JPH0669550U - Valve operation confirmation device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the space for valve drive and electrical work. [Structure] The air pressure from an air source passing through an air pressure switching valve 3 which is moved by opening and closing of a valve drive unit 2 acts on a pressure switch 4 installed at a remote location from the valve body 1, and the pressure switch 4 receives a constant air pressure. An electric signal 7 indicating that the valve body 1 is open or closed is output according to whether or not the pressure value is equal to or higher than the pressure value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to automatic operation or remote operation of a valve in various industrial fields, and more particularly to a valve operation confirmation device for confirming a valve opening / closing operation in a remote place.

[0002]

[Prior art]

 Conventionally, this type of valve operation confirmation device has been configured to confirm the open / closed state of a valve by directly sending it as an electric output signal from an electric limit switch that is linked with the opening / closing operation of the valve.

[0003]

[Problems to be solved by the device]

 In the conventional valve operation confirmation device described above, especially in the case of pneumatically driven valves that are widely used, many accessories such as solenoid valves, air regulators and electric limit switches are attached to the valve body, so the valve drive part Not only is it bulky and requires a large space for installation, but the pneumatic piping for valve drive and signal wiring from the electric limit switch are complicated around the valve, and there are two types of electrical work and piping work for these. However, there is a drawback that the construction materials such as equipments and conduits are expensive when the construction is required, especially when the electric appliances need explosion-proof type.

An object of the present invention is to provide a valve operation confirmation device that does not require electrical work around the valve and therefore does not require expensive explosion-proof electrical equipment.

[0005]

[Means for Solving the Problems]

 The device for confirming valve operation according to the present invention is mounted on a drive part of a valve, and is operated in conjunction with the opening and closing of the valve to open and close, and an air pressure switching valve for switching a pressure value of air supplied from an air pressure source; When the pressure value of the air supplied from the air pressure switching valve connected to the switching valve is a certain value or more, a signal indicating that the valve is open or closed is output, and the pressure value is A pressure switch for outputting a signal indicating that the valve is closed or open when the pressure is lower than a certain pressure.

The valve may be an air pressure drive type, and the air supplied to the air pressure switching valve may be supplied from an air pressure source for driving the valve through a throttle valve.

[0007]

[Action]

 Since the pressure switch outputs a signal indicating whether the valve is open or closed, installing the pressure switch at a location remote from the valve and piping between it and the air pressure switching valve eliminates the need for electrical wiring around the valve. There is no complication between signal wiring and piping, and there is no need for electrical work, which simplifies the work and eliminates the need for explosion-proof electrical equipment.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration block diagram of a first embodiment of a valve operation confirmation device of the present invention.

In FIG. 1, this valve operation confirmation device is composed of a valve body 1, an air pressure switching valve 3 added to a valve drive unit 2, a pipe 5, and a pressure switch 4.

The air pressure switching valve 3 receives air pressure through a pipe 5 for supplying air pressure from an air pressure source. Further, the pneumatic switching valve 3 has a lever 6 that is moved by the operation of the valve drive unit 2, and the operation of the lever 6 interlocks with the opening / closing operation of the valve body 1 to open and close its own valve. The pressure switch 4 is installed at a place away from the valve body 1 and is connected by a pipe 5 so as to receive the output air pressure of the air pressure switching valve 3 and detects whether the received air pressure is a certain value or more. Then, it outputs as an electric signal 7 indicating the opening or closing operation of the valve body 1 corresponding to the detected air pressure.

In the valve operation confirmation apparatus of the present embodiment, if the pressure switch is installed at a place distant from the valve, no electric wiring is required around the valve drive section, and there is no complication between the electric wire and the valve drive air pipe. Construction is easy and there is no need for explosion-proof electrical equipment.

FIG. 2 is a configuration block diagram of a second embodiment of the valve operation confirmation device of the present invention.

In FIG. 2, this valve operation confirmation device shows a case where the valve drive unit 2 is of a pneumatic drive type, and the drive air pressure is supplied from an air source through a valve drive solenoid valve 9 through a pipe 10 to a valve drive unit. 2, the air pressure switching valve 3 receives air pressure through a throttle valve 8 attached to a pipe branched from the pipe 10.

The air pressure switching valve 3 has a lever 6 that is moved by the operation of the valve drive unit 2. The operation of the lever opens and closes its own valve in conjunction with the opening and closing operation of the valve body 1.

The throttle valve 8 is preset with an appropriate throttle degree.

As in the case of FIG. 1, the pressure switch 4 outputs an opening or closing operation of the valve body 1 as an electric signal 7.

In the valve operation confirmation device of the present embodiment, if the pressure switch is placed as a solenoid valve for driving the valve and installed in a place away from the valve, electric wiring is not required around the valve drive section, and the electric wire and the valve are not necessary. The same effects as those of the first embodiment can be obtained, such as the fact that the construction does not become complicated with the drive air piping and the construction is simple.

[0019]

[Effect of device]

 As described above, according to the present invention, by transmitting a signal indicating the opening / closing operation of the valve by the air pressure switching valve and the pressure switch, the pressure switch can be installed at a location remote from the valve, including the solenoid valve for driving the valve if necessary. By doing so, there is no need for electrical wiring around the valve drive section, there is no complication between the electric wires and the valve drive air piping, and the work is simple, and there is no need for expensive explosion-proof electrical equipment that accompanies electrical wiring work. This has the effect of significantly reducing equipment costs.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a first embodiment of a valve operation confirmation device of the present invention.

FIG. 2 is a configuration block diagram of a second embodiment of the valve operation confirmation device of the present invention.

[Explanation of symbols]

 1 Valve body 2 Valve drive part 3 Air pressure switching valve 4 Pressure switch 5 Piping 6 Lever 7 Electric signal 8 Throttle valve 9 Solenoid valve 10 Piping

Claims (2)

[Scope of utility model registration request] 1. A valve operation confirmation device for confirming the opening / closing operation of a valve at a remote location, the valve operation confirmation device being attached to a drive part of the valve, opened / closed in conjunction with opening / closing of the valve, and supplied from an air pressure source. Connected to the air valve switching valve for switching the pressure value of the air to be supplied, and when the pressure value of the air supplied from the air pressure switching valve is a certain pressure or more, the valve is opened. Or a pressure switch that outputs a signal indicating that the valve is closed and outputs a signal indicating that the valve is closed or open when the pressure value is lower than a constant pressure. 2. The valve is a pneumatic drive system, and the air supplied to the pneumatic switching valve is supplied from an air pressure source for driving the valve through a throttle valve. Valve operation confirmation device.