RU2250404C1 - Bellows valve - Google Patents

Abstract

FIELD: valving.

SUBSTANCE: bellows valve comprises housing, valving member, and rod sealed with a bellows. The bellows is connected with the housing through the bellows bushing. The bushing is provided with elongated openings of the same lengths. The openings are lengthened along the axis of the rod. The pin is mounted in the rod perpendicular to its axis. The ends of the pin are set into the openings. The elongated openings are made of grooves and arranged from the side of the bottom face of the bellows bushing. The bellows bushing embraces the bellows and the junction of the rod with the valving member shifted with respect to the bellows level by the length of the elongated grooves. The top walls of the elongated grooves restrict the stroke of the valve in the "open" position. The pin is mounted at 90° with respect to the axis of the branch pipes of the valve in the openings in the valving member and in the opening in the rod which is coincident with it. The opening in the rod is elongated in the direction of the bellows along the axis of the rod to define a guaranteed space when the pin is inside it.

EFFECT: enhanced reliability.

2 dwg

Description

The present invention relates to the field of valves and can be used in chemical, energy, oil and gas and other industries.

A known valve (Handbook of pipeline fittings designer. - L .: Engineering, 1987, p. 91, Fig. 3.34), comprising a housing, a rod with a locking member connected to the spindle and held from turning by a pin installed in the opening of the locking member and both ends in contact with the longitudinal grooves in the bellows sleeve.

The disadvantage of this valve is its large dimensions due to the non-compact arrangement of the main components, including the spindle-stem connection unit and the bellows assembly, as well as a large number of parts that reduce the reliability of the valve.

Known valve (copyright certificate SU No. 1687980, F 16 K 1/00, 06/29/89), comprising a housing, a cover, a sleeve with a gland assembly, a rod connected by a pin with a locking body, and a pressure gland with external protrusions placed in grooves lids, and with a longitudinal groove in which a key is mounted, connected to the rod and holding it from rotation.

Known valve (certificate for utility model RU No. 26623, F 16 K 1/00, 05/30/2002) containing a housing, a cover, a sleeve, a bellows, a glass and a locking element connected to the rod with a pin.

The disadvantage of the above devices is the lack of reliability of the connection of the rod with the locking element due to the absence of restrictions on the loss of the connecting pin under the influence of the flow of the working medium in the pipeline and the transmission of axial force to the pin when closing the valve.

The closest to the proposed design solution is a bellows valve (Utility Model Certificate RU No. 28904, F 16 K 1/50, 12/19/2002) containing a housing, a stem, a bellows, a locking member and a bellows sleeve with longitudinal grooves into which the pin is inserted associated with the rod and holding it from rotation.

The disadvantage of the above device is that the locking element is connected by welding with a bellows and rigidly connected to the rod, excluding its replacement during valve repairs and unreliable restriction of the working stroke of the locking element due to the fact that the pin in the “open” position abuts against the end face of the rotating bushings.

The technical problem that was posed during the development of this invention:

- optimization of valve design;

- improving valve reliability;

- the possibility of replacing the locking element during repairs of the bellows valve.

The problem is solved due to the fact that the bellows valve, comprising a housing, a locking member and a rod sealed with a bellows, which is connected to the housing by a bellows sleeve having the same lengthwise elongated holes elongated along the axis of the rod, a pin is installed in the rod perpendicular to its axis , the ends of which enter these holes, according to the invention, the oblong holes are made in the form of grooves and are located on the side of the lower end of the bellows sleeve, which covers the bellows and the junction of the stem with a lock organ located below the level of the bellows by the length of these oblong grooves, while the upper walls of the oblong grooves limit the valve stroke in the “OPEN” position, and the pin is installed at an angle of 90 ° to the axis of the bellows valve nozzles in the holes in the locking body and combined with them a hole in the stem, which is made elongated in the direction of the bellows along the axis of the stem so that it forms a guaranteed clearance when the pin is in it.

Figure 1 presents the bellows valve, figure 2 - section aa in figure 1.

The bellows valve comprises a housing 1; stock 2; locking body 3; a bellows 4 connected by welding with a bellows sleeve 5 and with a rod 2; rack 6; the bushing 7 and the handle 8. The locking element 3 is connected to the rod 2 by means of a pin 9, both ends of which interact with the elongated grooves 10 of the bellows sleeve 5, and the axis of the pin is 90 ° to the axis of the pipe 11 of the housing 1, and the hole 12 the rod 2 is made elongated along the axis of the rod in the direction of the bellows 4, forming a guaranteed gap 13, while the upper end surfaces 14 of the elongated grooves 10 are an abutment for the pin 9 when the locking element 3 reaches the “OPEN” position.

The bellows valve operates as follows: when the handle 8 is rotated, the bushing 7 generates a force along the stem 2, which moves the locking member 3, operating the valve. The rod 2 is connected to the locking element 3 by means of a pin 9, the ends of which enter the elongated grooves 10 of the bellows sleeve 5. To avoid transmitting axial force to the pin 9 when closing the valve, the hole 12 in the rod has an elongated profile, forming a guaranteed clearance 13. When reaching the locking body position “OPEN” the ends of the pin 9 abut against the end surfaces 14 of the elongated grooves 10 of the bellows sleeve 5.

The bellows valve provides:

1. Simplification and optimization of the design due to the fact that the pin that holds the rod from rotation, and the bellows from twisting, simultaneously acts as a connecting element between the locking element and the rod.

2. Improving the reliability due to:

- eliminating the possibility of the pin falling out under the influence of the flow of the working medium, due to the location of the pin at an angle of 90 ° to the axis of the nozzles;

- exclusion of transmission of axial force to the pin when closing the valve due to the presence of a guaranteed clearance above the pin in the rod;

- exclusion of the rotating part as a pin stop when the valve reaches the “OPEN” position due to the pin being in contact with the stop in the upper walls of elongated grooves.

3. The ability to replace the locking element during repairs of the bellows valve by connecting the rod to the locking element using a pin.

Claims (1)

A bellows valve comprising a housing, a locking member and a bellows-sealed stem that is connected to the housing by a bellows sleeve having oblong holes of equal length elongated along the axis of the stem; a pin is installed in the rod perpendicular to its axis, the ends of which enter these holes, characterized in that the oblong holes are made in the form of grooves and are located on the side of the lower end of the bellows sleeve, which covers the bellows and the junction of the rod with the locking member, offset below the level of the bellows by inu of these elongated grooves, while the upper walls of the elongated grooves limit the valve stroke in the “open” position, and the pin is installed at an angle of 90 ° to the axis of the bellows valve nozzles in the holes in the shut-off element and the hole in the stem aligned with them, and the hole in the stem made elongated in the direction of the bellows along the axis of the rod so that forms a guaranteed gap when the pin is in it.

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