JPH0740781Y2 - Flow control valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a flow rate adjusting valve having a movable valve body for adjusting the flow rate and pressure of a pressurized fluid in a cooling water supply system.

[Conventional technology]

Generally, the water supply system for cooling generator coils and bearings and sealing water for turbine main shafts in hydroelectric power plants for business use is based on direct water supply only to the pipeline or by pipeline equipment via a water supply pump. All of them are roughly adjusted and maintained in order to obtain proper flow distribution and pressure to various equipment.

Conventionally, it is general to use both a valve system and a diaphragm plate system for adjusting the flow rate and the pressure.

That is, this combined use is a combination of stepless adjustment and fixed adjustment, which meet various conditions of various devices constituting the water supply system and respond to changes in the system conditions.

For example, a valve called a gate valve or regulator valve
The operation of the valve element is known in Japanese Utility Model Laid-Open No. 63-36766 and the shape of the valve body and valve hole is known in Japanese Utility Model Laid-Open No. 63-53077, and various other names are also known. A valve is provided.

In each of these conventional examples, the valve hole is formed or defined by providing a valve seat as an operating member.

In addition, the water piping system in the above-mentioned power generation equipment often adopts a dendritic pipeline network, the fluid is ordinary river water and the temperature is in the normal temperature range, but the environment of the inflow water system is different and , Requires a unique selection of equipment in each region.

[Problems to be solved by the device]

In a water supply system under such an environment, corrosion, scale adhesion and wear due to aging of each device will occur, which will increase the operation loss related to maintenance and inspection and increase the number of adjustments and repairs. There was a problem.

This deterioration of the equipment is an unavoidable problem in terms of the life of the equipment, and has generally been accepted as a cost required for maintenance and inspection.

In particular, valve seats cannot be operated or damaged due to rusting / sticking or erosion (cavitation erosion), and replacement of diaphragm plates and diameter selection require water cutoff and main machine operation stoppage, which is a major maintenance issue. I have had.

Furthermore, the labor required for adjustment, replacement, repair, cleaning, etc. in maintenance has resulted in an increase in running costs.

The cause of the above problems of the cooling water supply system of the hydroelectric power generation facility is largely controlled by the deterioration of the valve and the throttle plate when the environment of the inflow water system is inevitable.

The present invention has been made in view of such circumstances,
It is an object of the present invention to solve the above-mentioned drawbacks and to provide a flow rate adjusting valve having an improved valve structure, facilitating optimum adjustment of water passage area (flow passage cross section) and improving product life. Is.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, according to the present invention, the valve body member (6) and the valve body lid (7) are overlapped in the flow path direction and sandwiched by the companion flanges (8, 9) to form the valve body member (6). A valve housing having a flow path concentric with the valve hole (2) is constituted, and the valve body (4) housed in the valve chamber (5) is screwed into the valve rod (3) for movably operation and the valve rod ( 3) is characterized in that a stop nut (13) is provided at the other end and the position is narrowed and fixed.

The specific configuration is as follows: a valve hole (2) concentric with the axis (1) of the flow path, and a valve rod (3) on a plane orthogonal to this axis (1).
A valve body (4) screwed onto the valve body (6) so as not to rotate with the valve body member (6), and a valve chamber () formed in a rectangle whose longitudinal direction is the sliding direction of the valve body (4). 5) and a valve body member (6) having a lock nut (13) mounted on the other end of the valve rod (3) is vertically moved by rotation of the valve rod (3), and the lock nut (13). ), The valve body (6) which is throttled and fixed by the
The valve body member (6) and the valve body cover (7) for supporting the valve body member (6)
Are stacked in the flow path direction and are sandwiched by companion flanges (8, 9) and fixed by bolting to form a valve housing.

Further, an opening gauge (14) may be provided on the extended valve rod (3).

[Action]

The valve body (4) is operated up and down by the rotation of the valve rod (3), and is fixed by restricting it with the lock nut (13) so that the water passage area (flow passage cross section) can be adjusted steplessly.

The display of the opening degree meter (14) is linear with the operation of the valve body (3).

〔Example〕

A specific configuration of an embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an assembly view showing a valve housing and each member configuration.

2 is a front view seen from the flow path direction, and FIG. 3 is a cross-sectional view taken along the line AA in FIG.

As shown, the valve hole (2) is concentric with the flow axis (1).
Of the valve body member (6) having the valve body, the valve body lid (7) supporting the valve body member, and the companion flanges (8, 9) sandwiching them, at least at four diagonal points equidistant from the axial centers. A through hole (10) is provided.

The companion flanges (8, 9) are made of the same member, and bolting can be performed from any direction, and there is no difference in performance no matter which direction the flow path is adopted.

In the valve body member (6), a shaft hole (12) through which the valve rod (3) penetrates and a rectangle whose longitudinal direction is the sliding direction of the valve body (4) are formed on a surface orthogonal to the axis line (1). Formed valve chamber (5)
And an O-ring groove (11) for sealing the valve chamber (5) is provided on the side in contact with the valve body lid (7).

