JPS598059Y2 - Gate valve opening indication device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an opening degree indicating device that clearly indicates the opening degree of an embedded internally threaded gate valve.

As a conventional gate valve opening indicating device, for example,
As shown in Japanese Publication No. 20713 and Japanese Utility Model Publication No. 44-28365, the opening degree of the valve is displayed by transmitting the rotation of the valve stem to a pointer or scale via a gear mechanism. When these are applied to valves, the opening degree display device is installed near the operating part of the valve stem, so it is necessary to crawl into manholes etc. to check the opening degree.

The present invention was developed in view of the above points, and its purpose is to:
To provide an opening indicating device which allows the opening of a valve to be easily checked visually on the ground and which can be easily incorporated into an existing small-diameter gate valve.

In order to achieve this purpose, the present invention provides a gate valve in which a valve housing and a valve chamber containing a valve body and a valve stem are buried, and the valve stem of an internally threaded gate valve that protrudes upward from the valve body. A gear that rotates integrally with the above is provided on the upper part of the valve housing or the valve chamber in which the valve box and the valve stem are housed, and a collar is provided on the upper part of the valve housing or the valve chamber. A rotating cylinder held in the same support cylinder is suspended, and a feed gear that meshes with the gear of the valve stem is provided at the lower part of the support cylinder, and a feed pin is provided on the upper surface of the feed gear, and the lower end of the rotating cylinder is provided with teeth that engage with the feed pin, and the upper part of the rotating cylinder and the upper part of the support cylinder are provided with a pointer and a scale indicating the opening degree of the gate valve.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. A gear 3 is provided on the upper part of a valve stem 2 that projects upward from a valve body 1a of an internally threaded gate valve 1.

A valve chamber 4 containing a gate valve 1 and a valve stem 2 is already installed and buried.

A flange 5 is provided at the upper part of the valve chamber 4, and a circular support cylinder 6 is vertically provided from the flange 5 into the valve chamber 4.

A rotating cylinder 7 is rotatably supported within the support cylinder 6.

A feed gear 8 that meshes with the gear 3 is supported at the lower part of the support cylinder 6, and a feed pin 9 is provided protruding from the upper surface of the feed gear 8.

The lower end of the rotating cylinder 7 is provided with teeth that engage with the feed pin 9, and the upper end is provided with a pointer 11.

Further, an opening degree scale 12 is provided on the upper part of the support cylinder 6.

The gate valve 1 has a lid 1b through which a valve stem 2 passes through the upper part of the valve box 1a.
is tightened and sealed by flanges IC, ld, bolts 1e, and nuts 1f.

If the valve stem 2 is an existing gate valve, a fitting part 2b fitted to the upper end part 2a of the valve stem and a square head part 2C integrated with this fitting part.
The fitting portion 2b is fitted and fixed to the upper end portion 2a of the valve stem, and the cylindrical gear 3 is fitted and fixed to the fitting portion 2b.

However, in the case of a new installation, the valve stem 2 is extended and a portion corresponding to the square head 2C described above is provided at the upper part, and a gear 3 is also provided.

The flange portion 5 of the valve chamber 4 has a step portion 5a and a cylindrical portion 5b below the step portion 5a that fits into the upper part of the valve chamber 4. The step portion 5a is supported from below and the cylindrical portion 5b supports the valve. Although the flange 5 is shown fitted in the upper part of the chamber, the flange 5 may be provided integrally with the valve chamber 4.

The circular support cylinder 6 engages with the stepped portion 5a of the flange 5 through a flange 6a provided at its upper end, hangs down from the flange into the valve chamber 4, and its lower end reaches the position of the lid 1b of the gate valve 1. A suitable number of flanges 6b, 6C, 6d are provided on the inner periphery of the support cylinder 6, and an inward protrusion 6e is provided at the bottom, and the shaft 8a of the feed gear 8 is connected to the protrusion 6e. 8b, and the feed gear 8 is meshed with the gear 3.

The rotating cylinder 7 is inserted into the supporting cylinder 6, and is engaged with the uppermost flange 6b on the inner circumference of the supporting cylinder by means of a flange 7a provided at the upper part of the rotating cylinder, and the middle and lower flanges 6C, 6
d serves as a steady rest, and teeth 10 are provided at the lower end of the rotating cylinder 7 over a predetermined angular range (approximately 10° to 35°).

