RU2584044C1 - Valve - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to valve industry, namely to valves with pneumatic control, and is intended for start-up and shut-off of working medium in wide range of pressures, including under conditions of low temperatures. Valve comprises body with inlet, outlet branch pipes and seat, large gate with seat, inner bore and face seal, small gate with end face seal, casing bottom, spring and drive. In housing in output cavity stepped groove is made. On drive side housing has groove and seat. Body bottom is made in form of cover with central sleeve with internal blind groove. Sleeve with stop are installed in groove of large gate. Small gate is made with internal blind groove, shoulder and stem. In body there is piston with stepped stem with groove and face seal in contact with seat body and interacting with outer diameter of piston with inner diameter of body groove, larger diameter stem with inner diameter of stepped grooves of body and end face of stem smaller diameter with end of small gate internal blind groove. At that, collar of small gate contacts with sleeve stop. Small gate stem interacts with internal surface of blind grooves of cover central sleeve.

EFFECT: use of said unit ensures multiple actuation of valve at high working pressures at inlet, including under low temperatures, and simplifying design in comparison to prototype.

3 cl, 1 dwg

Description

The invention relates to valve manufacturing, namely to valves with pneumatic control, and is intended for starting and cutting off the working fluid in a wide range of pressures, including at low temperatures. The invention can be used in mechanical engineering, for example, in power plants located on aircraft, for example on airplanes, in rocket technology, in propulsion systems.

A known electromagnetic valve (patent RU 2302576 C2, IPC F16K 31/42, F16K 31/02), comprising a housing, a main valve, a pilot valve, a guide, springs and an electromagnetic actuator.

The disadvantages of this valve are the increased value of hydraulic resistance at high values of the flow of the working fluid, the lack of efficiency of the valve at low temperatures and the complexity of the design of the unit.

Known shut-off and shut-off valve (patent RU 2386880 C1, IPC F16K 3/24, F16K 39/02, F16K 47/02), comprising a housing with inlet and outlet channels, a shutter made in the form of a rod with a piston, with a sealing surface and holes, a locking and regulating shutter made in the form of a stepped bushing-plunger with a sealing surface, and a saddle mounted in the housing.

The disadvantages of this valve are the design complexity, increased hydroresistance and inoperability of the unit at low temperatures.

A known electromagnetic valve (application JP 1-224580, IPC F16K 31/06) containing a housing, an electromagnet coil, a stator core, a plunger, a large shutter.

The disadvantages of the electromagnetic valve include the complexity of manufacturing, increased hydroresistance and insufficient operability of the unit at low temperatures due to the location of the electromagnetic drive near the flow cavity of the unit.

Known gate valves with wedge-shaped locking elements (patent US 4678008, IPC F16K 3/12), comprising a housing, a gate valve in the form of a wedge-shaped locking element with a through channel, a stem and a valve located in the through channel of the gate valve.

The disadvantages of the unit include the impossibility of operation at high pressures, as well as the difficulty of ensuring high tightness at the place of sealing of the locking element on the conical surface of the housing under conditions of repeated tripping at high pressures.

Known periodic control valve for steam turbines (patent US 4679769, IPC F16K 1/32), comprising a housing with a seat, a cover, a hardened sleeve, a rod and a locking element with a Central hole.

The disadvantages of the valve include the complexity of the manufacture of the unit and the inability to ensure high tightness at the place of sealing of the shut-off element in the housing under conditions of repeated operations.

Closest to the invention in technical essence is an electro-pneumatic valve (patent RU 2267685 C2, IPC F16K 31/02 - prototype), comprising a housing with an inlet, outlet cavity and a seat made in the inlet cavity, a main shutter with an internal groove and with an mechanical seal, pilot valve with mechanical seal, housing bottom, springs and actuator.

The disadvantages of the electropneumatic valve, adopted as a prototype, is the insufficient operability of the unit at low temperatures, as well as the complexity of manufacturing.

The task of the invention is to provide multiple valve actuation at high operating pressures at the inlet, including at low temperatures, and simplifying the design.

The problem is solved as follows.

In the known device comprising a housing with inlet and outlet nozzles and a saddle, a large valve with a saddle, an internal groove and an mechanical seal, a small valve with an mechanical seal, the bottom of the housing, springs and an actuator according to the invention, a stepped groove is made in the housing in the output cavity, with the drive side in the housing has a groove and a saddle, the bottom of the housing is made in the form of a cover with a central sleeve with an internal blind groove, a sleeve with a stop is installed in the groove of the large shutter, the small shutter is made with an internal With a groove, a collar and a rod, a piston with a stepped rod with a groove and an end seal in contact with the housing seat and an interacting outer diameter of the piston with the inner diameter of the groove of the housing, a large diameter of the stem with the inner diameter of the stepped groove of the housing and an end face of a smaller stem diameter with the end of the inner blind groove of the small shutter, while the shoulder of the small shutter is in contact with the stop of the sleeve, and the stem of the small shutter interacts with the inner surface of the blind groove of the chain neutral sleeve cover.