The valve body (4) has an arcuate recess, is screwed onto the valve rod (3), and is attached to the valve body member (6) in a rotationally non-rotatable manner. The throttle position is fixed by the lock nut (13) of the valve rod (3) which penetrates the valve. This operation can be easily optimally adjusted with one monkey wrench.

Further, the valve stem (3) extending outward from the valve body member (6).
An opening gauge (14) is provided on the to make it possible to display the aperture status on a scale.

The opening degree meter (14) has a nut having the same pitch as the valve body (4) screwed on the valve rod (3).

Then, the valve body member (6) accommodating the valve body (4) and the valve body cover (7) are sandwiched by companion flanges (8, 9) so as to overlap in the flow path direction, and fixed by bolting. It constitutes a valve housing.

In the valve structure of the present invention, the valve seat is not provided as a single actuating member, but instead, the flow passage aperture of the valve body lid (7) and the valve hole (2) of the valve body member (6) have the same shape. As a result, the advantages of the diaphragm plate method (fixed adjustment) are absorbed.
In other words, since the flow path has a substantially circular flow path without any protrusions, it is possible to largely eliminate the catching of the flow, the damage and the failure due to the sticking or erosion of the valve seat, which are seen in conventional valves. It is what is done.

In addition, all members are made of stainless steel (SUS304, SUS410) to improve durability and pressure resistance. (For example, if the diameter is 20 A, the valve thickness is 20 mm.) Next, an example of operating equipment will be introduced for a more specific explanation.

Table 1 shows the outline of the power plant A that was the target of improvement, and Table 2 shows the adjustment results after improvement.

The outline of the cooling water supply system at this time is shown in FIG.

Regarding the application points, it is possible to apply it to the entire water supply system in the case of new installation, and it is possible to modify it in all the points of the conventional valve / throttle plate method in the case of existing installation.

[Effect of device]

The present invention is configured as described above, and has a structure in which the conventional valve seat (single unit) is removed and the protruding portion of the flow path is removed, so damage and failure due to catching of pork can be prevented, Overall product life can be improved. Moreover, since the valve body can be mounted and the valve body can be easily operated from the outside of the housing by squeezing and fixing, the water passage area (flow passage cross section) can be optimally adjusted.

In addition, the compact housing has the advantages of reducing the installation space, suppressing vibration, and improving operability, and can contribute to the omission of maintenance and operation of the water supply system.

Further, within the protection scope of the present invention, it is possible to carry out by modifying the form such as the diameter and the bolt through hole, and it can be applied to various fluid management, so that it has an extremely high value in industry.

[Brief description of drawings]

FIG. 1 is an assembly view showing a valve housing and each member configuration. FIG. 2 is a front view seen from the flow path direction. FIG. 3 is a sectional view taken along the line AA in FIG. FIG. 4 is a schematic diagram of a cooling water supply system in an example of operating equipment. 1 ... Axis, 2 ... Valve hole, 3 ... Valve rod, 4 ... Valve body, 5
…… Valve chamber, 6 …… Valve member, 7 …… Valve lid, 8 …… Companion flange (bolt side), 9 …… Companion flange (nut side),
10 …… Bolt insertion hole, 11 …… O-ring groove, 12 …… Shaft hole, 13 …… Set nut, 14 …… Opening gauge, 15 …… Fastening through bolt, 16 …… Fastening nut.

Claims (3)

[Scope of utility model registration request] 1. A flow rate adjusting valve for adjusting the flow rate and pressure of a pressurized fluid, wherein a valve body member (6) and a valve body cover (7) are overlapped in a flow direction and companion flanges (8, 9) are provided. The valve hole (2) of the valve body member (6) is attached.
A valve housing having a flow path concentric with that of the valve body, and the valve body (4) housed in the valve chamber (5) is screwed into the valve rod (3) for movable operation and the other end of the valve rod (3). Lock nut (1
3) The flow rate control valve is characterized in that it is provided and the position is throttled and fixed. 2. A flow rate adjusting valve for adjusting the flow rate and pressure of a pressurized fluid, comprising: a valve hole (2) concentric with an axis (1) of a flow channel; and a surface orthogonal to the axis (1). A valve body (4) screwed onto the valve stem (3) and attached so as not to rotate with the valve body member (6).
And a valve body member having a valve chamber (5) formed in a rectangle whose longitudinal direction is the sliding direction of the valve body (4), and a lock nut (13) mounted at the other end of the valve rod (3). The valve body (6) is opened and closed by the rotation of the valve rod (3) and is throttled and fixed by a lock nut (13) in a flow passage cross-section so that the valve body (6) can be opened and closed. A valve housing in which a body member (6) and a valve body lid (7) supporting the body member (6) are overlapped in the flow path direction, and are sandwiched by companion flanges (8, 9) and fixed by bolting. Flow control valve. 3. The flow rate adjusting valve according to claim 1, wherein the extended valve rod (3) is provided with an opening degree meter (14).