RU2244864C1 - Check valve - Google Patents

Abstract

FIELD: valving.

SUBSTANCE: check valve has housing with rigid sealing sections, rotatable valving member, and seat. The rigid sealing sections of the housing are made of double-sided ring conical projections arranged over periphery. The small bases of cones point in opposite directions. The valving member is made of a round flexible disk. The flexible disk is made of the periphery and central parts. The periphery part is made of a ring. The longitudinal section of the ring is a rectangular triangle whose hypotenuse faces the center. The central part is made of ball segment. The segment of the ball is reinforced from the side of its base by round metallic plate. The periphery part is connected with the central cross-piece. The thickness of the cross-piece decreases from its axis of symmetry to the edge. The inner side of the housing is provided with a bore. The seat is stepwise and has diffuser at the inlet.

EFFECT: enhanced reliability.

6 dwg

Description

The invention relates to the field of pipe fittings and is intended to prevent the flow of liquid from the high cavity into the low pressure cavity of the main pipeline. It will find application in pipeline systems for maintaining reservoir pressure during oil production, as well as in other pipeline systems.

Known check valve comprising a housing with a rigid conical sealing grooves and a saddle section, rigid sealing rings, a locking member, a guide and a spring [1].

The disadvantages of the device:

- unsatisfactory operational reliability due to a relatively rapid violation of the contacting surfaces of the saddle section and the locking element, both due to the skew of the latter and due to their wear under the influence of mechanical particles;

- significant pressure loss in the valve area due to the stepwise transition of the fluid from the discharge cavity of the pipeline through the valve channels into its injection cavity, accompanied by shock.

The closest in technical essence to the proposed one is a non-return valve, comprising a housing with rigid sealing sections and rings, a rotary locking element and a seat [2].

Significant disadvantages of the device are:

- poor operational reliability due to a violation of the tightness of the joint between the locking member and the seat due to the formation of microchannels on the sealing surface of the locking member when pumping liquid with an increased percentage of sand and fibrous particles and the latter getting on the sealing surface;

- the high complexity of manufacturing due to the low technology of hard sealing rings and high requirements for their manufacture;

- significant pressure loss in the valve section due to the small size of the valve cross-section for given pipe diameters.

The objective of the invention is to provide a valve having high operational reliability, low manufacturing complexity and low pressure losses.

This problem is solved by the proposed non-return valve, comprising a housing with rigid sealing sections, a rotary locking element and a seat.

New is that the rigid sealing sections of the housing are made in the form of bilateral circumferential conical protrusions located on the periphery, the small bases of the cones of which are directed in opposite directions, and the locking member is a round elastic disk consisting of peripheral and central sections, and the peripheral one is made in the form rings, the profile of which in the longitudinal section is in the form of a right triangle with the hypotenuse facing the center, and the central one is a segment of the ball reinforced with its foundations are a round metal plate; the peripheral section is smoothly connected to the central jumper of limited width, the thickness of which decreases from the axis of its symmetry to the edge of the jumper; the housing on the inner surface from the liquid inlet side is provided with a bore having a shape adequate to the longitudinal section of the peripheral portion of the locking member; The saddle is made stepped with a diffuser section at the entrance.

Figure 1 shows a General view of the proposed non-return valve in longitudinal section.

Figure 2 is a section along aa of figure 1.

Figure 3 is a view of the valve in plan.

Figure 4 is a section bB of figure 3.

Figure 5 is a section along bb In figure 3.

In Fig.6 is a section along G-D of Fig.3.

The valve consists of a housing 1 (Fig. 1) with conical annular protrusions 2 and 3 located on the periphery, the small bases of the cones of which are directed in opposite directions, the locking member 4, which is a round elastic disk having a peripheral 5 and a central 6 sections connected between each other with a jumper 7 (Fig.3).

The peripheral section 5 is made in the form of a ring, the profile of which in the longitudinal section has the form of a right triangle with the hypotenuse facing the center.

The central section 6 is made in the form of a segment of the ball, reinforced from the side of its base with a round metal plate 8.

The housing 1 on the inner surface from the liquid inlet side is provided with a bore 9 having a shape adequate to the longitudinal section of the peripheral section 5 of the locking member 4.

The valve is equipped with a saddle 10 of a stepped shape having a diffuser portion 11 and a handle 12.

The valve operates as follows.

In the absence of a pressure differential between the cavities "a" and "b", the locking element 4 is in the initial position, i.e. adjoins the saddle 10. As soon as pressure appears in the cavity "a", the shut-off element begins to bend relative to the narrow girdle 13 (Fig. 3) of the jumper 7, and the greater the flow rate of the liquid through the gap, the more it deviates from the saddle 10. Upon occurrence equal pressure in the cavities "a" and "b", the shut-off body takes its original position.

Mounting the check valve.

The valve is introduced into the gap between the flanges 14 and 15 so that the conical protrusions 2 and 3 fit into the conical grooves of the flanges. After this, the studs (not shown in FIG.) Are tightened so as to create a tight contact on the conical surfaces. The non-return valve is ready for operation.

The proposed device allows you to:

- to increase operational reliability due to the fact that the self-sealing sections (edges) of the locking member reliably overlap the sealing surface of the saddle even if it has microchannels and fibrous particles;

- reduce the complexity of manufacturing due to the lack of design parts that are subject to high technological requirements;

- reduce pressure loss in the valve section, as its design allows you to increase its flow area and creates the conditions for a smoother fluid transition in the valve area.

Information used.

1. The analogue. Prospect LLC “TechSnabKomplekt” “Check valve type OK,” 2001, Udmurt Republic, Votkinsk, st. Lenin, d. 43, tel. (341-45) 3-35-27. (Copy attached).

2. The prototype. Prospectus of the production and commercial company Tekhnovek, 2001 (copy attached).

Claims (1)

The non-return valve, comprising a housing with rigid sealing sections, a rotary locking member and a seat, characterized in that the rigid sealing sections of the housing are made in the form of bilateral circumferential conical protrusions located on the periphery, the small bases of the cones of which are directed in opposite directions, and the locking member is round an elastic disk consisting of peripheral and central sections, and the peripheral one is made in the form of a ring, the profile of which in longitudinal section has the form of a rectangle an olny triangle with a hypotenuse facing the center, and the central one - a segment of the ball reinforced with a round metal plate from the base side, the peripheral section is smoothly connected to the central bridge of limited width, the thickness of which decreases from the axis of its symmetry to the edge of the bridge; the housing on the inner surface from the liquid inlet side is provided with a bore having a shape adequate to the longitudinal section of the peripheral section, the saddle is made stepwise with a diffuser section at the inlet.

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