SU879119A1 - Gate - Google Patents

Description

(54)

SLIDING VALVE

The invention is intended to shut off the flow of fluid in pipelines in the underground mining of coal by hydraulic, lyrical method and can be used in the water supply, chemical and oil producing industry.

A known gate valve with a hydraulic actuator of the locking member, holding the body, a welded structure with low weight, unloaded - a drive control of the locking member, and the form of execution of the slide valve itself ensures the cavitation of the working valve that occurs in the process of opening / closing / of the valve beyond the limit of the locking member.

The purpose of the invention is to increase the reliability of the valve.

This is achieved by the fact that a window is made in the proposed gate valve with an anti-cavitation valve and a hydraulic valve inside the welded body in the upper part of the longitudinal pipe, a conical bevel in the form of a jet and an isostum is made at the lower end of the longitudinal tube; 1dn1: 1m spindle pitcher

which is provided by the working flow | through the control valve.

Such an embodiment of the housing allows it to be made of pipes with a diameter equal to the diameter of the main pipeline, thereby reducing its mass to a minimum, replacing the sealing seats, without removing the valve body from the pipeline, securing the elastic sealing ring between the housing and the seat. Such a gate configuration will allow cavitation to be carried out beyond the closure body, exclude the ejector effect of the streamlined jet gate on the elastic sealing ring and equalize pressure as much as possible to its parameter, as well as keep the sealing ring from moving. The use of a combined drive allows the op. To open and close: detent by using the energy of the flow and rotating the handwheel with minimal gain.

FIG. 1 schematically shows a gate valve; in fig. 2 is a section A-A in FIG. one.

The valve consists of a housing 1, two floating seats 2 with elastic sealing rings 3, a gate 4, an actuator 5 consisting of a hydraulic jack with a hollow piston 6 and a rod 7, a nut 8, a non-fixed spindle 9, a control valve 10, and a pipe 11 for supply to the jack working fluid from the pressure part of the working pipeline

The welded body of the slide, made in the form of a tee of pipes with a diameter equal to the diameter of the pipeline, has connecting flanges 12 for installing it into the pipeline and fastening the upper rim 13. In the housing flow pipe there are restrictive protrusions 14, made one for it to fix the floating saddles and groove 15 for installing saddles I; Limit the movement of the gate 7.. .

A window 16 is made in the upper part of the passage pipe to remove and install sealing seats without dismantling the valve body from the pipeline and to accommodate a gate. To provide a predetermined direction of movement of the gate in the upper body pipe, guides 17 are installed. The gate is made flat with a conoidal bevel 18 whose depth is half the width of the floating seat in the lower part to carry out cavitation and equalize the pressure around the perimeter of the elastic ring with a lug 19 long holding the inlet seat against movement when the gate is open, with a T-shaped socket for connection with the jack shaft.

The discharge jack is secured in a double-sided housing.

In the upper part of the jack-mounted bearing unit, Dixing non-sliding spindle 9 with the steering wheel 20. To control the jack working fluid on the body installed control valve 10 with pipelines. When opening or closing the valve switches the control valve to the appropriate position

Gu working fluid through an undersea pipeline enters the jack / at from; the roof - a piston, and when closed on the piston / and creates a force equal to the resistance to movement of the gate. When the handwheel and spindle are rotated, the nut with the piston, rod, and gate moves along the spindle. At a descent into: the sealing surface of the saddle, a slit is formed and a jet appears, having a minimum cross section at the end of the valve body. its account is formed either between the conoidal bevel and the floating inlet and outlet saddles and the minimum; maximum intravoltage pressure leading to the formation of tear-away cavities and cavitation behind the locking organ. As the gap increases and the difference decreases, the pressure in the valve body behind the valve is proportionally changed before and behind the valve. When closing, the opposite is true. At. when reaching the gate of the saddle boundary, the cross section overlaps and the metal is compacted to metal, and when the gate of the elastic ring is reached, its deformation takes place due to the pressing force from the working pressure on the gate, thereby sealing the closure member.

Claims (1)

Invention Formula A damper valve, in the case of which there is a gate connected to the drive, and a floating seat, characterized in that in order to increase the reliability of the device, the gate is provided with a projection, and on the inlet side of the working medium it has a bevel that is half the width of the saddle with a gradual decrease in its height to zero to the central part. Sources of information taken in attention during examination 1. German patent number 76855, cl. 47 26/02, publ. 1894.