JPS6237576A - Improved plastic lining plug-valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to an improved plastic lined plug valve that provides long service life with minimal maintenance costs. More particularly, the present invention relates to an improved stem seal suitable for use in such plastic-lined plug valves.

Plug valves have found wide application in handling a variety of fluids. For many applications, a particularly desirable form of plug valve is a so-called plastic-lined plug valve, where the plastic lining provides chemical resistance, which is desirable for many applications. Generally, such plug valves have a protruding handle secured to the plug that rotates the plug to allow the valve to open and close. Various techniques have been used to provide a seal around the stem of such plug valves. Such seals often require relatively high maintenance costs and
And while dynamic seals have often been used, these seals tend to leak during initial pressurization. Some plastic-lined valves are covered by U.S. Patent No. 3,1.
No. 57,195: No. 3.698,422; No. 3,
No. 703,910 and No. 3,916,943.

According to the present invention, the above-mentioned advantages and other advantages are achieved by a plug valve having the following configuration: a first valve part, a second end part, and a fluid passageway extending from the first end to the WJ2 end part. 0e, and a plug receiving cavity α′? formed by the valve body and extending substantially perpendicular to the axis of the fluid passage. )
(for valve bodies having a synthetic resin material coating); a handle (a) disposed within the fluid passageway and extending away from the valve body;
, a substantially flat sealing member disposed on the valve plug adjacent to the handle, and a substantially flat sealing member disposed on the sealing member and fixed to the valve body ω) in sealing engagement with the valve body. A bonnet (2
) in a plug valve including a plug having a synthetic resin material covering and a packing joint which is adjustable and positionable in the bonnet and extends around the handle into the passage of the bonnet; the connection between the plug and the handle; At a location adjacent to the point, the plug (T) forms a toroidal truncated conical surface with a large diameter adjacent to the plug and a small diameter adjacent to the handle; an aperture formed by a flexible seal member 3) of sufficient diameter to pass over the annular frusto-conical surface), and an inner diameter approximating the large diameter of the frusto-conical surface; It forms a locking ring θ9) with a substantially annular cup seal having a trapezoidal cross section; With a face, this cup seal has a rich circular shape +h
The ring (3) suppresses radial movement and is made of a pressure-deformable synthetic resin material, and is a rigid support ring 6B).
is located adjacent to the cup seal 65) and spaced apart from the valve plug; and a member (Q, 6) resiliently biasing the support ring 68) toward the valve plug.
2) A plug valve, characterized in that it comprises:

Further detailed features and advantages of the invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a valve according to the invention.

FIG. 2 is a partial cross-sectional view of the plug bonnet and seal assembly.

In FIG. 1, a schematic longitudinal cross-section of a plastic-lined replug valve, generally designated by the symbol 0Q, is shown. The valve αO has a valve book ■υ. This valve shaft forms a passage α9 extending between the first end α and the second end α◆. The inside of the main body 11) is lined with plastic lining α0. Plug storage cavity α with Honry 11 plastic coated plug (to) placed inside
71. As shown in FIG. 1, the plug is in the closed position. A seal member (c) is disposed over the plug αe and held in sealing engagement with a portion of the lining α0 by a valve bonnet. The valve bonnet is connected to the body by a plurality of bolts, only one of which is shown. The valve plug α$ has a tapered shape, and its larger diameter is placed adjacent to the seal (c). Adjacent to the seal (c), a plastic-covered handle (support) is attached to the plug αe. The packing foot is adjustably attached to the bonnet (a) by a plurality of bolts, two of which are shown. The operating handle assembly (support) is attached to the handle (7).

A live load handle seal assembly (b) is placed adjacent to the position where the handle and the plug join.

FIG. 2 shows a detailed cross-sectional view of the live load seal assembly 61 of FIG. This seal assembly (b) includes a valve plug applied to a synthetic resin thermoplastic material in full cooperation. This plug (6) is attached to the handle (to), and adjacent to the plug value)
An annular recess is formed in which a partial layer of the covering material scale of the plug (e) is placed. At a position adjacent to the plug and handle and the sheathing portion 5), the sheathing forms an annular truncated conical sealing surface.

A substantially flat seal member bulge surrounds the handle (A) and is adjacent to the truncated conical surface. This seal club Isao Hayashi is the first
It is almost the same as the seal member (c) in the figure, and is fixed to the valve body by the bonnet 4 during operation. A substantially annular locking ring Q9) is formed with a substantially cylindrical surface facing toward the sealing member. C47)
There is a thin flexible section of the sealing flap forming a sealing lip s3) which fits into the truncated conical sealing surface of the locking ring 0. Adjacent to the seal lip (b) and remote from the plug lip is a cup/sea bottle (5) made of a flexible plastic such as 47). The cup seal has a generally annular shape and a trapezoidal cross-section, and has one surface (06) disposed approximately parallel to and spaced apart from the surface (06) of the so-called cup seal. Face 0 1 away from Cup Sea Hong 5)
A cup seal support ring (to) is placed on the
The ring is preferably made of a metal such as steel and has an annular shape with a diameter approximating the diameter of the cup seal. Adjacent to the support ring is a first conical spring washer, which is often
eville) It is called a spring, and it is a cup.
Engage the support ring (g) away from the seal. A second conical spring washer [F] 2) is in contact with the washer 1) at a distance from the support ring layer. It is arranged around the thrust washer Sn4 and engages with the second washer at a position remote from the support ring G.

