JPS5811975Y2 - ball valve - Google Patents

Description

[Detailed description of the invention] As shown in Fig. 4, a conventional ball valve has a cylindrical opening into which a valve stem is inserted in the upper part of a valve box A having a fluid communication hole A in the center. A stepped part C is formed on the inner diameter side at the lower part of the valve body A, and a ball insertion part is formed in the valve box A below the cylindrical part mouth, and a ball 2 is stored in the insertion part. A packing hole attached to the valve body A is brought into contact with the valve stem, and a disc-shaped packing receiving plate is fixed concentrically to the lower part of the valve stem to be inserted into the cylindrical part opening, and the center part of the lower surface of the receiving plate is fixed to the valve stem. In this case, a protruding part 1 having a retaining part with a concave part of ball 2 is provided, the valve stem is inserted into the cylindrical part mouth, the protruding part 1 is engaged with the concave part of ball 2, and the cylindrical part mouth is inserted into the valve stem. A sealing ring and a seal retainer are installed on the stepped part between the inner circumferential surface and the center hole of the gland retainer is fitted to the upper part of the valve stem, and the gland retainer is bolted to the valve body. The tightening is fixed at A, and the operating handle of the ball 2 is attached to the upper end of the valve stem.

In addition, a flange cap B having a fluid communication hole in the center is joined to the side opening of the valve box A by gasket force, and the packing attached to the flange cap B is brought into contact with the circumferential surface of the ball 2. A Bordeaux is passed through the through hole of the cap B, and the Bordeaux is screwed and connected to the tapped hole of the valve case A, and the flange cap B is tightened and fixed to the valve case A.

The gasket that presses against the ball of a ball valve uses a rubber-like elastic body made of plastic to ensure sealing performance, and tetrafluoroethylene resin is particularly used for heat-resistant and corrosion-resistant applications.

However, even if the seal is pressed against the ball to ensure sealing performance, the seal may become deformed or worn during use, causing the seal to loosen and cause fluid leakage.

In this case, in the conventional ball valve shown in Fig. 4, the flange cap B is screwed back onto the valve body A, the flange cap B is separated from the valve body A, and the seal is replaced. is troublesome and wastes time.

Therefore, the present invention is a ball valve that can be used for a long period of time by constantly pressing the seal against the ball from the outside of the ball valve body with constant pressure, without having to replace it even if the seal is deformed or worn out. It provides:

The present invention will be explained below with reference to the drawings.

A indicates a valve body, and the valve body a has a valve chamber 1 which is open at the top.Fluid flow cylinders 2, 2 communicating with the valve chamber 1 are provided on both sides of the valve chamber 1, and one side of the valve chamber 1 A receiving seat 3 for juxtaposing a packing support ring, a packing crimping ring, and a packing is provided in the lower part of the valve chamber 1, and a fitting part 4 for fitting the packing is formed in the lower part of the other side of the valve chamber 1.

Reference numeral 5 denotes a circular packing support ring with one side tapered. It is installed on the provided catch seat 3.

Reference numeral 6 denotes a packing crimping ring whose outer diameter is smaller than the outer diameter of the packing support ring 5, and one side of which is tapered to match the tapered surface of the packing support ring 5. The wide part of the seal crimping ring 5 is brought into contact with the tapered surface of the seal ring 5, and a gap is formed between the narrow part facing downward and the seat 3.

Reference numeral 7 denotes an annular packing, and a retainer 8 is attached to the outer surface of the packing for reinforcement.The retainer 8 is brought into contact with the flat part of the packing crimping ring 6, and the retainer 8 is installed on the catch seat 3. be.

A reinforcing ring 9 attached to the outer surface of an annular packing 10 is fitted into a fitting part 4 for fitting a packing provided at the lower part of the other side of the valve chamber 1.

Reference numeral 11 denotes a ball inserted into the valve chamber 1 of the valve body a from above, and a seal 9 disposed on one side of the valve chamber 1 and a seal 10 disposed on the other side of the valve chamber 1 are brought into contact with the circumferential surface of the ball 11, respectively. It is.

Reference numeral 12 denotes an annular support stand provided on the upper surface of the fluid flow cylinders 2, 2 on both sides of the valve chamber 1. A valve cover C is placed on the support stand 12 with a gasket 13 interposed therebetween. A plurality of stud bolts 14 fixed to the valve cover C are inserted into through holes drilled in the valve cover C, and nuts 15 are screwed to fix the valve cover C to the support base 12.

A tapped hole is vertically drilled in the valve cover C at a position corresponding to the packing ring 6, and an adjustment bolt 17 whose lower end is formed into a rod-shaped portion 16 is threadedly inserted into the screw hole, and the tip of the rod-shaped portion 16 is inserted. is in contact with the upper wide part of the seal crimping ring 6, an O-ring 18 is attached to the lower end of the screw hole, a lock nut 19 is screwed to the part of the adjustment bolt 17 that protrudes from the upper surface of the valve cover C, and the upper end of the adjustment bolt 17 is attached. A chamfered portion 20 is formed on the surface.

