JPH0315885Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a trunnion-mounted ball valve equipped with a ball seat held by a seat retainer. This invention relates to an improvement in the built-in structure of a compression spring that is pressed with a force of .

(Prior Art) Conventionally, as a means for assembling the above-mentioned spring into the body, as shown in FIG.
or as shown in Figure 5,
Measures are taken such as drilling a hole in the body or body cap 4 and storing a compression spring 6 in the hole 5.

(Problem to be solved by the invention) However, the above means requires drilling a hole for holding the spring on either side of the seat retainer 1 or the body (or body cap) 4.
This processing work is extremely troublesome work since it is applied to the seat retainer and the body, and is an uneconomical work that requires time and effort.

The present invention is an attempt to solve the above-mentioned problems in that the machining and assembly work of the conventional structure is extremely troublesome, has low work efficiency, and lacks economic efficiency.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a rotatable ball having a through hole in a valve body, and a seat retainer is provided between the body and the ball. , in a ball valve in which a ball seat that is in sealing contact with the surface of the ball is attached to the seat retainer, an annular space is formed between a stepped portion formed on the inner peripheral surface of the body and a stepped portion formed on the outer peripheral surface of the seat retainer. An annular holding member having a thin U-shaped cross section is inserted into the space, insertion holes for inserting compression springs are formed at equal intervals on the annular side surface of the holding member, and holes are formed on the outer periphery of each insertion hole. adopted a structure in which a holding cylinder is formed to protrude inwardly from the holding member in parallel with the inner and outer surfaces of the holding member, and the compression springs inserted into each insertion hole are held in the holding cylinder.

(Function) Since the ball valve of the present invention is configured as described above, there is no need to form a hole in the body or seat retainer to accommodate the compression spring.
Easy to process.

Furthermore, when assembling the valve, first the compression spring is held in the holding cylinder of the insertion holes provided at equal intervals in the annular holding member, and this holding member is fitted into the step part of the seat retainer, and the seat retainer in this state is By inserting the compression spring into the stepped portion of the body, the compression spring can be assembled together with the seat retainer very easily.

The compression spring assembled in this manner can cause the seat retainer to spring toward the ball side in the assembled ball valve.

(Example) Examples of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a partially enlarged view of the same, FIG. 3A is a partial side view of the holding member of the same, and FIG. 3B is an e-
It is an e-line sectional view.

In the drawings, reference numeral 11 denotes the body of the ball valve, and the body 11 is composed of a body portion 11a and a cap 11b. A ball 14 having a through hole 13 is rotatably mounted at the center of the body 11 via a lower trunnion shaft 12a and an upper trunnion shaft 12b.

15 is an annular seat retainer provided on both sides of the ball 14, and 15a is a metal touch portion formed on the ball 14 side of the seat retainer 15.

The seat retainer 15 has a stepped portion 16 formed on the outer periphery opposite to the ball 14 side.
is constituted by a parallel surface 16a parallel to the flow path direction and a vertical surface 16b perpendicular to the flow path direction. Furthermore, an elastic ball seat 17 is attached to the ball 14 side of the seat retainer 15, and this ball seat 1
7 is brought into sealing contact with the ball surfaces 14a on the primary and secondary sides to maintain airtightness.

18 is a step formed on the inner peripheral surface of the body 11;
This stepped portion 18 has a parallel surface 18a parallel to the flow path direction.
and a vertical surface 18b perpendicular to the flow path direction.

Reference numeral 19 denotes an annular space formed by the stepped surface 16 of the seat retainer 15 and the stepped portion 18 of the body 11. In this space 19, one end is connected to a stepped portion 1.
The other end is attached to the vertical surface 16b of the stepped portion 18 on the vertical surface 16b of the stepped portion 18.
A plurality of compression springs 20 are mounted in contact with b.

This compression spring 20 is inserted into insertion holes 22f provided at equal intervals on the side surface of an annular holding member 21 having a thin U-shaped cross section and mounted in the space 19. The compression spring 20 is held by a holding cylinder 22d that is formed protruding from the outer peripheral edge of the insertion hole 22f in parallel with the inner and outer circumferential surfaces of the holding member 21. Figure 3A and e- above.
FIG. 3B, which shows a cross section of E, shows a holding member 21 having a thin U-shaped cross section and an appropriate number of holding cylinders 22 as holding parts.
d are formed at equal intervals.

