Piston valve

FIELD: machine building.

SUBSTANCE: piston valve comprises the housing with sealing bushing, two gate pistons, two rods, two covers, two support concave platforms. The housing is made as a cross with two thread holes with plugs. At centre of the housing the sealing bushing with ends is placed, from two sides of which gate pistons are inserted, that are made with cavities, with bottoms and end seals. Bottoms are hermetically connected with rods, for which openings through seals in covers are provisioned, at the rod ends the support concave platforms are installed. The internal surface of the housing, sealing bushing ends, cavities of gate pistons and cover form two vessels filled with hydraulic oil.

EFFECT: reliability of valve operation in emergencies and acts of nature, possibility for preventive repair without dismantling from the pipeline.

5 dwg

 

The invention relates to valves and can be used in petroleum, chemical and other industries.

Known piston valve for polluted environments. It includes a housing with a guide camera, communicated through the check valve with a source of cleansing the environment, and a cylindrical lock body mounted with its outer surface seals unilateral action. And inside the locking body is formed of a sealed cavity, in which is mounted a piston with a through hole, and the valve is provided with a hollow piston rod rigidly connecting the piston with the housing, through which podpornega cavity communicated with a source of cleansing the environment, and in the hole of the piston, a check valve, and in the upper zone newportnews cavity in the locking body channels blocked by seals single acting (A.S. SU 1151747, CL F16K 3/28, 1985).

The disadvantage of this valve are the inability to shut off the flow of the labor force during emergency situations in the automatic mode, the lack of reliability due to design complexity, manifested in the presence of a relatively large number of sealing elements.

Closest to the claimed technical solution is a hydraulic piston valve with the holding piston-gate, having grooves interconnected filled with hydraulic oil and creating a labyrinth seal between the piston-damper and sleeve. And the positioner piston-gate simultaneously performs the functions of the stroke limiter piston-gate and prevents rotation of the latter, and in the battery of the mechanical energy of the spring have a different direction of winding and the Assembly are interleaved with each other and between the springs and the piston is heel, with lower convex spherical surface and the upper surface of the piston-gate has the form of an inner cone, and the heel contains a hole for a pointer, and it can be mounted in the lower part of the connecting grooves sliders fill all of the grooves hydropathy, and it can be mounted in the gap between the fifth and the piston-gate additional elastic sealing (A.S. EN 2126921 C1, F16K 3/24, 1999).

The disadvantage of this valve is the need for continuous operation of the compressor to ensure the retention of the piston-gate in the up position to ensure the passage of the working medium through the valve. Run the battery to mechanical energy with several springs in the upper part of the body acting on the piston-gate, when a disaster occurs at the compressor installation or on-line control valve leads the children to undesirable overlapping of the working medium through the valve by the action of springs, installed in the upper part of the body. In this situation there is no possibility for fast opening of the valve for passage of the working environment.

The challenge which seeks the invention is to increase the reliability of the valve during disasters and emergency situations.

This problem is solved due to the fact that the piston valve includes a housing with a sealing sleeve, two piston-gate, two rods, two caps, two supporting concave pad, characterized in that the casing is made in the form of a cross with two screw holes, plugged tubes, grommet placed in the center of the housing, with the two sides entered pistons-gates, made with cavities, with the bottom and end seals, bottom sealed with stems outputs through a hermetic seal caps on the ends of rods placed supporting concave pad, the inner surface of the housing, the ends of the sealing bushing cavities of the piston-slides and the cover is formed of two tanks filled with hydraulic oil.

The technical result is achieved by the fact that accommodation in the valve housing two piston-damper allows for maintenance without removal from the pipeline. The result is the reliability of the valves during emergency situations and natural be the settings.

The invention is illustrated by drawings, which depict: figure 1 - General view of the piston valve; 2 - piston valve in the working position; figure 3 is a piston valve in closed position; figure 4 - piston valve in closed position; figure 5 is a piston valve in a state of repair.

The proposed construction of the piston valve consists of a housing 1, made in the form of a cross with two screw holes 2, plugged tubes 3. In the center of the housing 1 is placed sealing sleeve 4 with the ends 5, with the two sides of the sealing sleeve 4 introduced two piston-gate 6, made with bottoms 7, the end seals 8, made in the form of annular grooves and cavities 9. Two rod 10 is hermetically sealed with end plates 7 with access through a hermetic seal 11 in the cover 12 with the slots 13 and 14 stops. At the ends of the rods are supporting concave areas 15 between the housing 1 and the cover 12 posted by o-ring seals 16, fastened by bolts 17. The inner surface of the housing 1, the end faces 5 of the sealing sleeve 4, the cavities 9 and the cover 12 is formed with two reservoirs filled with hydraulic oil (figure 1).

The valve works in the following way. Before installing the valve on the pipeline pistons-gates diluted to the lugs 14 of the cover 12, Unscrew the tube 3 and fill the hydraulic oil, which is across the slot 13 fills the tank, educated internal surface of the housing 1, the end surfaces of the sealing sleeve 4, the cavity 9 and the cover 12, choke tubes 3. The oil in the tank is in a static state, it is provided by the density of the contact piston-damper 6 with the sealing sleeve 4, the hermetic seals of the rods 10 and passing through the valve environment. During normal operation, the opening and closing of the valve is performed manually by the effect on the concave area (figure 2).

Upon the occurrence of a natural disaster, such as fire, oil well temperature around the valve increases, which leads to heating of the tanks with oil, which boils, there is a growing pressure that acts on the bottom of the piston-slides and leads them to a counter-movement to the clamping ring seals, blocking passing through the valve environment (figure 3).

The presence of the supporting concave pads 15 on the ends of the rods 10 connected with the bottoms 7, the piston-slides 6, provides remote overlapping passing through the valve of the environment by the action of the water jet from a fire hose on the supporting concave space 15. Jets while changing the movement on the back and on the concave surface creates a region of high pressure, which causes the piston-gate 6 in the movement of the ring seal opposite the piston-gate 6,reliably blocking passing through the valve environment (figure 4).

For the maintenance of the right piston-gate overlap passing through the valve Wednesday, the left piston-gate is in a degraded state that allows you to deploy bolts, drain the oil, remove the piston-sliding and perform preventive maintenance.

After repair install piston-gate back in place and block them from passing through the valve Wednesday, while the right piston-gate is moved under the action of the left piston-gate to the stop 14 of the cover 12 and is outside the position that provides the opportunity for the bolts and perform preventive maintenance of the right of the piston-gate (figure 5).

Piston valve, comprising a housing with a sealing sleeve, two piston-gate, two rods, two caps, two supporting concave pad, wherein the body is made in the form of a cross with two screw holes, plugged tubes, grommet placed in the center of the housing, with the two sides entered pistons-gates, made with cavities, with the bottom and end seals, bottom sealed with stems outputs through a hermetic seal caps on the ends of rods placed supporting concave pad, the inner surface of the housing, the ends of the sealing sleeve, the cavity of the piston-slides and caps formed of two tanks filled guide is aliceson oil.



 

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