JPH0670006U - Angle valve - Google Patents

Abstract

(57) [Summary] [Purpose] The decompression burden of the orifice can be freely adjusted according to changes in operating conditions, extending the life of the plug and enabling measurement of the differential pressure across the orifice. , It is possible to confirm whether the pressure reduction ratio of the plug portion and the orifice portion is the optimum pressure reduction ratio. A variable throttle mechanism 30 that forms a variable orifice is arranged between the seat ring 8 and the tail piece 4 so that the drive section 40 can adjust the pressure reduction ratio of the orifice section. Further, pressure take-out holes 31 and 32 are formed in the seat ring 8 and the tail piece 4 so that the differential pressure between the upstream side and the downstream side of the orifice portion can be detected by the differential pressure transmitter 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention particularly relates to an angle valve for controlling the pressure reduction of a slurry fluid with a high differential pressure.

[0002]

[Prior art]

 An angle valve is generally used for the pressure reduction / control line for coal slurry in a coal liquefaction plant or the pressure reduction / control line for a solid-liquid two-phase flow containing various catalysts in a chemical plant. The angle valve has the advantage that the piping system can be designed compactly because the flow direction of the fluid can be bent at a right angle. However, if the angle valve is excessively decompressed on the downstream side of the valve, a large amount of gas is generated in the over-decompression section and tends to become a flush fluid (gas-liquid two-phase flow). When doing so, scratching and corrosion of the trim part will be a problem.

FIG. 3 shows a conventional example of a single-seat type angle valve of this type. 1 is a horizontal upstream pipe, and 2 is a vertical pipe below the downstream opening end of the upstream pipe 1. The downflow side pipes 3 and 4 are angle valves and tail pieces connected between the upstream side pipe 1 and the downstream side pipe 2. The angle valve 3 is fitted into the valve body 7 having a fluid inlet 5 which is orthogonal to each other and which is horizontally opened and a fluid outlet 6 which is vertically downwardly opened, and a fluid outlet 6 from below through a gasket 9. A seat ring 8, a valve shaft 12 that is vertically movably inserted into a valve shaft insertion hole 10 that opens on the upper surface of the valve body 7 through a seal member 11, and a plug holder 13 at the lower end of the valve shaft 12. Valve plug 15 that is mounted on the valve ring 15 to control the opening and closing of the fluid flow hole 14 of the seat ring 8, a guide bush 16 that is inserted in the valve shaft insertion hole 10 and slidably guides and holds the plug holder 13, and a valve shaft. A packing follower 17 that is inserted into the upper end opening of the insertion hole 10 and presses the seal member 11, and a packing that is fixed to the upper surface of the valve body 7 by a plurality of bolts 18 to press and fix the packing follower 17. Consists lunge 19 etc., the fluid inlet 5 is connected to the downstream side opening end of the upstream pipe 1, the fluid outlet 6 Terupi over scan 4 is connected via a seat ring 8. The tail piece 4 holds the seat ring 8 in cooperation with the valve body 7 by being fixed to the lower surface of the valve body 7 with a plurality of bolts 20, and the upper end opening of the passage 21 formed through the center thereof. The portion is connected to the lower end opening of the seat ring 8 through the fixed orifice 22, and the lower end is connected to the upper end opening of the downstream pipe 2. Therefore, as shown in FIG. 4, the controlled fluid 24 is depressurized in two stages at the plug portion A and the orifice portion B, whereby the decompressed load on the valve plug 15 is reduced and the life of the plug is prolonged. That is, on the downstream side of the valve, solid particles pass through the in-valve throttle portion (plug portion A) at high speed, so that the outer peripheral surface of the valve plug 15 and the inner peripheral surface of the fluid flow hole 14 are abraded and worn. As a result, the flow path expands beyond the original design value, and the valve opening is lowered to maintain the decompression performance. If the valve is worn down and the valve opening is exhausted, the valve life will be extended. Up to now, no product with a long life has been developed, so a fixed orifice 22 is incorporated to create a two-stage depressurization structure to reduce the load on the valve plug 15. When designing such a fixed orifice 22, the pressure and flow rate values that are normally used are known from the plant operating conditions, and the burden reduction distribution of the plug-orifice is set. The fixed orifice 22 is fixed in the seat ring 6 by an orifice retainer 23 fitted into the upper end opening of the tail piece 4.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional angle valve, since the fixed orifice 23 is used, it is not possible to change the decompression ratio of the plug portion A and the orifice portion B once it is assembled, and therefore the operating conditions change and the passing flow rate changes. However, there is a problem that the decompression burden of the orifice portion B cannot be adjusted to an optimum value. In addition, it was not possible to confirm whether the pressure reduction ratio during plant operation was the optimum pressure reduction ratio.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to freely adjust the decompression burden of the orifice portion according to changes in operating conditions and the like. This makes it possible to extend the life of the plug, measure the differential pressure before and after the orifice, and check whether the pressure reduction ratio between the plug and orifice is the optimum pressure reduction ratio. The purpose is to provide the angle valve.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a valve plug that opens and closes a fluid passage hole of a seat ring that is fitted into a fluid outlet opening on the bottom surface of a valve body, and a valve plug that is disposed below the valve body and that seat In an angle valve having a tail piece that holds the ring, a variable throttle mechanism is arranged between the seat ring and the tail piece, and a pressure take-out hole communicating with the internal flow passage is provided on the outer periphery of the seat ring and the tail piece. Each is formed.

