JPH0247327Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a swing-type check valve having a swing-type valve body that swings and seats on a valve seat provided in a valve box.

[Prior Art] Various types of such swing type check valves are known. However, in the prior art, it is relatively difficult to know from the outside whether the check valve is open or closed. In other words, it is possible to provide the valve body and valve stem integrally and visually observe the angular position of the valve stem, but if the valve body and valve stem are integrated in advance, it is difficult to incorporate the valve body into the valve box. Moreover, it is troublesome to assemble separate parts and then integrate them into one body after assembly. Further, in order to prevent liquid leakage, a seal such as an O-ring must be used, and frictional force impairs smooth operation of the valve body.

It is known to use proximity switches to detect the position of working parts. However, when attempting to detect the position of the valve body of a check valve using a proximity switch, the operating range of the proximity switch differs depending on the proximity switch, so the valve body remains in the closed state (no water supply state). Even if you try to detect it, it will be judged as closed even if it is slightly open.

[Object of the invention] Therefore, an object of the invention is to provide a swing type check valve that can accurately detect the closed state even when a proximity switch is used.

[Structure of the invention] According to the invention, in a swing type check valve having a swing type valve body that swings and seats on a valve seat provided in a valve box, A proximity switch is attached to the valve box through a shim at a position almost perpendicular to the swinging direction, a sensing part of the proximity switch is provided on the valve body, and the valve body is bushed through gaskets that function as bearings at both ends of the valve stem. It is held between.

[Operation and effect of the invention] Therefore, when the sensing part provided on the valve body is in the valve closing position during the locus that the sensing part provided on the valve body moves as the valve body opens and closes, the proximity switch moves the sensing part. All you have to do is adjust the shim to a position where it can be detected. Since the proximity switch is installed in a direction perpendicular to the swinging direction of the valve body, the trajectory of the valve body can be calculated relatively easily, and the proximity switch can be installed in the appropriate position by adjusting the thickness of the shim. can.

In addition, since both ends of the valve stem are held between bushes via gaskets, the mounting parts for attaching the valve body to the valve stem can be attached to the bushes on both sides with a gap depending on the thickness of the gasket. By giving the gasket the function of a bearing, smooth operation can be achieved.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In Fig. 1 and Fig. 2, the valve body 1 is the inlet port 2.
A valve seat 4 is provided inside the valve seat 4, and a valve body 6 of a valve V is swingably attached to the valve stem 5. In the illustrated example, the valve body 6 is fixed to a valve main body 7 by a bolt B, and the valve main body 7 has an arm portion, that is, a mounting portion 8 for attaching to the valve stem 5. Both ends 5a, 5b of the valve stem 5, which pivotally supports the mounting portion 8, are held by bushes 9a, 9b inserted into the valve body 1 from both sides.
The bushes 9a, 9b are O-rings 10a, 1
The gap is sealed by 0b. Furthermore, the outer ends of the center holes 11a, 11b of the bushes 9a, 9b holding the valve stem 5 are plugs 12a, 12b.
is closed by. Each bush 9a, 9b
and the bush 9 of the mounting part 8 of the valve main body part 7.
Gaskets 13a and 13b, which function as bearings, are inserted into the engaging surfaces of the gaskets 13a and 9b.
The thickness of the gaskets 13a, 13b is preferably about 0.2 to 0.3 mm thinner than the length δ between the inner end of the bush and the engagement surface of the mounting portion 8. With this configuration, the movement of the valve body 6 can be made smooth.

As can be seen from FIG. 2, the proximity switch 20 is provided in a direction perpendicular to the direction in which the valve body 6 swings. However, in FIG. 1, it is shown in phantom lines at a position shifted by 90 degrees. In the space 21 formed in the valve box 1,
A sensor cap 22 of the proximity switch 20 is inserted, and the sensor cap 22 is sealed with a wall 23 defining a space 21 by an O-ring 24. A bolt 26 and a proximity switch are fixed to the valve box 1 using a mounting cover 25.
A shim 27 is interposed on the mounting surface of the mounting cover 25, and by adjusting the thickness of the shim 27, the distance between the axis O of the check valve and the engagement surface of the mounting cover 25 can be changed. As a result, the position of the sensor cap 22 can be changed.

In particular, as clearly shown in FIGS. 3 and 4, the valve main body 7 has a sensing section S of the proximity switch 20.
is installed. When the lower end point Z of the sensing portion S reaches the valve closed position, the position of the proximity switch 20 may be adjusted using the shim 27 so that the operating area A of the proximity switch 20 exactly coincides with the position.

Therefore, when the valve body 6 is closed, the proximity switch 20 detects the sensitive part S and outputs the signal from the wire W, so that it can be confirmed that the valve is closed.

[Summary] As described above, according to the present invention, the proximity switch cannot detect the sensing part in the valve open position and outputs a signal only in the valve closed position, so that the valve closed state can be reliably detected. Moreover, the valve body can operate smoothly.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of a check valve implementing the present invention.
2 is a sectional view taken along line X--X in FIG. 1, FIG. 3 is a side view of the valve implemented in the present invention, and FIG. 4 is a plan view of FIG. 3. 1... Valve box, 4... Valve seat, 5... Valve stem, 6...
Valve body, 20...proximity switch, 9a, 9b...button, 13a, 13b...gasket, S...
Sensing part.

Claims (1)

[Scope of utility model registration request] In a swing type check valve having a swing type valve body that swings and seats on a valve seat provided in a valve box,
A proximity switch is attached to the valve box via shims at a position almost perpendicular to the swinging direction near the valve seat where the valve body sits, a sensing part of the proximity switch is provided on the valve body, and the valve body is attached to both ends of the valve stem. A swing type check valve characterized in that it is held between bushings via a gasket that functions as a bearing.