JPH0238784A - Switching valve device - Google Patents

Abstract

PURPOSE:To prevent the generation of vibrational and impulsive phenomena by providing a gentle stream chamber for receiving the flow in a valve box and controlling the pressure in the gentle stream chamber by means of an automatic throttle adjusting passage. CONSTITUTION:A slide valve edge side member 10 pressed toward a sack chamber (g) by means of an equalizing spring is provided on the downstream side of a switching valve 6. An entrance passage (a) is communicated with the sack chamber (g), and a gentle stream chamber (c) is formed on the downstream side of the switching valve 6. The flow passed through the switching valve 6 is flowed into the gentle stream chamber, and the pressure in the gentle stream chamber is controlled by means of an automatic throttle adjusting passage (d). As a result, the generation of vibrational and impulsive phenomena can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION A.Objective of the invention ``Field of industrial application'' The present invention relates to an on-off valve device installed in a fluid transport pipe, and more particularly, to an on-off valve device installed in a fluid transport pipe, and more particularly, to Concerning means for preventing and eliminating vibration phenomena and shock phenomena caused by turbulent flow.

``Prior art'' Opening/closing valve devices, that is, shutoff devices with a closing member that opens and closes relative to the valve seat, such as butterfly valves and gate valves, are used to open the valve member [by IA71 (7), to open and close the valve. Although the flow rate is controlled appropriately, at this time, the flow passing through the valve opening tends to become a turbulent flow, causing force, vibration phenomena, and impact phenomena (including cavitation phenomenon), which can damage the main part of the valve. This has caused problems such as rapid erosion and damage, and severe noise and vibration, making it difficult to take countermeasures.

In conventional on-off valve devices, for example, comb-like protrusions are provided for the flow passing through the valve opening as a means to eliminate or alleviate the damage caused by the above-mentioned phenomena.
Alternatively, by protruding a perforated plate of an appropriate shape or partially forming the valve member with a perforated plate, the radical flow energy of the flow that is throttled and ejected at the valve opening can be dissipated by dividing the flow. I was trying to let him do it.

``Problem to be solved by the invention'' However, as in the conventional on-off valve device, at the valve opening,
There is a practical limit to adequately diffusing and dissipating the radical flow energy of a flow that is throttled and ejects as a turbulent flow, and as the throttle differential pressure increases or the valve diameter increases. , the vibration and impact phenomena are becoming more and more intense.

In the present invention, the above-mentioned vibration phenomena and shock phenomena caused by the flow passing through the valve opening of the main opening/closing valve are essentially not generated, so that even if the opening/closing valve device is enlarged, or
Even if the flow rate control ratio in the on-off valve is set high,
The objective is to obtain a quiet and highly reliable opening/closing valve device without any problems.

1 Structure of the Invention ``Means for Solving the Problems'' This invention will be explained based on the drawings of an embodiment. In FIG. 7 indicates an opening/closing valve body, and 10 and If indicate an end member and a cylindrical member of the sliding valve body, respectively.

4 is a closing surface member of the slide valve provided corresponding to the end edge 11m of the cylindrical member 11, and 5 is a partition wall fixed to the valve box corresponding wall 8 and facing the cylindrical member 11 of the slide valve. It is a member.

Reference numeral 12 indicates a balance spring, and reference numeral 13 indicates a communication pipe that equalizes the pressure between the flow path a and the bag chamber g.

Therefore, in the on-off valve device of the present invention, a slow-flow chamber C is provided in the valve box to temporarily receive the flow, and the pressure in this slow-flow chamber C is controlled by a valve configured to correspond to the opening of the on-off valve. The flow at the opening of the valve is maintained in a gentle and stable state by controlling the automatic throttle adjustment passage d associated with the slide valve and minimizing the difference in pressure level before and after the opening/closing valve. be.

``Function'' Observing the function in FIG. 1, the on-off valve body 7 is now in a fully open state, so the flow is even and there is almost no flow resistance.

Further, the pressure in the flow path a, that is, the bag chamber g, and the pressure in the slow flow chamber C are almost equal, and the pressure received by the front and rear surfaces of the end member 10 of the slide valve is balanced, so that the spring 12 is applied to the valve opening of the slide valve. d is also fully open.

Next, in order to control the flow rate, when the on-off valve body 7 is turned to sufficiently narrow the flow, the magnitude of the flow resistance is clearly seen as shown by the imaginary chain line in the drawing, and the occurrence of biased turbulent flow is confirmed.

