CN201723730U - Self-operated pneumatic manual emergency shut-off valve - Google Patents

Abstract

The utility model relates to a self-operated pneumatic manual emergency shut-off valve, which comprises a valve body, a valve clack, a valve rod, a valve cap and a pneumatic device. The shut-off valve has the main technical scheme that a rodless cavity of a piston cylinder of the pneumatic device is connected with a manual shut-off device; the valve clack is movably mounted between an upper convex shoulder and a lower retaining ring which are arranged at the lower part of the valve rod, the self-closing distance is formed between the lower plane of the valve clack and the lower retaining ring, and the self-closing distance is greater than the height and the distance of the valve clack capable of maximally opening. When the pipeline is needed to emergently shut off under the condition that the pneumatic device of the emergency shut-off valve is in failure, the pipeline can be emergently shut off through the manual shut-off device; furthermore, when the power is in failure suddenly, the pressure of the downstream pipeline surges, and the phenomenon of medium backflow occurs, the valve clack automatically fall to shut off the pipeline under the action of the dead weight and the pressure of the reversed medium, and the safety of the system and the equipment can be reliably protected and the protection reliability of the system and the equipment is high under the condition of any emergency, thereby being applicable to the protection devices on the outlet pipelines of the equipment such as a pumping plant, a steam turbine and the like.

Description

Hand-operated emergency cut-off valve for self-operated pneumatic tape

Technical field

The utility model relates to a kind of valve, particularly about a kind of Emergeny Cutoff Valves of protecting pipeline safety under emergency case.The utility model is applicable to the protective gear on the pipelines such as equipment outlets such as pumping plant, steam turbine and combustion gas, liquefied petroleum gas.

Background technique

The effect of Emergeny Cutoff Valves is when unusual urgency appears in system pipeline, and rapid-closure damper cuts off pipeline, protective system and device security.As the patent No. is the pneumatic repid cut-off valve of ZL200920257243.8, comprises selector valve, cylinder and stop valve, and when unusual urgency appearred in pipeline, the motion by piston in the selector valve control cylinder made the stop valve fast shut-off, protective system and device security.Its shortcoming is: under the stop valve full-gear; if the selector valve control system breaks down or have a power failure suddenly or the downstream loine pressure sharply rises and when medium taking place flowing backwards; can't cut off pipeline, lose protective action, to the poor reliability of system and equipment protection system and equipment.

Summary of the invention

The purpose of this utility model is the shortcoming that exists at prior art; providing a kind of breaks down or has a power failure suddenly or the downstream loine pressure sharply rises and when medium taking place flowing backwards in atmospheric control; can under urgent, abnormal conditions, manually or automatically cut off pipeline, the hand-operated emergency cut-off valve for self-operated pneumatic tape of reliably protecting system and device security.

The technical solution of the utility model comprises valve body, flap, valve rod, valve gap, Pneumatic actuator, is shaped on valve seat between the snout cavity of valve body and the outlet plenum.Under flap and the valve base sealing mated condition, its lower end surface is communicated with the valve body snout cavity, and the upper-end surface is communicated with the valve outlet chamber.Pneumatic actuator is made up of piston and piston cylinder, fixedlys connected with piston in the valve rod upper end, and the middle part is provided with return spring.The rodless cavity that mainly is piston cylinder connects a manual shut-off means, this hand off device is made up of handwheel, support, transmission nut, drive link, connecting sleeve, transmission nut is connected with the drive link screw-thread fit, connecting sleeve is movably arranged in the endoporus of support, the one side is shaped on the axially locating groove, this locating slot cooperatively interacts with the locating stud that is fixed on the support, fixedlys connected with connecting sleeve in the lower end of drive link, and the upper-end surface of its lower end surface and valve rod contacts in connecting sleeve.Flap is movably arranged between made last convex shoulder of stem lower portion and the following back-up ring, be provided with rubber seal between plane and the last convex shoulder on the flap, have between flap lower plane and the following back-up ring and close spacing automatically, this closes the maximum Lift distance of spacing greater than flap automatically.

The utility model beneficial effect compared with prior art is: the hand off device is set on the rodless cavity of Pneumatic actuator piston cylinder; Flap is movably arranged between made last convex shoulder of stem lower portion and the following back-up ring, has between flap lower plane and the following back-up ring and closes spacing automatically.Under the pipeline normal operation, Emergeny Cutoff Valves is in full-gear, and the drive link of hand off device is raised to peak.Under the Emergeny Cutoff Valves normal operation, when needing the emergency cut-off pipeline, can cut off pipeline by Pneumatic actuator; Under the pressure system of Emergeny Cutoff Valves Pneumatic actuator breaks down situation, when needing the emergency cut-off pipeline, can be by hand off device emergency cut-off pipeline; When the pressure of unexpected power failure, downstream line sharply rises, during medium generation refluence phenomenon, the flap cut-out pipeline that under deadweight and the effect of reverse media pressure, falls automatically.So when under any circumstance accident taking place, the utility model can both fast shut-off pipeline, the safety of protective system and equipment reliably.