[0007]

[Action]

 In the present invention, the variable throttle mechanism forms a variable orifice portion, and freely changes the pressure reduction ratio of the orifice portion. The pressure take-out hole makes it possible to measure the differential pressure between the upstream side and the downstream side of the orifice, and to check whether the pressure reduction ratio between the plug and orifice is the optimum pressure reduction ratio.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of an essential part of an angle valve according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an essential part of a variable throttle mechanism. The same components as those of the conventional device shown in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, a variable throttle mechanism 30 is installed between the seat ring 8 and the tail piece 4, and pressure take-out holes 31 and 32 which communicate with the fluid flow hole 14 of the seat ring 8 and the flow path 21 of the tail piece 4, respectively. It is formed on the outer circumferences of the seat ring 8 and the tailpiece 4, and is configured so that the differential pressure between the upstream side and the downstream side of the variable throttle mechanism 30 is measured by the differential pressure transmitter 33.

The variable throttle mechanism 30 is composed of an outer cylindrical body 34A formed in a cylindrical shape and an inner cylindrical body 34B made of a wear resistant material such as sintered diamond, and an upper end opening portion thereof is a fluid passage hole 14 of the seat ring 8. And a cylindrical holder 35 whose lower end opening communicates with the flow path 21 of the tailpiece 4 and a cylindrical holder 35 fixed to the outer peripheral surface of the cylindrical body 34 by welding or the like so as to be movable back and forth. A narrowing member 38 having a small-diameter tip portion 38a inserted into an insertion hole 36 formed in the cylindrical body 34 and protruding into the flow path hole 37 of the cylindrical body 34, and a direction in which the narrowing member 38 projects from the holder 35. And a drive unit 40 for moving the diaphragm member 38 forward and backward. The drive unit 40 is controlled by an output control signal from a controller 41 which records the output signal of the differential pressure transmitter 33. Drive controlled It is configured. The diaphragm member 38 forms a variable orifice that changes the resistance of the flow path hole 37 by being moved back and forth by the drive unit 40, and the tip end portion 38a facing the flow path hole 37 and the inner cylindrical body 34B. Similarly, it is formed of a wear resistant material such as sintered diamond. Other configurations are similar to those of the conventional device.

In such a configuration, the pressures on the upstream side and the downstream side of the variable throttle mechanism 30 are taken out by the pressure take-out holes 31 and 32, and the differential pressure thereof is measured by the differential pressure transmitter. A change in the pressure reduction ratio between A and the orifice B (see FIG. 4) can be constantly monitored, and when the drive unit 40 is driven to move the diaphragm member 38 back and forth based on this, the pressure reduction ratio can be changed. Therefore, even if the operating conditions change, it is possible to always maintain the optimum decompression ratio.

Although the diaphragm member 38 is driven by the driving unit 40 in the above-described embodiment, the present invention is not limited to this, and the operator manually adjusts each time according to the change in the differential pressure. Of course, it is okay.

[0012]

[Effect of device]

 As described above, the angle valve according to the present invention is provided with the variable throttle mechanism that forms the variable orifice on the downstream side of the plug portion, and the pressure on the upstream side and the downstream side of the orifice portion is taken out by the pressure take-out hole. Therefore, when the operating conditions change, the decompression load on the orifice can be adjusted to the optimum value, and therefore the decompression ratio between the plug and the orifice can always be maintained at the optimum decompression ratio. The life of the plug can be extended. Further, by measuring the pressure difference before and after the orifice portion by the pressure take-out hole, it is possible to confirm whether or not the optimum pressure reduction ratio is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of an angle valve according to the present invention.

FIG. 2 is a sectional view of a main part of a variable aperture mechanism.

FIG. 3 is a cross-sectional view of an essential part showing a conventional example of an angle valve.

FIG. 4 is a view showing a flow path structure in the trim of the angle valve.

[Explanation of symbols]

 1 Upstream Side Pipe 2 Downstream Side Pipe 3 Angle Valve 4 Tail Piece 5 Fluid Inlet 6 Fluid Outlet 7 Valve Body 8 Seat Ring 14 Fluid Circulation Hole 15 Valve Plug 21 Passage 30 Variable Throttle Mechanism 31, 32 Pressure Extraction Hole 33 Differential Pressure Transmitter 38 Throttle member 40 Drive unit

Front page continuation (72) Creator Mitsuo Kameyama 6-9-9 Komagome, Toshima-ku, Tokyo (72) Creator Tatsushi Shinogaya 29-3 Takatsuto-cho, Midori-ku, Chiba-shi, Chiba (72) Creator Koichi Okawa Kanagawa 4-1-1 Omagari, Samukawa-machi, Takaza-gun, Yamanaka Yamatake Honeywell Co., Ltd. Shonan factory (72) Inventor Yoshiyuki Okutsu 4-1-1, Omagari, Samukawa-machi, Takaza-gun, Kanagawa Yamatake Honeywell Co., Ltd. Shonan factory

Claims (1)

[Scope of utility model registration request] 1. A valve plug for opening and closing a fluid passage hole of a seat ring fitted into a fluid outlet opening on the lower surface of the valve body, and a tailpiece arranged below the valve body for sandwiching the seat ring together with the valve body. An angle valve having a variable throttle mechanism arranged between the seat ring and the tailpiece, and pressure take-out holes communicating with the internal flow passage are formed on the outer periphery of the seat ring and the tailpiece, respectively. valve.