RU2353841C2 - Cock - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: cock comprises body with "inlet" and "outlet" nozzles, stem, tube valve. In closed cock, contact butt of tube valve rests on packing insert of support. Butt ends areas of the valve are made equal. The valve has toothed coupling with the stem. The latter is mounted in cock body at right angle to valve axis. This provides reciprocating movement of valve. Support at the centre has press-fitted packing insert. Peripheral part of support has spokes that serve for "outlet" screwing into nozzle. Space between spokes serves for liquid medium flowing.

EFFECT: decrease in control force and reduction of control execution time.

3 dwg

Description

The invention relates to stop valves and can be used for gas and liquid media, in the gas industry, utilities, etc.

Many designs of locking devices are known, for example, an angular stuffing box valve comprising a housing with input and output channels, a valve connected to a spindle screwed into the thread of the housing. A flywheel is attached to the spindle shank. The crane is manually operated by repeatedly rotating the flywheel. (A.F. Gurevich "Calculation and design of pipe fittings", Leningrad, "Engineering", 1964, p. 111, (fig.16b)).

The disadvantages of the known design of the cranes include a large control effort, especially at high pressure of the working medium, and a long execution time of the control operation.

It is also known locking and regulating device according to RU 2243434 C1, 12/27/2004, which contains an outer casing with a movable locking member installed in it in the form of a sealing cylinder. The said cylinder is located in the inner housing with the possibility of axial movement of the drive from the gear rack. The rack is engaged with the pinion shaft. The latter has a drive element. An annular profile insert is installed inside the outer casing. At the outer end of the insert is a ring of sealing material. The sealing cylinder at the locking end has an annular outer protrusion. This protrusion is located with the possibility of abutment in the ring of sealing material and lock the pressure of the working medium when locking.

With all the advantages of this device, it is quite complex structurally.

The closest analogue is a shut-off valve according to RU 2198335 C2, 02.10.2003, which contains a housing, a shutter, a seat with an elastic seal and a worm shutter drive, including a worm and a worm wheel with a running thread on the inner surface. The shutter is made in the form of a sleeve with a running thread on the outer surface. Said thread on the running surface interacts with the running thread of the worm wheel. A pin is installed in the housing. The sleeve is provided with a groove. The latter interacts with the pin.

With all the advantages of this device and the simplicity of design, it has low maintainability, since the saddle is made with the body at the same time.

The problem achieved by the invention is to create such a technical solution, using which the simplicity of the design is maintained, maintainability and reliability are improved while accelerating and facilitating the crane control process.

To achieve the named technical result, the valve includes a body with fittings "input" and "output", a rod connected to a tubular valve, the contact end of which is closed in the closed valve in the sealing insert of the support, the end areas are made equal, the valve has a gear connection with the rod fixed in the crane body perpendicular to the axis of the valve and providing reciprocating movement of the valve, the support in the center has a pressed-in sealing insert, the peripheral part of the support has spokes that screw I am in the “outlet” fitting, the space between the spokes serves for the flow of the working medium.

The crane in the closed state is shown in the drawings. Figure 1 shows a General view, figure 2 is a section aa, figure 3 is a view along arrow B.

The crane includes a housing 1 (figure 1) with a fitting "input". Inside the housing 1 is a tubular valve 2, made in the form of a hollow cylinder with a contact part of one end. On the side surface of valve 2, teeth are cut in the form of a rack. The axis of the valve 2 can be offset from the axis of the housing 1 from design considerations. The rod 3 is made with a gear, the teeth of which mesh with the teeth of the valve 2, and is mounted in the housing 1 perpendicular to the valve 2. A handle is attached to the rod 3 end (FIG. 2). An “outlet” fitting is screwed into the housing 1, in which a support is fixed on the knitting needles 4. O-rings on the valve 2 separate the inlet and outlet cavities, preventing the working medium from escaping outward, eliminating the need for a stuffing box packing 3. In the closed position of the valve, the contact part of the valve end face 2 abuts against the sealing insert pressed into the support 4.

The crane works as follows.

To close the tap, it is necessary to turn the handle of the rod 3 clockwise to the position "Z" - "closed" (figure 3). The valve 2 with its end face, the contact part, abuts against the sealing insert of the support 4. The flow of the working medium will stop. To open the tap, you need to turn the handle in the opposite direction to the position "O" - "open". The valve 2 will move away from the support 4, and the working medium will flow from the inlet inside the valve 2 into the channels between the spokes of the support 4 and the outlet connector and inside the outlet itself.

In the closed position of the valve, the tightness of the contact part of the end face of the valve 2 with the support 4 is provided by the force from the pressure of the working medium on the opposite end of the valve 2 with a platform equal to the area of the contact part of the end face. The selection of the diameter of the pinion gear 3 and the length of the handle, taking into account the stroke H of the valve 2, this force must be overcome by the force applied to the handle when opening the crane. In the open position of the valve, the valve 2 on both sides is balanced by forces from the pressure of the working medium on equal areas of the ends. Therefore, to close the valve, it is necessary to overcome only the friction force of valve 2 and rod 3 against the housing 1. And this operation is performed by turning the handle by a small angle.

The essence of the invention lies in the fact that instead of a needle valve, a tubular made in the form of a hollow cylinder with a smaller area / end face / pressure of the working medium is used; there is no self-braking thread on the rod, which in itself reduces forces; no stuffing box packing; the design of the tubular valve allows you to balance the forces from the pressure of the medium on equal areas of its ends and use the force from the pressure of the working medium to ensure the tightness of the contact part of the valve end with the support; multiple rotation of the handwheel, replaced by a handle, and the stem with a valve, replaced by a stem with gear, is not necessary, due to which it is sufficient to turn the handle by a small angle for crane operation, which reduced the execution time of the control, and the support, screwed into the “outlet” fitting, increases the maintainability of the crane.

Claims (1)

A valve including a housing with “inlet” and “outlet” fittings, a rod connected to a tubular valve, the contact end of which in a closed valve is abutted in the sealing insert of the support, the ends are made equal, the valve has a gear connection with a rod fixed perpendicularly to the valve body the axis of the valve and providing reciprocating movement of the valve, characterized in that the support in the center has a pressed-in sealing insert, the peripheral part of the support has spokes that screw into the “outlet” fitting, GUSTs between the spokes serves for the pressure medium duct.

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