RU2799162C1 - Ball valve with extending seats - Google Patents

Abstract

FIELD: pipeline valves.

SUBSTANCE: specified movement of the seats occurs by means of a gear transmission that transmits the rotation of the spindle through the couplings to the sliding seats.

EFFECT: creating a ball valve with sliding seats, which has increased reliability and service life, due to an increase in the number of opening-closing cycles of the valve with tightness on the valve gate, by eliminating the abrasive effect of the ball plug on the seats by moving the seats away from the ball plug during its rotation when closing or opening the valve.

3 cl, 7 dwg

Description

The invention relates to pipeline fittings, namely to ball valves with sliding seats, and is intended to control the flow of the working medium in pipelines.

Closest to the claimed invention is a ball valve (patent CN 1614271, application CN 20031108434, publ. 05/11/2005), containing a body with inlet and outlet nozzles, in which floating seats are placed, a ball plug installed between the floating seats, equipped with seals, and made with the possibility of shutting off the flow of the working medium when the plug is turned by a spindle equipped with a drive handle. This ball valve is selected as a prototype of the claimed invention.

The disadvantages of the prototype ball valve are low performance due to difficult control due to the constant increased load on the valve handle and low durability due to continuous friction between the plug and the seat seals.

The technical result of the invention is the creation of a ball valve with sliding seats, which has increased reliability and service life, due to an increase in the number of opening-closing cycles of the valve with tightness on the valve gate, by eliminating the abrasive effect of the ball plug on the seats by moving the seats away from the ball plug during its rotation when closing or opening the tap.

The stated technical result is achieved by creating a ball valve with sliding seats, containing a body with inlet and outlet nozzles in which sliding seats are placed, a ball plug mounted on a support between sliding seats, equipped with seals, and made with the possibility of shutting off the flow of the working medium when the ball is turned plugs through the transmission link by a spindle, characterized in that it also contains couplings that are kinematically connected to the spindle and to the seats in the seat extension mechanism, while the spindle has the first toothed element, one end surface of the coupling has a second toothed element, the other opposite end surface of the coupling has the first seats, made with the possibility of accommodating springs, and the side surface of the coupling has recesses, made with the possibility of accommodating fingers; one end surface of the seat has second seats, made with the possibility of accommodating springs, and the side surface of the seat has profiled grooves, made with the possibility of placing fingers; the first gear member is engaged with the second gear member to form a gear train configured to transfer the rotation of the spindle to the rotation of the clutch; the seat is inserted inside the coupling, while the springs are placed in the first and second seats with the possibility of preloading and ensuring constant engagement of the first and second toothed elements, and the fingers are placed inside the recesses and profiled grooves with the possibility of transferring the rotation of the coupling to the movement of the seat relative to the plug on the inclined section of the profiled groove.

In the preferred embodiment of the ball valve, a radially elongated groove is made in the lower part of the spindle, into which the pin of the ball plug is inserted with the mating part, and the support has a curved surface designed to provide backlash in a given range of rotation of the spindle, while in the initial part of the trajectory of rotation of the spindle, the pin ball plug freely passes through the groove, while not transferring the spindle rotation to the plug, and after the pin abuts against the end of the groove, the spindle rotation force begins to be transmitted to the ball plug, while the ball plug rotates.

In the preferred embodiment of the ball valve, the spindle is provided with an actuating handle or mechanical drive.

For a better understanding of the claimed invention, the following is a detailed description with the corresponding drawings.

Fig. 1. Ball valve with sliding seats (general view), made according to the invention.

Fig. 2. Spindle ball valve with sliding saddles, made according to the invention: a) side view; b) bottom view.

Fig. 3. Saddle ball valve with sliding saddles, made according to the invention: a) side view; b) side sectional view.

Fig. Fig. 4. Clutch of the mechanism for expanding the seats of a ball valve with sliding seats, made according to the invention: a) top view; b) side view.

Fig. Fig. 5. Support of the ball plug of a ball valve with sliding seats, made according to the invention: a) top view; b) side view.

Fig. 6. The mechanism for expanding the seats, made according to the invention.

Fig. 7. The mechanism for delaying the rotation of the ball plug, made according to the invention.

Elements:

1 - body;

2 - branch pipe;

3 - ball plug;

4 - sliding saddle;

5 - spindle;

6 - support;

7 - clutch;

8 - drive handle;

9 - groove;

10 - pin.

