JPH0434029B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a sealant fitting used for injecting a sealant into a seat portion or a stem seal portion of a ball valve, plug valve, etc. to ensure the sealing performance of the portion.

[Conventional technology]

Normally, this sealant fitting is screwed into an appropriate position on the valve and fixed to serve as a sealant injection port. Sealant is injected through this injection port to maintain the sealing properties of the valve seal and stem seal. To explain conventional sealant fitting according to FIG. 6, a body 50 having a flow hole 56
A sealant injection part 51 is provided at one end, a threaded connection part 52 is provided on the outer periphery of the other side, and a locking part 53 is formed at the open end on the sealant injection part 51 side.
It has a structure in which a ball 54, which is fixed to a ball 3, is resiliently supported by a spring 55, and this is widely known.

[Problem to be solved by the invention]

However, the above sealant fixing
Since the head plane of the sealant injection part 51 is always exposed, this part is easily damaged and dust is easily attached. For this reason, if the head coupler of the sealant injector is connected to the flat part of the head when injecting the sealant, this connection part may be damaged or dust may be trapped, so the sealant is not allowed to flow outside from this part. There was a drawback that it leaked and the injection of sealant into the valve became uncertain.
In addition, dust accumulates on the upper surface of the ball 54, which is the sealant injection port, and this dust is injected together with the sealant into the valve seal or stem seal, damaging the parts or preventing the sealing function from being effective. The present invention provides a sealant fitting that solves these conventional drawbacks, and aims to effectively ensure the sealing performance of the valve seat and stem seal by injection of sealant. be.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a connecting portion on one side of a cylindrical body with both ends open, and a sealant injection portion with a flat end surface on the other end, and A protruding part is formed on the inner circumferential surface of the approximately central part, and the male threaded part of the cap is screwed into the through hole on the side of the sealant injection part in the body bordering on this protruding part, and the lower end of this male threaded part is screwed. The formed conical part is brought into contact with the tapered surface of the protruding part, and the lower surface of the flange formed at the upper end of the cap is brought into surface contact with the flat surface of the sealant injection part via the gasket, and the flange is brought into contact with the flat surface of the sealant injection part. A protruding ring formed hanging from the lower periphery of the sealant injection part is fitted onto the side surface of the sealant injection part, and a check valve ball is further pressed onto the tapered surface formed on the connecting part side of the protruding part via a coil spring. This is the sealant fitting in contact.

【Example】

Embodiments of the present invention will be described below based on the drawings. Figure 1 is a longitudinal cross-sectional view of the sealant fitting fixed to the ball valve, Figures 2 and 3 are enlarged cross-sectional views showing the sealant fitting installed on the seat and stem seal parts, respectively, and Figure 4 is the sealant fitting fixed to the ball valve. Fig. 5 is a half-cut sectional view of the fitting with the cap and gasket removed. A connecting part (male screw) 3 for screwing into a valve such as a ball valve 2 is provided on the lower outside of the body 1, and a button head shape is provided on the upper outside of the body 1 for assembling a head coupler 4 of a sealant injector when injecting sealant. ing. This button head shape refers to a shape in which the sealant injection part 5 at the end of the body 1 is provided with a neck part 6 whose diameter is reduced from the end. It forms a flat surface 7 for contact. The inside of the body 1 is a through hole 9 in which a protruding part 8 having an inwardly facing truncated conical cross section is formed on the inner peripheral surface of the approximately central part, and tapered surfaces are provided on both sides of the protruding part 8. 8a and 8b are formed. Further, a threaded part 10' is provided in the through hole 9a of the body 1 on the side of the sealant injection part 5 with this protruding part 8 as a boundary, and the male threaded part 10a of the cap 10 is screwed into this threaded part 10'. A conical part 11 is formed at the lower end of the male threaded part 10a, and this conical part 11 is provided so as to come into contact with the tapered surface 8a of the above-mentioned protruding part 8 to perform a stop valve function. Furthermore, cap 1
A flange 12 having a hexagonal surface on the outer periphery is provided at the upper end of the sealant 0, and the lower surface 13 of the flange 12 is provided in surface contact with the flat surface 7 of the sealant injection part 5 with an elastic gasket 14 interposed therebetween. Furthermore, the collar part 1
A protruding ring 12a formed hanging from the lower peripheral edge of the sealant injection part 5 is fitted onto the side surface of the sealant injection part 5, and
The conduction hole 9b on the connection part 3 side of the body 1
A check valve 15 is installed inside. The check valve 15 shown in this example includes a ball 16 that contacts the tapered surface 8b of the protrusion 8 and a coil spring 17 that is compressed to push up the ball 16. The lower end of the coil spring 17 is connected to the body 1. It is supported by the lower end reduced diameter portion 18 of the through hole 9b. In FIGS. 1 and 2, 19 is a threaded portion formed in the valve body 20, 21 is a check valve built into the valve body 20 and used in conjunction with the sealant fitting in the present invention, and 22 is a valve body. A guide hole provided in the body 20, 2
3 is a guide hole provided in the seat retainer 24, 25 is a ball seat, 26 is a ball having a through hole 27,
28 is a stem, and 37 is a seat spring. 1 and 3, 29 is a ground plate, 30 is a check valve built into the ground plate 29, 31 is a guide hole formed in the ground plate 29, 32 is an O-ring, 33 is a thrust washer, 34 is a stem washer, and 35 is a The stem bearing 36 is a threaded portion formed on the ground plate 29. In FIG. 5, 38 is an inner cylinder which is pushed downward by a spring inside the head coupler 4, and 39 is a connecting collar for the head coupler 4. Next, the operation of the above embodiment will be explained. When injecting sealant into the seat or stem seal of ball valves, plug valves, etc.
The cap 10 is extracted from the threaded part 10' of the body 1 by rotating the flange 12, and the elastic gasket 14 is removed, and then the head coupler 4 provided at the tip of the sealant injector is removed, as shown in FIG.
The connecting collar 39 is hung on the neck 6 of the sealant injection part 5 to ensure that the flat end of the inner cylinder 38 of the head coupler 4 is brought into surface contact with the flat surface 7 of the sealant injection part 5. In this state, when the sealant injector is operated to feed sealant at high pressure, this high pressure pushes the inner cylinder 38 of the head coupler 4, causing the distal end surface of the inner cylinder 38 and the flat surface 7 of the sealant injection part 5 to Furthermore, since the flat surface 7 is free from damage and dirt, leakage of the sealant to the outside from this region is prevented. Next, the sealant flows into the body 1, presses the ball 16 of the check valve 15 downward from the through hole 9a, and flows into the through hole 9b. Another check valve 21 is pressed to connect the guide hole 22 to the guide hole 23 of the seat retainer 24 and discharge from the opening on the ball 26 side of the seat retainer 24 to ensure the sealing of the ball seat 25 portion. Also, in FIG. 3, the sealant is applied to the body 1.
A check valve 30 built into the valve body 20 is pressed below the valve body 20, the liquid passes through the guide hole 22, and is discharged to the stem seal portion to ensure the sealing performance of the portion. The above-mentioned check valve 15 and check valve 2
Nos. 1 and 30 prevent backflow of sealant due to internal pressure of the valve when the injection pressure is reduced during sealant injection, and prevent backflow of sealant or leakage of internal fluid due to internal pressure of the valve in cases other than injection. . Next, when the sealant injection work is completed, the head coupler 4 is removed from the sealant injection part 5 of the body 1, and the male threaded part 10a of the cap 10 that has been extracted is inserted into the threaded part 10' of the body 1.
and after interposing the elastic gasket 14 between the flat surface 7 and the lower surface 13 of the flange 12,
When the collar portion 12 is rotated, the male threaded portion 10a is screwed into the threaded portion 10' and screwed into the state shown in FIG. Furthermore, the conical portion 11 of the cap 10 reliably contacts the tapered surface 8a of the protruding portion 8 to perform the stop valve function of this portion, and furthermore, the triple sealing function of the check valve 15 and the gasket 14 is achieved. This reliably prevents backflow of the sealant or leakage of the internal fluid due to the internal pressure of the valve, and also completely covers the flat surface 7 of the sealant injection part 5 to prevent dust from adhering to it. In the above explanation, a button head type sealant fitting was described, but the shape of the sealant injection part of the sealant fitting of the present invention varies depending on the shape of the head coupler of the sealant injector used, and is limited to the button head type. It's not something you do.