A seal is installed in the groove of the piston in the form of a cuff of a L-shaped section, at the end of which there is a sealing protrusion interacting with the inner surface of the groove of the housing and the end of the piston.

In the groove made in the outlet cavity of the housing, a seal is installed in the form of a cuff of a L-shaped section, at the end of which there is a sealing protrusion interacting with the large diameter of the piston rod and the end of the groove of the housing.

The proposed valve is presented in figure 1,

where: 1 - housing;

2, 7 - cover;

3 - large shutter;

4 - sleeve;

5 - small shutter;

6 - piston with a rod;

8, 9 - seal;

10, 11 - clip;

12, 13 - slotted spring;

14 - screw;

15 - support;

16 - a nut;

17, 18 - spring;

A, B, C - saddle;

G - stepped groove in the output cavity of the housing;

D - groove in the housing on the drive side;

Ε - the central sleeve of the cover;

F - emphasis;

K - collar;

L - stock of a small shutter;

M - groove in the piston.

The valve contains a housing 1 with inlet and outlet nozzles, a seat A, a stepped groove in the outlet cavity G, a groove on the drive side D and a seat B, a cover 2 with a central bushing Ε and an internal blind groove is installed in case 1, a large shutter is installed in case 1 with a saddle 3, a large shutter 3 is made with a gray B and an internal groove, in which a sleeve 4 with a stop Ж and a small shutter 5 with a blind groove, a shoulder K and a rod L are installed, a piston 6 with a stepped rod, a groove M and mechanical seal in contact with the seat m B, interacting with the end face of a smaller stem diameter with the end face of the blind shutter blind groove 5, while the shoulder of the small shutter K is in contact with the stop of the sleeve Ж, and the stem of the small shutter interacts with the inner surface of the blind groove of the central sleeve of the cover 2, and the grooves M and G are installed seals for sealing the cavity on the valve drive side and the valve outlet cavity, respectively.

The valve operates as follows. When supplying the control gas to the fitting "P _upr ", the piston with the rod 6 moves together with the small shutter 5 until the collar K is mounted on the stop W of the sleeve 4, overcoming the force from the differential mixture and the force of the spring 18, partially opening the valve cross-section. The working mixture enters from the inlet cavity of the valve to the outlet, while the pressure drop of the working mixture on the large shutter 3 decreases and the large shutter 3 starts to move, overcoming the force from the reduced pressure difference of the working mixture on the large shutter 3 and the force of the springs 17, 18, to the piston stop with stock pos. 6 into seat B of housing 1, opening the valve completely. The pressure drop across the large shutter 3 can also be facilitated by the presence of units that increase the resistance of the line behind the valve, for example, the installation of a throttle tuned to the desired resistance to ensure the necessary flow rate of the working mixture at high input pressures of the working mixture. When the control gas is discharged from the fitting “P _control ”, a large valve 3, a small valve 5 and a piston with a rod 6 under the action of the differential pressure of the working mixture on the valves 3 and 5 and the forces of the springs 17 and 18 are moved to their original position on the seats A and B, this closes the valve.

Since the use of the valve is planned in power plants located on aircraft, such as airplanes or rocketry, its parts are made of materials: steel 07X16H6 for housing 1; covers 2, 7; large shutter 3; bushings 4; small shutter 5; piston with rod 6; clips 10, 11; slotted springs 12, 13; screw 14; supports 15; nuts 16; ftoroplast - 4 for seals 8, 9; steel 12X18H10T for springs 17, 18.

Thus, the use of this valve allows for multiple valve actuation at high inlet operating pressures, including at low temperatures, and simplifies the design.

Claims (3)

1. A valve comprising a housing with inlet and outlet nozzles and a seat, a large valve with a seat, an internal groove and an mechanical seal, a small valve with an mechanical seal, the bottom of the housing, springs and an actuator, characterized in that a stepped groove is made in the housing in the output cavity , on the drive side, a groove and a saddle are made in the housing, the bottom of the housing is made in the form of a cover with a central sleeve with an internal blind groove, a sleeve with a stop is installed in the groove of the large shutter, a small shutter is made with an internal blind groove, urt and rod, a piston with a stepped rod with a groove and an end seal installed in contact with the seat of the housing and interacting with the outer diameter of the piston with the inner diameter of the groove of the housing, a large diameter of the rod with the inner diameter of the stepped groove of the housing and an end face with a smaller diameter of the stem with the end face of the inner blind grooves of the small shutter, while the shoulder of the small shutter is in contact with the emphasis of the sleeve, and the stem of the small shutter interacts with the inner surface of the blind groove of the central sleeve Ki covers. 2. The valve according to claim 1, characterized in that a seal in the form of an L-shaped cuff is installed in the piston groove, at the end of which there is a sealing protrusion interacting with the inner surface of the groove of the housing and the piston end. 3. The valve according to claim 1, characterized in that the groove made in the outlet cavity of the housing has a seal in the form of a cuff of a L-shaped section, at the end of which there is a sealing protrusion interacting with a large diameter of the piston rod and the end of the housing groove.

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