At this time, in this device, the slide valve opening d is closed by the pressure difference between the front and rear surfaces of the slide valve end member 10 due to the flow loss that occurs, commensurate with the force of the balance spring 12, and the automatic throttle adjustment passage is closed. Demonstrate performance.

The flow velocity at the opening of the on-off valve can be maintained at a slow and stable state close to the predetermined pipe flow velocity.

According to the embodiments shown in FIGS. 1 and 3, as is clear from the drawings, if there is a passage only in the vicinity of the serrated tip shown by the imaginary chain line on the sliding valve closing surface member, When the slow flow chamber C becomes clogged with sand or dirt, the internal pressure of the slow flow chamber C increases and the automatic throttle adjustment passage d immediately closes.
It has the advantage of having an automatic cleaning action that spreads them out and expels them.

"Embodiments" Examples of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows a straight type on-off valve device in which the on-off valve is arranged on the entrance side of the valve box and the sliding valve portion is formed in the center of the valve box.

Therefore, the flow direction is as follows: inlet flow path a→opening/closing valve open b→slow flow chamber C→slip valve open d→outlet flow path e, and the bag chamber g is communicated with the inlet flow path a. There is.

In Figure 2, the on-off valve is placed on the outlet side, and the sliding valve part is placed on the first side.
Like the one shown in the figure, it is a straight type built in the center of the valve box.

In the drawing, the flow direction is in the order of inlet flow path e - sliding valve open d → slow flow chamber C → on/off valve open b → outlet flow path a, and the bag chamber g is communicated with the outlet flow path a. ing. The operating direction of the slide valve is opposite to that of FIG. 1.

In Figure 3, the on-off valve is placed on the inlet side as in Figure 1,
This is a pend type valve that uses the valve box corresponding wall portion 48 as a lid to facilitate disassembly and inspection of the sliding valve portion. Its operation is 191 similar to that in FIG. 1, and the bag chamber closing gasket 55 shows the relationship between good airtightness and the lightness of the slide valve when the opening/closing valve is closed.

C1 Effects of the Invention The on-off valve device of the present invention completely innovates the drawbacks of various conventional valve devices, and is especially effective when used in flow rate control valve devices, resulting in major improvements in water management. It's Uruchino.

[Brief explanation of the drawing]

1, 2, and 3 are longitudinal cross-sectional views showing one embodiment of the present invention. In Fig. 1, 1...open/close valve box part, 2...sliding valve box part, 3...
・Opening/closing valve seat member, 4...Sliding valve closing surface member, 5...
・Partition wall member, 6... Opening/closing valve shaft, 7... Opening/closing valve body, 8
... Valve box compatible wall, 9... Slip valve valve stem, 10...
Slip valve end side member, 11... Slip valve cylindrical member, 12...
・Balancing spring, 13...Communication pipe, 14...Shutoff valve, a...Inlet O flow path, b...Opening/closing valve opening, C...
・Slow flow chamber, d...Slip valve open [J, e...Outlet flow path, g...Bag chamber, Same as above Shingo Yokota ℃ type Myoko 2I! 7 δ,! IF Bokuto/Kabe Wholesale 2″j′fr Hakosuiwoke

Claims (1)

[Claims] 1. In the on-off valve device, the sliding valve cylindrical member (11) is fitted in a sealing and slidable manner to the partition member (5) fixed to the valve box portion in correspondence with the valve opening (b) of the on-off valve. and an automatic throttle adjustment passage is formed between the end edge (11m) of the cylindrical member and the corresponding closing surface member (4) of the slide valve by the valve opening (d) of the slide valve; Between the slide valve end member (10) and the valve box part or the joint fixing part, there is a balance spring (12) that always acts in the direction of opening the valve opening (d) of the slide valve with a predetermined force. ), and the bag chamber (g) enclosed and formed by the sliding valve end side member (10) and the valve box corresponding wall part (8) is used as a slow flow chamber (c) with respect to the on-off valve. is connected to the flow path (a) on the opposite side, and the valve opening (b) of the on-off valve is connected to the flow path (a) on the opposite side.
An on-off valve device comprising a slow flow chamber (c) at a predetermined pressure in the flow path between the valve opening of the slide valve, that is, the automatic throttle adjustment passage (d).