JPS5826483B2 - External pressure operated water supply bypass switching valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve system that uses normal air pressure as a power source for switching operations of a water supply heat line and a bypass line.

In this type of valve device, when a portion of the water supply is used to open and close the valve, since it is high-pressure water, there is no wasted time in control, and there is an advantage that the opening and closing operation can be performed quickly. The control circuit for this is somewhat complicated, and since the switching pilot valve handles fluid with a high differential pressure, the seat part is easily damaged.

Therefore, in the present invention, in order to prevent the above-mentioned drawbacks, an external pressure-operated water supply bypass switching valve is used, the control circuit is simplified with only a low-pressure air line, and a small-capacity cylinder actuator and an actuating lever are combined to improve control accuracy. improvement of
Its purpose is to speed up opening and closing operations.

The configuration of the device of the present invention will be explained with reference to the drawings. A large mouth valve 1 having flow passages in three directions and an outlet valve 2 having flow passages in three directions are provided, and the inner chambers of both valves 1.2 are The inlet valve 1 has a water supply port 1a from a water supply pump (not shown) that opens into the inner chamber, a bypass port 1b connected to the bypass flow path 3, and the valve is separated from the inner chamber. and open the water supply heater ports 1c at the bottom, and the outlet valve 2.
A bypass port 2 from the bypass flow path 3 is connected to the inner chamber.
b, and a boiler port 2a that opens laterally from the inner chamber, and a water heater port 2a is provided at the bottom, roughly separated from the inner chamber by a valve.
The water heater ports 1c and 2c of both valves 1 and 2 are respectively connected to a high pressure water heater 4.

From the liquid level gauge 5 attached to the water supply heater 4, a valve rod 11 that slides vertically in the inner chambers of both valves 1 and 2, as will be described in detail later.
A four-way solenoid valve 6 that switches the supply air to an air cylinder 8 that drives the air cylinder 8 is provided with wiring 7 that constitutes a control circuit.

However, the inner chamber of the large mouth valve 1 has upper and lower valve seat surfaces, and when the upper valve seat surface is closed with the valve body 13 provided in the middle,
When the water supply port 1a and the water heater port 1c communicate with each other and the valve body 13 closes the lower valve seat surface, the water supply port 1a and the bypass port 1b communicate with each other, and the inner chamber of the exit valve 2 is provided with only a valve seat for opening and closing the feed water heater port 2c, and if the valve body 13 closes the feed water heater port 2c, only the bypass passage 8 and the boiler port 2a communicate with each other, and if the feed water heater port 2c is opened, Water from the feed water heater 4 is supplied to a boiler (not shown) through a boiler port 2a.

However, each valve body 13 provided in the inner chamber of the artificial valve 1 and the outlet valve 2 needs to maintain the flexibility of the valve seat surface that contacts the respective valve seat, so each valve body 13 has a space on the circumferential surface of the valve body. The grooves are designed to absorb shock upon contact and improve airtightness.

The air cylinder 8 attached to both the valves 1 and 2 is equipped with a piston like a tilted arm, and the actuating lever 10 interlocked with the piston has its end as a fulcrum i0a and is mounted on the axis of the valve stem 11. The operating point 10b is pivotally connected with an arbitrary pin, etc.
Both cylinders 8 are provided with an air supply passage 14 that opens above and below the piston, and an air pressure reducing valve 16 is provided at a suitable location between the supply passage 14 and the air source 15. Four-way solenoid valves 6 forming a circuit are installed at the branch actuating portions of the upper and lower air supply paths 14 of the air cylinder 8, respectively, and are provided to control the selection thereof, and further,
A cylinder bypass valve 9 is attached to an air supply path 14 that branches above and below the air cylinder 8, and by opening and closing the cylinder bypass valve 9, pressurization inside the cylinder is released.

The present invention is characterized by operating an external pressure-operated water supply bypass switching valve, in which the operation of the four-way solenoid valve 6 is switched in response to a signal from the liquid level gauge 5, and the air pressure is is applied, and at the same time the air pressure at the bottom of the piston escapes, the cylinder 8 moves to the operating point 1b of the operating lever 10.
The valve rod 11 that connects the valve rod 11 is lowered, and the valve body 13 at the bottom opens the bypass eye 1b side of the inlet valve 1, and the
The c side is closed, and the flow direction of the supplied water is changed to the bypass flow path 3.

The vertical opening/closing of the valve body 13 of both valves 1 and 2 is performed by converting the pressurizing path of the air supply to the air cylinder 8, and the control requires only a low-pressure air line, simplifying the system and improving control accuracy. This made it possible to speed up the opening and closing operations.

[Brief explanation of the drawing]

The drawing is a layout side view showing an embodiment of the invention. Explanation of symbols, 1...Inlet valve, 2110. ... Outlet valve, 1a ... Water supply port, 2a ... Boiler port, 1b ... Bypass port, 2b ...
・Bypass port, 1c...Water supply heater port, 2c・
... Water supply heater, 3 ... Bypass flow path, 4 ... Water supply heater, 5 ... Liquid level gauge,
6...Four-way solenoid valve, 7...Wiring, 8...
... Air cylinder, 9 ... Cylinder bypass valve, 10 ... Actuation lever 11 ...
Valve stem, 12... ring, 13... valve body,
14...Air supply path, 15...Air source, 16...Air pressure reducing valve.

Claims (1)

[Claims] 1. From each inner chamber of an inlet valve and an outlet valve having flow paths on three sides,
An opening is provided in the flow path to the high-pressure water supply heater and the bypass flow path, and the flow path is opened and closed by a valve body housed in the inner chamber, and an air supply path to the air cylinder that opens and closes the valve body is provided. An external pressure-operated water supply bypass switching valve device, characterized in that a four-way solenoid valve is installed, and a control circuit from a liquid level gauge attached to the high-pressure water heater is configured therein. 2. The external pressure-operated water supply bypass according to claim 1, wherein a four-way solenoid valve comprising a water level gauge and a control circuit of the water heater is installed in a branch operating section of an air supply path connected to the upper and lower parts of the air cylinder. Switching valve device.