【Effect of the invention】

As is clear from the above, according to the present invention, during normal times when sealant is not injected, the stop valve mechanism by tightening the check valve and the cap as well as the triple sealing function of the gasket allow the sealant to be injected by the internal pressure of the valve. In addition to completely preventing backflow of the gas and leakage of the internal fluid, the flat upper end surface of the body is always protected by the gasket, and the protruding ring of the cap surrounds the gasket to prevent leakage from this part. This prevents dust from entering the head coupler, so there is no risk of damage to the flat surface or contamination due to adhesion of dust, so even when injecting sealant, the contact surface between the flat surface and the inner cylinder of the head coupler is completely protected. Also, since the upper end surface of the body is not dirty, there is no risk of dust being injected together with the sealant into the seat or stem seal of the valve, etc. It has excellent effects such as preventing damage to the parts and effectively ensuring sealing performance.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view showing the sealant fitting of the present invention fixed to a ball valve;
Fig. 2 is an enlarged cross-sectional view showing the state in which the sealant fitting is provided in the seat part of the above, Fig. 3 is an enlarged sectional view showing the state in which it is provided in the stem seal part of the above, and Fig. 4 is a half-section of the sealant fitting in the present invention. 5 is a half-cut sectional view showing the same fitting with the cap and gasket removed, and FIG. 6 is a half-cut sectional view showing a conventional sealant fitting. DESCRIPTION OF SYMBOLS 1...Body, 3...Connection part, 5...Sealant injection part, 7...Flat surface, 8...Protrusion part, 8
a, 8b...Tapered surface, 9, (9a, 9b)...
Conduction hole, 10...cap, 10a...male thread, 11...conical part, 12...flange, 12a...
...Protruding ring, 13... Bottom surface, 14... Gasket,
15...Check valve, 16...Ball, 17...Coil spring.

Claims (1)

[Claims] 1 A connecting part is provided on one side of a cylindrical body with both ends open, a sealant injection part with a flat end surface is provided on the other end, and a protruding part is provided on the inner circumferential surface of the body approximately in the center. The male threaded part of the cap is screwed into the through hole on the side of the sealant injection part in the body with this protruding part as a boundary, and the conical part formed at the lower end of this male thread is connected to the protruding part. The lower surface of the flange formed at the upper end of this cap is brought into surface contact with the flat surface of the sealant injection part via the gasket, and the protruding ring formed hanging down from the lower periphery of the flange is brought into contact with the tapered surface of the cap. is fitted onto the side surface of the sealant injection part, and a check valve ball pressed by a coil spring is brought into contact with a tapered surface formed on the connecting part side of the protruding part. Fitzteing.