Description of drawings

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

Embodiment

Hand-operated emergency cut-off valve for self-operated pneumatic tape as shown in Figure 1, comprise valve body 1, flap 7, valve rod 3, valve gap 9, Pneumatic actuator, be shaped on valve seat between the snout cavity of valve body 1 and the outlet plenum, be respectively equipped with sealing gasket 19 and O-ring seals 8 between valve gap 9 and valve body 1 and the valve rod 3.Under flap 7 and the valve base sealing mated condition, its lower end surface is communicated with the snout cavity of valve body 1, and the upper-end surface is communicated with valve body 1 outlet plenum.Pneumatic actuator is made up of piston 12 and piston cylinder 11, is provided with seal ring 18 between piston 12 and the piston cylinder 11, and fixedlying connected with piston 12 in valve rod 3 upper ends, is provided with Sealing between the two, and the middle part is provided with return spring 10.Piston 12 constitutes rod chamber and rodless cavity in piston cylinder 11, be shaped on the source of the gas inlet/outlet in its rod chamber.The rodless cavity of piston cylinder 11 connects a manual shut-off means, this hand off device is made up of handwheel 17, support 21, transmission nut 14, drive link 20, connecting sleeve 22, transmission nut 14 is connected with drive link 20 screw-thread fit, in support 21, handwheel 17 is fixedly mounted on the transmission nut 14 by locking nut 16 by gland nut 15 and Bearing Installation.Connecting sleeve 22 is movably arranged in the endoporus of support 21, and the one side is shaped on the axially locating groove, and this locating slot cooperatively interacts with the locating stud 13 that is fixed on the support 21, and connecting sleeve 22 can be moved axially in support 21, limits it and radially rotates.Fixedly connected with connecting sleeve 22 in the lower end of drive link 20, its Placement adopts axial flat key to interconnect.The upper-end surface of the lower end surface of drive link 20 and valve rod 3 contacts in connecting sleeve 22, when Pneumatic actuator breaks down and under the cisco unity malfunction situation, by rotating handwheel 17, drives drive link 20 and moves down, and promotes valve rod 3, flap 7 Emergeny Cutoff Valves cuts out.Flap 7 is movably arranged between made last convex shoulder in valve rod 3 bottoms and the following back-up ring 23, and this time back-up ring 23 is fixedly mounted on the following convex shoulder of valve rod 3 by nut 2.Be provided with rubber seal between the convex shoulder on plane and the valve rod 3 on the flap 7, realize the seal request under flap 7 closed conditions.Have between flap 7 lower planes and the following back-up ring 23 and close spacing H automatically, this closes the maximum Lift distance of spacing H greater than flap 7 automatically, guarantee that flap 7 has enough moving axially to close distance, guarantee when downstream pipeline pressure medium occurring and sharply rise, pressure medium promotes flap 7 and closes automatically, makes to reach the reliable sealing state between flap 7 and the valve seat.Preferably close the maximum Lift distance big 2mm of spacing H automatically than flap 7.

In above embodiment, flap 7 lower planes are provided with the sealing seat 6 that cooperatively interacts with valve seat, and sealing seat 6 is fixedly mounted on the flap 7 by screw 4 by pressing plate 5, and the distance under pressing plate 5 lower planes arrive between the back-up ring 23 is greater than the maximum Lift distance of flap 7.

Claims (2)

1. hand-operated emergency cut-off valve for self-operated pneumatic tape, comprise valve body (1), flap (7), valve rod (3), valve gap (9), Pneumatic actuator, be shaped on valve seat between the snout cavity of valve body (1) and the outlet plenum, under flap (7) and the valve base sealing mated condition, its lower end surface is communicated with valve body (1) snout cavity, the upper-end surface is communicated with valve body (1) outlet plenum, Pneumatic actuator is made up of piston (12) and piston cylinder (11), fixedly connected with piston (12) in valve rod (3) upper end, the middle part is provided with return spring (10); The rodless cavity that it is characterized in that piston cylinder (11) connects a manual shut-off means, this hand off device is by handwheel (17), support (21), transmission nut (14), drive link (20), connecting sleeve (22) is formed, transmission nut (14) is connected with drive link (20) screw-thread fit, connecting sleeve (22) is movably arranged in the endoporus of support (21), the one side is shaped on the axially locating groove, this locating slot cooperatively interacts with the locating stud (13) that is fixed on the support (21), fixedly connected with connecting sleeve (22) in the lower end of drive link (20), the upper-end surface of its lower end surface and valve rod (3) contacts in connecting sleeve (22); Flap (7) is movably arranged between valve rod (3) the bottom made last convex shoulder and following back-up ring (23), flap (7) is gone up between plane and the last convex shoulder and is provided with rubber seal, have between flap (7) lower plane and the following back-up ring (23) and close spacing (H) automatically, this closes the maximum Lift distance of spacing (H) greater than flap (7) automatically.

2. hand-operated emergency cut-off valve for self-operated pneumatic tape according to claim 1 is characterized in that closing automatically the maximum Lift distance big 2mm of spacing (H) than flap (7).