Consider an embodiment of the claimed ball valve with sliding seats (Fig. 1 - 5). A ball valve with sliding seats contains a body 1 with inlet and outlet pipes 2, in which sliding seats 4 are placed, a ball plug 3 mounted on a support 6 between sliding seats 4, equipped with seals. The spindle 5 is equipped with a drive handle 8.

Case 1 has two nozzles 2.

The spindle 5 has the first toothed element designed to transfer forces to the couplings 7 and ensure the expansion of the seats.

Each saddle 4 has profiled grooves around the entire circumference of the outer surface, which interact with the sleeves 7 with the help of plug-in fingers.

One end surface of the coupling 7 has gear elements that are in constant contact with the spindle 5, through which the force is transmitted to rotate the coupling 7. The other opposite end surface of the coupling 7 has seats for springs that provide preload for constant engagement of the teeth of the coupling 7 and spindle 5.

On the lateral cylindrical surface of the coupling 7, there are recesses for installing plug-in fingers for pressing out the seats 4.

The claimed ball valve with sliding seats operates as follows.

When a force is applied to the spindle 5, it rotates, while the rotational force from the spindle 5 is transmitted through the gear to the couplings 7.

When the couplings 7 rotate, the plug-in fingers move along the profiled channels of the seats 4, and on the inclined section of the channel profile they begin to push the seats 4 apart from the center of the ball valve, thereby disengaging the plug 3 from the seats 4.

With further rotation of the spindle 5, the ball plug 3 rotates until the flow part of the valve is fully opened.

To exclude friction of the ball plug 3 on the seat 4 at the initial moment of their movement relative to each other, the design of the claimed valve provides a mechanism for delaying the rotation of the ball plug 3. In the lower part of the spindle 5, a radially elongated groove 9 is made, into which the pin 10 of the ball plug is inserted with the mating part , and the plug support has a curved surface that provides backlash in the specified range of spindle 5 rotation. the end of the groove 9, the force of rotation of the spindle 5 begins to be transmitted to the ball plug 3, while the ball plug 3 rotates.

Although the embodiment of the claimed invention described above has been set forth for the purpose of illustrating the claimed invention, it will be clear to those skilled in the art that various modifications, additions and substitutions are possible without departing from the scope and spirit of the claimed invention as disclosed in the appended claims.

Claims (3)

1. A ball valve with sliding seats, containing a body 1 with inlet and outlet pipes 2, in which sliding seats 4 are placed, a ball plug 3 mounted on a support 6 between sliding seats 4, equipped with seals, and configured to shut off the flow of the working medium when rotation of the ball plug 3 through the transmission link by the spindle 5, characterized in that it also contains couplings 7, which are kinematically connected to the spindle 5 and to the seats 4 in the seat extension mechanism, while the spindle 5 has the first gear element, one end surface of the coupling 7 has the second toothed element, the other opposite end surface of the coupling 7 has the first seats made with the possibility of placing springs, and the side surface of the coupling 7 has recesses made with the possibility of placing fingers, one end surface of the seat 4 has the second seats made with the possibility of placing springs, and the side surface of the seat 4 has profiled grooves, made with the possibility of placing fingers, the first toothed element is engaged with the second toothed element, with the formation of a gear, made with the possibility of transferring the rotation of the spindle 5 to the rotation of the coupling 7, the seat 4 is inserted inside the coupling 7, in this case, the springs are placed in the first and second seats with the possibility of preloading and ensuring constant engagement of the first and second toothed elements, and the fingers are placed inside the recesses and profiled grooves with the possibility of transferring the rotation of the coupling 7 to the movement of the seat 4 relative to the plug 3 on the inclined section of the profiled groove. 2. A ball valve according to claim 1, characterized in that a radially elongated groove 9 is made in the lower part of the spindle 5, into which the pin 10 of the ball plug 3 is inserted with the mating part, and the support 6 has a curved surface designed to provide backlash in a given range rotation of the spindle 5, while in the initial part of the trajectory of the rotation of the spindle 5, the pin 10 of the ball plug 3 freely passes through the groove 9, while it does not transmit the rotation of the spindle 5 to the plug 3, and after the pin 10 abuts against the end of the groove 9, the rotation force of the spindle 5 starts be transmitted to the ball plug 3, while the ball plug 3 rotates. 3. Ball valve according to claim 1, characterized in that the spindle 5 is equipped with a drive handle or a mechanical drive.

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