Next, the operation of the above embodiment will be explained.

First, to show an example of the work of assembling the ball valve in the embodiment shown above, first, the compression springs 20 are inserted into the insertion holes 22f provided at equal intervals in the annular holding member 21, and held in the middle by the holding cylinder 22d. and then attach this holding member 21 to the seat retainer 15.
When the seat retainer 15 in this state is inserted into the stepped portion 18 of the body portion 11,
Step portion 16 and body portion 11 of seat retainer 15
Since a space 19 is formed with the step 18 of a,
The compression spring 20 held by the holding member 21 is inserted into the space 19, and one end of the spring 20 is in contact with the parallel surface 16a of the stepped portion 16, and the other end is in contact with the parallel surface 18a of the stepped portion 18. Then, the seat retainer 15 is pressed toward the ball 14 side.

Next, the ball 14 is attached to the trunnion shafts 12a, 12.
The cap 11b is rotatably mounted in the body 11 via the cap 11b, and the seat retainer 15 is mounted via the compression spring 20 held by the holding member 21 on the stepped portion 18 of the body cap 11b in the same manner as described above.
It is assembled by being fixed to the body portion 11a via bolts 26.

In the assembled state as described above, the seat retainer 15 is pressed in the direction of the balls 14 by the force of the compression spring 20, the fluid pressure acting on the seat retainer 15, or the resultant or differential force of the two.
Ball seat 17 attached to seat retainer 15
is in sealing contact with the ball surface 14a. If the fluid pressure accumulated in the body cavity rises and exceeds the line pressure, the seat retainer 15 will move slightly backward against the compression spring 20 to the side opposite to the ball surface 14a, reducing the pressure in the cavity to the pipe. It works to bring it back inside the line.

Effects of the Idea As is clear from the above, the compression spring held by the holding cylinder of the annular holding member with a thin U-shaped cross section is placed in the space formed by the stepped part of the seat retainer and the stepped part of the body. By charging,
There is no need to drill numerous holes in the seat retainer or body, and assembly is easy.
Work efficiency is significantly improved compared to conventional work,
Furthermore, the holding member can be made lightweight regardless of the size of the inner diameter of the space, and the outer diameter of the compression spring can be adjusted by adjusting the outer diameter of the compression spring to the diameter of the space. A holding member that can be applied to various ball valves can be mass-produced at low cost simply by matching the diameter of the hole.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view of the ball valve according to the present invention, FIG. 2 is a partially cutaway enlarged cross-sectional view of FIG. 1,
FIG. 3A is a partial side view showing an example of the holding member according to the present invention, FIG. 3B is a sectional view taken along line ee-e of the same, and FIG. 4 is a conventional sheet provided between the body and the ball. FIG. 5 is a partial sectional view showing an example of the retainer portion, and FIG. 5 is a partial sectional view showing another example of the same portion. 11... Body, 13... Through hole, 14... Ball, 14a... Ball surface, 15... Seat retainer, 16... Step portion, 17... Ball seat, 18... Step portion, 19... Space part, 20... compression spring, 21... holding member, 22d... holding cylinder,
22f...Insertion hole.

Claims (1)

[Scope of utility model registration request] A ball valve in which a ball having a through hole is rotatably provided in a valve body, a seat retainer is provided between the body and the ball, and a ball seat is attached to the seat retainer in sealing contact with the surface of the ball. A step formed on the inner peripheral surface of the body and a step formed on the outer peripheral surface of the seat retainer form an annular space, and an annular holding member having a thin U-shaped cross section is inserted into the space. , insertion holes for inserting compression springs are formed at equal intervals on the annular side surface of the holding member, and a holding cylinder is provided on the outer periphery of each insertion hole in parallel with the inner and outer surfaces of the holding member. A ball valve characterized in that a compression spring formed in a protruding manner and inserted into each insertion hole is held in the holding cylinder.