JPH0320632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drain valve that opens a sub-valve after a main valve is completely closed to drain water from a secondary pipe.

(Prior art and its problems) In cold regions, drain valves are installed to prevent water pipes from bursting due to freezing, and when the water supply is not in use, such as at night, the main valve is closed to drain water from the main pipe. At the same time, the secondary valve is opened to drain water from the secondary piping between the drain valve and the faucet. However, with conventional water drain valves, the sub-valve opens before the main valve is completely closed, and water from the main pipe is temporarily discharged through the sub-valve while the valve is in operation.
So-called intermediate emissions were occurring. In order to prevent this intermediate discharge, a flat plate valve body is provided at the tip of the valve stem via a spring, and after the main valve is closed by the valve body, the valve stem is displaced by further compressing the spring. Some models are designed to open a sub-valve, but since the water pressure changes depending on various conditions such as the installation location and usage time, the water pressure and spring strength do not necessarily match, making it difficult to obtain the desired effect. It was hot. In addition, this type of configuration also had problems such as a short lifespan of the gasket.

(Object of the Invention) The present invention was made to solve the above-mentioned conventional problems.The sub valve opens after the main valve is completely closed, and the main valve opens after the sub valve is completely closed. To provide a drain valve that opens and has no intermediate discharge.

(Structure of the invention) It has a primary side passageway connected to the primary side piping and a secondary side passageway connected to the secondary side piping, and a ball valve body is installed between the primary side passageway and the secondary side passageway via a valve seat. The ball valve body includes a valve body that rotates the ball valve body, and a sub-valve body that communicates with the secondary side passage. A sub-valve rod is connected to the valve. The auxiliary valve stem is mounted within the auxiliary valve box and has an eccentric protrusion that engages with play a auxiliary valve body also provided within the auxiliary valve box. The secondary valve element closes the secondary valve by a biasing spring when the ball valve element is located in a state where the primary side passage and the secondary side passage are electrically connected,
When closing the main valve, the ball valve body rotates, completely blocking the primary and secondary passages, and then the protrusion of the auxiliary valve stem resists the biasing spring. Displace the sub-valve body, open the sub-valve, and drain the water in the secondary piping. When opening the main valve, the protruding portion retreats and the biasing spring moves the sub-valve to close the sub-valve, and then the ball valve rotates to open the main valve.

Hereinafter, embodiments will be described in detail with reference to the drawings.

(Example) FIG. 1 shows an example of the present invention.
1 is an outer box, and 2 is a valve box including a valve seat holder 2a, and has a primary side passage 3a connected to the primary side piping and a secondary side passage 3b connected to the secondary side piping. 4 is a valve seat 5a, 5 between the primary side passage 3a and the secondary side passage 3b.
A ball valve body rotatably mounted via b,
It has a through hole 4a in the center. 6 is the ball valve body 4
A valve rod 7 connected to one end and used to rotate the ball valve body is connected to a sub-valve box 9 provided at the lower part of the valve box 2 and communicated with the secondary passage 3b through a communication hole 8.
is installed in the sub-valve box 7, and one end is connected to the ball valve body 4.
As shown in FIG. 2, the other end has a protrusion 10 eccentric to its axis and a water passage hole 11. 12
is a sub-valve body that is slidably mounted in the sub-valve box 7 and engages with the protrusion 10 of the sub-valve stem with play;
It has the shape shown in the figure. When the sub-valve body 12 is not in contact with the protrusion 10, the sub-valve body 12 is closed by the biasing force of the spring 13 inserted between the sub-valve lid 7a (see Fig. 4) which forms a part of the sub-valve box. The valve is being pushed toward closing. 14 is a valve gasket, 15 is a check valve ball, 16 is a discharge port, and 17 is a plug.

Next, the operation of this embodiment will be explained. First, when the through hole 4a of the ball valve body 4 is aligned with the primary passage 3a and the secondary passage 3b as shown in FIG. Therefore, the auxiliary valve is closed by the biasing force of the spring 13. Next, when closing the main valve, use the valve stem 6.
As a result, the ball valve body 4 is rotated, and the through hole 4a is gradually displaced from the primary and secondary passages 3a, 3b, and at the same time, the auxiliary valve rod 9 is also rotated.
When the ball valve body 4 rotates further and the through hole 4a is completely removed from the passages 3a and 3b, water from the primary side piping is cut off, but at this rotation angle of the ball valve body, the sub valve rod 9 The protrusion 10 is not yet in contact with the sub-valve body 12, and therefore the sub-valve is not open. Next, when the ball valve body 4 is further rotated, the protrusion 1
0 contacts the sub-valve body 12 and pushes and displaces the sub-valve body against the biasing force of the spring 13, so the sub-valve opens and the water in the secondary piping flows through the communication hole 8, the conduction hole 11 and It is discharged to the outside from the drain port 16 through the sub-valve. It is easy to understand that when opening the main valve, the ball valve body 4 rotates in the opposite direction, so first the auxiliary valve closes and then the main valve opens.

(Effects of the Invention) As explained above, according to the present invention, when closing the main valve, the auxiliary valve opens after the main valve is completely closed, and when opening the main valve, the auxiliary valve opens after the main valve is completely closed. Since the main valve opens after closing, no intermediate discharge occurs. In the past, water resources were often wasted due to half-hearted tightening, such as electric opening/closing, but the present invention has the advantage of eliminating such waste.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a configuration diagram of the auxiliary valve stem, FIG. 3 is a configuration diagram of the auxiliary valve body, and FIG. 4 is a configuration diagram of the auxiliary valve cover. FIG. 1...Outer box, 2...Valve box, 3a...Primary side passage, 3b
...Secondary side passage, 4...Ball valve body, 4a...Through hole,
5a, 5b...valve seat, 6...valve stem, 7...subvalve box, 8...
Communication hole, 9... Sub-valve rod, 10... Protrusion, 12... Sub-valve body, 13... Spring, 14... Valve gasket, 15
...Check valve ball, 16...Discharge port.

Claims (1)

[Claims] 1. A valve box having a primary side passage connected to the primary side piping and a secondary side passage connected to the secondary side piping, and a valve box having a through hole in the center and a valve seat between the primary side passage and the secondary side passage. a ball valve body which is rotatably mounted on the body and connects or shuts off the primary passage and the secondary passage depending on the direction of the through hole; and a ball valve body which is connected to one end of the ball valve body and rotates the ball valve body. a valve stem that communicates with the secondary side passage; a sub-valve box that is rotatably mounted in the sub-valve box and has one end connected to the other end of the ball valve body to allow rotation of the ball valve body; a sub-valve rod that rotates with the motion and has a protrusion at an eccentric position on the other end; and a sub-valve that engages with the protrusion with play within the sub-valve box and is pushed and displaced by the protrusion. the sub-valve body is pushed in a direction to close the sub-valve by a biasing spring when the ball valve body is located in a state where the primary side passage and the secondary side passage are electrically connected. , the protrusion displaces the auxiliary valve body against the biasing spring by the rotation after the ball valve body rotates and the primary side passage and the secondary side passage are completely shut off. . A water drain valve, characterized in that a sub-valve is opened to discharge water in the secondary piping.