As described above, the feed gear 8 is supported by the shaft 8a and meshes with the gear 3, and also engages with the teeth 10 of the rotating cylinder 7 through the feed pin 9 provided on the upper surface, and one rotation of the feed gear 8 causes the rotating cylinder 7 to rotates by one tooth.

The pointer 11 is shown in the upper part of the rotary cylinder 7, and the opening scale 12 is installed in the upper inner periphery of the support cylinder 6. may be provided.

Like the teeth 10, the opening scale 12 is provided over a predetermined angle range (approximately 10° to 350'), and the pointer 11 points to the zero point of the opening scale 12 when the gate valve is closed, and when the valve stem 2 It is assumed that as the valve opening increases as the valve rotates, the scale indicated by the pointer increases.

For example, when targeting a water flow pipe with a diameter of 100 mm, the number of valve stem rotations is 16 times, the ratio of the number of teeth between gear 3 and gear 8 is 1.6:l, and the rotation angle of rotating cylinder 7 is approximately 10°, and the angular range of the opening degree scale 12 may be set to approximately 260°.

With the above-described structure, when opening the gate valve 1, the handle is fitted into the square head 2C provided on the upper part of the valve stem 2, and the gears 3 and 8 rotate at the same time as the handle is rotated. The tooth 10 of the rotary cylinder 7 is advanced by one tooth by the feed pin 9, and the rotary cylinder 7 rotates by one tooth, and the pointer 11 points to the opening degree scale 12 by the amount of rotation, indicating the opening degree of the valve. By reading this scale, the opening degree of the valve can be easily confirmed.

Although the above embodiments have been explained using a valve chamber, implementation using a valve case is also possible.

As described above, the present invention provides a flange on the upper part of the valve housing or valve chamber, a circular support cylinder is suspended from the flange into the valve body or the valve chamber, and a rotating cylinder is placed inside the support cylinder. A feed dog is provided in the lower part of the support tube to mesh with a gear provided on the upper part of the valve stem of the gate valve, and a feed pin protruding from the top surface of the feed gear meshes with the shaped teeth on the lower end of the rotating cylinder. The rotary cylinder is rotated in conjunction with the rotation of the valve stem, and the amount of movement of the pointer provided on the top of the rotary cylinder is confirmed by the scale provided on the top of the support cylinder, so even in a buried gate valve, Valve opening can be easily checked on the ground.

A gear is attached to the valve stem, a flange is provided on the upper part of the valve casing or the valve chamber, a supporting cylinder is hung from the flange, a rotating cylinder is supported by this, and this rotating cylinder is attached to the valve stem. Since the opening degree is displayed by rotating the provided gear, it is of course easy to implement on newly installed gate valves, and can be easily installed on existing buried type gate valves without any special modification work. It can be easily incorporated and implemented, and its function is that the opening degree of the gate valve can be easily checked using the pointer and scale as described above, so it has high utility value and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a cross-sectional view taken along line II--III in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III--III in FIG. 1 is a gate valve, 2 is a valve stem, 3 is a gear, 4 is a valve chamber, 5 is a flange, 6 is a circular support cylinder, 7 is a rotating cylinder, 8 is a feed gear, 9
10 is a feed pin, 10 is a tooth, 11 is a pointer, and 12 is an opening degree scale.

Claims (1)

[Scope of utility model registration request] In a gate valve in which a valve housing containing a valve body and a valve stem or a valve chamber is buried, a gear is provided on the upper part of the valve stem of an internally threaded gate valve that protrudes upward from the valve body so as to rotate together with the valve stem. , a flange is provided on the upper part of the valve casing or the valve chamber, a circular support cylinder is suspended from the flange into the valve casing or the valve chamber, and a rotating cylinder held within the support cylinder is suspended; A feed gear that meshes with the gear of the valve stem is provided at the lower part of the support cylinder, a feed pin is provided on the upper surface of the feed gear, and teeth that engage with the feed pin are provided at the lower end of the rotary cylinder. A gate valve opening indicating device characterized in that a pointer and a scale indicating the opening of the gate valve are provided on the upper part and the upper part of the support cylinder.