Reference numeral 21 denotes a recess 22 whose stem is inserted into a hole bored in the center of the valve cover C and whose lower end is provided on the curved surface of the ball 11.
A gland packing 23 is attached to the insertion part of the hole in the valve cover C of the stem 21, and a center hole of the gland presser 24 is inserted into the center hole of the gland holder 24 in the middle part of the stem 21.
A gland presser sleeve 25 is interposed and fitted between the stem 21 and the valve cover C. The gland presser 24 is fastened to the valve cover C with bolts 25, and a handle 27 is attached to the upper end of the stem 21.

Its action will be explained below.

When the lock nut 19 is loosened and the lever fitted into the chamfered portion 20 is rotated to lower the adjustment bolt 17, the seal crimping ring 6 is pressed downward by the lower rod-shaped portion 16 of the adjustment bolt 17.

The seal support ring 5 and the seal crimp ring 6 are in contact with each other at their respective tapered surfaces, and the outer diameter of the seal crimp ring 6 is smaller than the outer diameter of the seal support ring 5. Since there is a gap between them, as the seal crimping ring 6 is pressed downward, the seal 7 is pressed to the left in the drawing via the retainer 8 and comes into pressure contact with the ball 11, and the ball 11 moves to close the valve chamber 1. It comes into close contact with the gasket 10 placed on the left side of.

Then, when the seal 7.10 reaches a certain sealable range of surface pressure against the ball 11, adjust the adjustment bolt 1.
Stop the lowering of 7 and tighten the lock nut to fix the adjustment bolt 17 to the valve cover C.

In this case, at the initial stage of valve assembly, apply sufficient tightening force with the adjustment bolt to obtain sealing surface pressure between the valve seat gasket and the ball, run the valve seat gasket and ball in a run-in operation, and then tighten the adjustment bolt. Adjust the appropriate seal surface pressure and secure with the lock nut.

In this invention, the closeness between the valve seat packing 7.10 and the ball 2 can be adjusted by operating the adjustment bolt from the outside of the ball valve. If fluid leaks from the gap, the adjustment bolt can be lowered to bring the valve seat gasket and ball into close contact to stop the fluid leakage, without the need to disassemble the valve or replace the valve seat gasket. I can do it.

In addition, rubber-like elastic bodies or plastics are used for the material of the valve seat packing, and the adjustment bolt can apply a sealing surface pressure suitable for the material of the valve seat packing, preventing excessive tightening. This prevents wear and tear on the valve seat gasket due to

[Brief explanation of the drawing]

Figure 1 is a front cross-sectional view of the ball valve according to the present invention, Figure 2
3 is an exploded perspective view of a packing support ring, a packing crimping ring, and an adjustment bolt, and FIG. 4 is a longitudinal sectional view of the center of a conventional ball valve. a...Valve body, b...Gap, C.
... Valve cover, 1... Valve chamber, 2...
...Fluid distribution cylinder, 3...Catch, 4...
... Packing fitting part, 5... Packing support ring,
6... Packing crimping ring, 7... Packing, 8... Retainer, 9... Reinforcement ring, 10... Packing, 11. ... Ball, 12 ... Support stand, 16 ... Rod-shaped part,
17... Adjustment bolt, 19...
Lock nut, 20... Chamfered part, 21...
... Stem, 22 ... Concavity, 23 ...
・Grand packing, 25...Grand presser foot,
26...Bolt, 27...Handle.

Claims (1)

[Scope of utility model registration request] It has a valve chamber 1 that is open at the top, and valve chambers 1 on both sides of the valve chamber 1.
The valve chamber 1 of the valve body a is provided with fluid flow tubes 2, 2 communicating with the valve body a, and the valve chamber 1 is provided with a seat 3 on the lower side of the negative side thereof, in which a packing support ring, a packing crimping ring, and a packing are juxtaposed.
A fitting part 4 for fitting a seal is provided at the lower part of the other side, and a circular seal support ring 5 with one side tapered is provided on the seat 3 provided at the lower part of one side of the valve chamber 1. is installed with its tapered surface facing toward the valve chamber 1 and its wide part facing downward, and the tapered surface of the seal support ring 5 has an outer diameter smaller than the outer diameter of the seal support ring 5. The tapered surface of the circular packing crimping ring 6, which has one side tapered to match the tapered surface of the packing support ring 5, is brought into contact with the tapered surface of the packing ring 6.
The seal crimping ring 6 is arranged with its wide part facing upward and a gap formed between the narrow part facing downward and the catch seat 3. Patsukin 7
The retainer 8 attached to the outer surface of the valve chamber 1 is brought into contact with the retainer 8, and the retainer 8 is installed on the seat 3, and the reinforcing ring 9 is attached to the outer surface of the fitting part 4 provided at the lower part of the other side of the valve chamber 1. A valve cover C is fixed to a support base 12 provided on the upper surface of the valve body a, and a hole is bored at a position corresponding to the seal crimping ring 6 of the valve cover C. An adjustment bolt 17 is screwed and inserted into the hole, and the rod-shaped part 16 formed at the lower end of the adjustment bolt 17 is brought into contact with the upper wide part of the seal crimping ring 6, and the ball 11 inserted into the valve chamber 1 from above is inserted around the rod-shaped part 16. A ball valve in which a packing 7 disposed on one side of the valve chamber 1 and a packing 10 disposed on the other side of the valve chamber 1 are in contact with the surfaces thereof.