This thrust force has a cup-shaped shape,
The conical spring washer, the support ring, the cup seal, and the annular locking ring C49)' which is generally adjacent to the seal stopper. This thrust washer (64) is formed on the U-seal engaging annular flange (%)'. Thrust washer→Adjacent to the circle and separate from the conical spring washer, there is an anti-static washer ■, which engages with the metal of the handle to provide electrical contact with the handle.

This anti-static washer (9) packing presser (a)
is held in place by the

Bulbs according to the invention can be easily manufactured using a wide variety of rice-based materials. Most commonly, malleable iron and steel are used for the body, bonnet, packing foot, and plug. Although the body is generally lined by well-known injection molding techniques, the plug may also be lined by injection molding techniques.
Ru. The shape of the plug is usually not important. The configuration shown in FIGS. 1 and 2 is commonly referred to as a butter plug, and when in the closed position as shown in FIG. 1, the plug is released 180 degrees to each side and leaves the central vein. Alternatively, the plug can still be made of a more conventional design in which a passage is formed within the plug that extends approximately perpendicular to the axis of generation. Once the plug is coated by injection molding, the entire outer surface is machined to the desired dimensions. Advantageously, surfaces with a roughness of 8 to 16 micron inches have been found to be very satisfactory. Advantageously, the truncated conical surface when projecting onto the axis of the handle forms an angle of 80 to 45 degrees with the axis of the handle, preferably 55 to 65 degrees.
form an angle of degrees. The seal (21, 47) is preferably produced by machining. The sealing lip 3) of the seam M47) in FIG. 2 is advantageously relatively thin, for example 0.25
~0.65m works well. Cup seal (
g) is preferably manufactured from a flexible synthetic resin material.

Particularly desirable materials for these seals, liners, and plug coverings include fluorocarbon polymers, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, vinylidene chloride polymers, low density polyethylene, polyimbutylene, bar 70 loalkoxy st resins, Examples include natural rubber and perpenan.

The plug valve according to the invention provides a greatly improved operating life with minimal leakage and minimal maintenance costs.

As is clear from the above description, the present invention can be embodied in various changes and modifications different from those specifically described in the above description. For this reason, the above description is illustrative only and should not be considered or construed as limiting or limiting the invention, which is limited only by the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a valve according to the invention. FIG. 2 is a partial cross-sectional view of the plug bonnet and seal assembly. In the figure: 11... Valve body; 13... First end: 14-.
- Second end; 15... Passage; 16... Plastic lining; 17... Plug storage cavity; 18... Plug; 21... Seal; 22... Bonnet;
23, 28... Bolt; 25... Handle: 27... Packing foot; 29... Handle assembly; ,' 3
1... Seal assembly: 41... Plug; 42...
Covering; 44...Handle; 46...Truncated conical sealing surface; 4
7... Seal member: 49... Locking ring; 53...
・Seal groove; 55...Cup seal; 58...
・Support ring; 61, 62... Conical spring Washer: 64... Thrust washer; 66... Antistatic washer 1 Procedural amendment (Method) September 6, 1985 Commissioner of the Patent Office Michi Uga Section 1 Display of the case 1985 Patent Application No. 175979 2 Name of the invention Improved plastic lined plug/valve 3 Relationship with the case of the person making the amendment Patent applicant name Ji Dow Chemical Company 4, Agent 5, Subject of the amendment

Claims (1)

Claims: 1. a first end and a second end, a fluid passage (15) extending from the first end to the second end, and a valve body substantially perpendicular to the axis of the fluid passage; Valve body (with synthetic resin material coating) with an extending plug receiving cavity (17)
11); a handle (25) disposed within the fluid passageway and extending away from the valve body; a generally planar seal member (47) located adjacent the handle and above the valve plug; a bonnet (22) disposed and secured to the valve body (11) pressing the sealing member (47) in sealing engagement with the valve body and forming a generally centrally located stem storage passageway larger than the diameter of the stem (25); ); and a packing retainer (27) adjustably positionable in this bonnet and extending around the handle into the passage of the bonnet: At a location adjacent to the point of contact with the handle, the plug (18) forms an annular frusto-conical surface (46) with a larger diameter adjacent the plug and a smaller diameter adjacent the handle; 47
) of diameter sufficient to pass over the handle, and an aperture formed by a flexible sealing portion (53) that fits into the centrally located and annular frustoconical surface (46); A locking ring (49
); a cup seal (55) of generally annular shape with a trapezoidal cross section is disposed against the sealing member (47) and has a surface substantially parallel to the frustoconical surface (46);
This cup seal (55) is connected to the annular locking ring (49).
a rigid support ring (58) is disposed adjacent to the cup seal (55) and spaced apart from the valve plug; Attach the ring (58) to the valve
A plug valve characterized by comprising members (61, 62) that elastically press against a plug. 2. The valve according to claim 1, wherein the synthetic resin material is a fluorocarbon polymer. 3. The valve according to claim 1 or 2, wherein the annular locking ring (49) is integral with the sealing member (47). 4. The element elastically compressing the support ring (58) towards the valve plug (41) comprises at least one conical spring washer (61, 62) or the valve according to paragraph 3. 5. A valve according to any one of claims 1 to 4, comprising a washer (66) for providing an electrical connection between the valve handle (25) and the bonnet (22). 6. According to any one of claims 1 to 5, wherein the truncated conical surface (46) forms an angle of 55 to 65 degrees with the handle when it projects to the rotation axis of the handle (25). Valves listed.