 lower ends writes down the Lift value of main valve 2 on direction board.

After pressure medium dropped to certain value, pilot valve valve rod 22 moved down under the effect of weight 24 and lever, and pilot valve 4 cuts out.Simultaneously the medium of main valve 2 suction sides continuously gets into main valve 2 piston cavity through flap 11 bottom apertures and flow regulator 17, when the medium active force is greater than the medium thrust of flap 11 belows in piston cavity, and flap 11 returns of main valve 2, main valve 2 is closed.

Claims

1. air exhausting type safety valve; Comprise main valve (2), pilot valve (4); Main valve (2) comprises valve body (6), flap (11), valve gap (14), valve rod, and valve rod is made up of upper valve rod (12) and lower valve rod (9), and the center that flap (11) is gone up the plane is fixed in the lower end of upper valve rod (12); It is characterized in that flap (11) upper-end surface outward edge has a upwardly extending cylinder, valve pocket, the valve gap of this cylinder and valve body (6) suction side form piston cavity between (14), and flap (11) is gone up the aperture that system is communicated with valve body (6) inlet passage and piston cavity; On valve body (6), be shaped on the through hole that is communicated with its inlet passage and piston cavity, on this through hole, be provided with flow regulator (17); High Adjusting bolt Adjusting screw (15) is installed out between valve gap (14) and the piston cavity; This is opened high Adjusting bolt Adjusting screw (15) and is installed in the valve gap center by screw thread; Be provided with between high Adjusting bolt Adjusting screw (15) and the valve gap (14) and the horizontal Seal cage (16) that is communicated with of import of pilot valve (4) opening; The center of opening high Adjusting bolt Adjusting screw (15) is shaped on the endoporus that is communicated with piston cavity and Seal cage (16), and the upper end of upper valve rod (12) is sleeved on out in the guide sleeve of high Adjusting bolt Adjusting screw (15) lower end, and lower valve rod (9) upper end is fixedly mounted on flap (11) center, lower end surface; The lower end is fixedly connected with the interior spring seat of the spring chamber (7) that is installed in valve body (6) bottom, is provided with spring (8) between spring seat and valve body (6) lower end surface.

2. air exhausting type safety valve according to claim 1; It is characterized in that main valve (2) is provided with out high indicator (10), this is driven high indicator (10) and is made up of pointer that is fixedly mounted on lower valve rod (9) lower end surface and the direction board on fixed installation spring chamber (7) lower end cap.

3. air exhausting type safety valve according to claim 1 and 2; It is characterized in that flow regulator (17) is made up of metering needle (25), attaching nut (26), filler (27), filler gland (28); Attaching nut (26) is fixedly mounted on the valve body (6) by outside thread; Being communicated with inlet passage on its endoporus and the valve body (6) is communicated with through hole between the piston cavity; And be shaped on internal thread and be connected with the outside thread of metering needle (25), filler (27) is installed between attaching nut (26) and the metering needle (25) by filler gland (28).

4. air exhausting type safety valve according to claim 1 and 2; It is characterized in that pilot valve (4) adopts Lever and weight loaded safety valve; Pilot valve valve body (18) is shaped on horizontal import, vertical import and exhaust outlet; Laterally import is communicated with the Seal cage (16) of main valve (2) through discharge pipe (3), and vertical import is communicated with main valve (2) inlet pipeline (1) through pilot valve inlet tube (5).

5. air exhausting type safety valve according to claim 3; It is characterized in that pilot valve (4) adopts Lever and weight loaded safety valve; Pilot valve valve body (18) is shaped on horizontal import, vertical import and exhaust outlet; Laterally import is communicated with the Seal cage (16) of main valve (2) through discharge pipe (3), and vertical import is communicated with main valve (2) inlet pipeline (1) through pilot valve inlet tube (5).