RU2464470C2 - Shutoff and control gate valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: shutoff and control gate valve includes body with supply and discharge branch pipes with seats installed in them and with shutoff member, for example damper, which is arranged between them. Damper interacts at closing with bearing plate with shoulders, which is spring-loaded and installed in lower part of the housing; the above shoulders restrict the stroke of bearing plate at opening of the damper. Bearing plate is integral with working surface interacting with shutoff member; the above working surface is congruent to the surface of shutoff member. Besides, projected area of bearing plate in normal section to vertical axis of gate valve at equal width with shutoff member is at least 90% of similar projected area of the latter. Working surfaces of bearing plate and shutoff member are profiled.

EFFECT: higher operability and operating reliability of gate valve at operation with carried media having solid inclusions of various nature.

3 cl, 3 dwg

Description

The invention relates to mechanical engineering, namely to valve engineering, and can be used as a shut-off and control device in pressure pipelines for various purposes.

Known locking and regulating valve (see SU 1624224 A1, F16K 3/316), containing a solid flat with a through-hole locking and regulating gate, interacting with saddles installed in the housing and sealed relative to the latter. The gate is controlled by the spindle associated with the drive.

The disadvantages of the known design include erosion (erosion wear) of the edges of the sealing field of the saddle and, as a result, loss of valve tightness.

A gate valve is also known (see patent GB 772843 A, class F06K - prototype), comprising a housing with inlet and outlet nozzles into which the rings are screwed, the sealing fields of the latter interact when closing with the counter sealing fields of the wedge and the plugs spring-loaded relative to the screw screwed into the housing spring-loaded parts of the heel strung together on a pin mounted on a cork and missing inside the first mentioned spring.

When the shutter bolt opens, part of the heel under the action of the spring closes the limited sector of the sealing field of the saddle, and the shoulders of the parts of the heel rest on the outer diameter of the sealing field of the saddle.

The disadvantages of the known solution include the low reliability of the double heel, due to the possibility of clogging the changing gaps between the movable spring-loaded parts of the heel with solid particles inherent in almost any conductive medium, i.e. failure to fulfill the functions of protecting the sealing fields of the seats.

The technical task of the present invention is to improve the operability and reliability of the shutter when working with conducted media having various kinds of solid inclusions.

The problem is solved in that the heel is made integral with the working surface interacting with the locking organ, congruent surface of the latter, the heel area in the normal section with an equal width with the locking organ is at least 90% of the same area of the latter, while the working surface of the heel and the locking organ is made profiled.

Figure 1 shows a longitudinal section of a shut-off and control valve; figure 2 is a section along aa in figure 1; figure 3 is a section along BB in figure 1 with the gate raised.

The valve consists of a housing 1 with a supply pipe 2 and a discharge pipe 3, in which respectively an inlet seat 5 and an outlet 6 are located, sealed by a sealing element 7 in the housing 1, interacting on two sides with a gate 8 controlled by the spindle 9. Profiled working area 10 the gate 8 interacts with the reciprocal profiled working zone 11 of the whole heel 12 with the shoulders 13, spring-loaded relative to the plug 14 installed in the housing 1, and the working surface of the heel 12, interacting with the working the surface of the gate 8, congruent to the latter, while its central part is concave with a radius equal to the radius of the sealing field of the saddle 6, which is equal to the radius of the central part of the gate 8, turning smoothly on both sides into inclined planes 15 with an angle of inclination of the corresponding counter lateral surfaces of the gate 8.

Shut-off and control valve operates as follows.

Gate valve opening.

By means of a drive (not shown in Fig.), The spindle 9 raises the gate 8, while the heel 12 under the action of the spring rises up to the stop of the shoulders 13 in the seats 5 and 6 and closes flush with the passage channel the lower part of the sealing fields of the seats 5. In the resulting and constantly increasing when the valve opens, the gap between the working profiled surfaces 10 of the gate 8 and 11 of the heel 12 receives a conductive (adjustable) medium. With a fully open passage of the valve, the gate 8 does not come out of contact with the seats 5 and 6. And the lateral inclined surfaces 15 of the heel 12 increase the area of the sealing fields of both the input 5 and the output 6 of the seats, which is protected from the effects of a conductive medium containing solid particles.

The valve closes in the reverse order. When the profiled surfaces 10 of the gate 8 and 11 of the heel 12 are in contact, the latter lowers all the way to the bottom of the plug socket 14, while the gate completely blocks the valve passage, and the force created by the conducted medium equal to the product of the passage area of the inlet pipe 2 by the pressure of the conducted medium gate 8 to the sealing field of the seat 6.

The valve is closed.

Valve control.

Under the control of the spindle 9, the gate 8 rises together with the fifth 12 up to the stop of the shoulders 13 in the seats 5 and 6, the heel stops and closes the significant lower part (intensively erosion-worn) of the sealing field of the seat 6. With the further raising of the gate 8 between the working profiled surfaces 10 of the gate 8 and 11 of the heel 12, a gap is formed that increases as the gate 8 is raised, along which the conducted (adjustable) medium enters, while ensuring the necessary valve capacity, which is also promoted by the pros lined working surfaces 10 of the gate 8 and 11 of the heel 12.

When the passage is completely opened (the gate is in its highest position and does not come out of contact with the seats, and the heel 12 with the inclined surfaces 15 closes a significant area of the sealing fields of the seats, there is practically no pressure drop (pressure difference of the conducted medium at the inlet and the outlet). the gate again provides the necessary pressure drop, and the working profiled surface 10 of the gate 8 and 11 of the heel 12 while reducing the conditions for the occurrence of cavitation mode.

Due to the fact that the heel is made whole, and its working surface interacting with the gate is congruent to the surface of the latter, while its normal cross-sectional area is at least 90% of the same gate area with equal width, which ensures increased working capacity, and the execution of working surfaces with profiled ones reduces the likelihood occurrence of the cavitation regime of the expiration of the working medium, which increases the reliability of the shutter.

Claims (3)

1. Shut-off and regulating valve, comprising a housing with inlet and outlet pipes with saddles installed in them and with a locking element between them, for example, a gate that interacts when closed with a spring that is spring-loaded relative to the lower part of the housing and has shoulders restricting the stroke when opening the valve the latter, characterized in that the heel is made integral with the working surface of the congruent surface of the latter interacting with the locking organ. 2. The valve according to claim 1, characterized in that the projection area of the heel in normal section to the vertical axis of the valve with an equal width with the locking member is at least 90% of the same projection area of the latter. 3. The valve according to claim 1, characterized in that the working surfaces of the heel and the locking element are profiled.

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