RU2333409C1 - Sliding shutter - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: invention relates to stop valves production, particularly to pipeline stop valves to be used in petroleum, gas and chemical industries. The sliding shutter incorporates a casing and seats spring-loaded on both sides, the seats being furnished with a forced pull-back appliance. The shutter recesses house rotary blocks enclosed by cheek recesses with shutter closed. The said cheeks are arranged on the seat necks.

EFFECT: higher cyclic durability of the shutter.

3 cl, 4 dwg

Description

The invention relates to valve engineering, in particular to valves, and can be used in the oil, gas and chemical industries.

Known short-gate valve ZSH 65-210 (see prospectus of JSC “Trading House Botkinsky Zavod”), comprising a housing with spring-mounted saddles installed in it, interacting from both sides with a flat gate controlled by a rod via a helical gear.

The disadvantages of the known design include the constant contact of the sealing fields of the seats with the response fields of the gate, which reduces the cyclic resistance of the shutter due to increased wear of the sealing fields of both the seats and the gate.

Also known is a slide gate valve (see AS No. 517733 F16K 3/10, prototype), free from these drawbacks, comprising a housing, floating saddles installed in it, controlled by a frame rigidly mounted on the gate, the inclined longitudinal sides of which interact with grooves saddles its middle part, jamming in them in the extreme positions of the gate.

The disadvantages of this valve include the need to perform with high kinematic accuracy the interacting elements of the parts: the grooves of the seats, the length and width of the inclined longitudinal sides of the frame, as well as the accuracy of the frame on the gate.

The aim of the invention is to increase the cyclic durability of the valve shutter.

This goal is achieved by the fact that in the niches of the gate are placed with the possibility of rotation of crackers, covered with a closed valve recesses of the cheeks mounted on the necks of the saddles; the recesses are located on the flanges of the cheeks, and crackers are located on the lateral surfaces perpendicular to the sealing surfaces of the gate; crackers are made in the form of a body of revolution, such as rollers.

Figure 1 shows a cross section of a valve; figure 2 is a section along aa in figure 1; figure 3 is a section along BB in figure 1; in Fig 4 is an option.

The gate valve comprises a housing 1, in the passage section of which there are seats 2 pressed against the gate 3, controlled by the stem 4, with disk springs 5. Two or four crackers 7 are placed in the recesses of the nozzle 3, interacting with the “opening-closing” "Valves with cheeks 8 mounted on the neck 9 of the seats 2, and having depressions 10 for crackers 7, and the number of depressions 10 is equal to the number of crackers 7.

The valve operates as follows.

Opening the valve - under the action of the rod 4, the gate 3 starts moving upwards and the crackers 7 located in the recesses 10 of the cheeks 8 also start moving upwards, interacting with the latter, and remove the cheeks 8 mounted on the neck 9 of the seats 2 from the gate 3 by the amount of protrusion crackers 7 above the sealing surfaces of the gate 3, compressing the springs 7. With an additional raising of the gate, the crackers 7 interact with the surfaces of the cheeks 8 until the valve opens completely, while maintaining a gap between the seats 2 and the gate 3.

Closing the gate - when sliding the gate 3 down, the crackers 7 move along the surface of the cheeks 8, (and the embodiment along the edges of the cheeks 8) until the crackers 7 are compatible with the depressions of the 10 cheeks 8. But since the depth of the depressions 10 is greater than the protrusion of the crackers 7 from the gate 3 (in the variant, the depth of the depressions is greater than the value of the removal of the cheeks 8 from the gate 3), the spring 5 tightly presses the saddles 2 to the fitting 3. The valve is closed.

Thus, due to the fact that the cheeks are connected to the saddles with the possibility of controlling the latter, and the protrusion of the crackers from the gate is less than the recesses in the cheeks, the saddles are reliably removed when the valve opens and the saddles are clamped when closed. Such actions exclude the friction of the sealing fields of the seats and the gate, which eliminates their wear, and therefore increases the cyclic stability of the shutter.

Claims (3)

1. Gate valve, comprising a housing, spring-loaded on both sides of the gate valve with forced retraction, characterized in that in the niches of the gate are placed with the possibility of rotation of rusks, covered with a closed gate by the recesses of the cheeks mounted on the necks of the seats. 2. The slide gate valve according to claim 1, characterized in that the recesses are located on the flanges of the cheeks, and crackers are located on the lateral surfaces perpendicular to the sealing surfaces of the gate. 3. Gate valve according to claim 1, characterized in that the crackers are made in the form of a body of revolution, for example, rollers.

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