JP2579891B2 - Lower valve body cleaning device for double seal valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a lower valve body in a double seal valve.

[0002]

2. Description of the Related Art When a valve is opened, the balance piston moves upward, and the outer peripheral surface of the balance piston comes into contact with the processing liquid or the like. When the valve is closed, the outer peripheral surface that comes into contact with the outside air comes into contact with the outside air. If the liquid is kept in contact with the outside air, there is a possibility that the adhering liquid may be deteriorated or decomposed by bacteria, and may be mixed into the processing liquid and contaminated when the valve is opened again. For this reason, when the valve is closed, it is necessary to clean the portion in contact with the outside air. In order to achieve this necessity, for example, a type in which the outside of the balance piston is covered with a cover having a closed structure and the cover is provided with a cleaning liquid supply port and a discharge port can be considered. It is necessary to make the stroke longer than the stroke of the balance piston.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a novel double-seal valve lower valve body cleaning device which is devised to eliminate the cause of contamination at the time of re-opening the valve and to conserve the cleaning liquid. It is intended to provide.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a lower valve body cleaning device in a double seal valve according to the present invention has a fluid inlet conduit and a fluid outlet conduit and includes an inlet conduit and an outlet. A valve housing having an upper valve seat and a lower valve seat arranged vertically between conduits, and an upper pipe provided with an upper through-hole at a location above the valve seat in the valve housing and provided on a cutting edge of the upper through-hole. Part, a lower tube portion provided on the upper surface of the cutting edge of the lower through hole by opening a lower hole at a position below the valve seat in the valve housing,
A first piston rod having a lower end extending to the center of the upper and lower valve seats via the upper pipe portion, a second tubular piston rod movably mounted on an extension of the first piston rod, and a second piston rod An upper valve body seated on an upper valve seat provided at a lower end of the cleaning valve, a cleaning liquid jet opening formed at a position near an inner periphery of the upper valve seat on a lower surface of the upper valve body, and a side surface of the upper pipe portion with respect to the cleaning liquid jet port. A flow path for supplying a cleaning liquid from the
A downward cleaning liquid discharge pipe connected to the lower end of the first piston rod so as to reach the lower pipe section through the outlet conduit, and a lower part provided at the upper end of the cleaning liquid discharge pipe and seated on the lower valve seat. A side valve body, including a balance piston that moves up and down along a lower pipe portion provided at a lower end portion of the cleaning liquid discharge pipe,
The present invention relates to a double seal valve in which cleaning is performed by opening both upper and lower valve bodies, opening only the upper valve body, and opening only the lower valve body. A half of the stroke of the balance piston on the inner peripheral surface of the lower pipe portion as a positional relationship surrounding a portion which is not washed by the washing when the valve body is opened, the upper valve body is opened, and the lower valve body is only opened. The lower cleaning liquid flow path having a width of is formed, a lower cleaning liquid supply port is provided on the outer wall of the lower cleaning liquid flow path, and the wall of the lower pipe portion is squeezed to be close to the outer peripheral surface of the balance piston. This forms a discharge gap at the lower edge of the lower cleaning liquid flow path.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in the figures has an inlet conduit 1 and an outlet conduit 2 for the fluid and between these inlet conduits 1 and outlet conduits 2 an axial upper valve seat 3 and a cylindrical lower valve. A valve housing 5 having a seat 4 is formed, and an upper through hole 6 is opened at a position above the valve seats 3 and 4 in the valve housing 5, and an upper pipe portion 7 is provided on the upper surface of a cutting edge of the upper through hole 6. A lower through hole 8 is opened at a lower portion, and a lower tube portion 9 is provided on a lower surface of a cutting edge of the lower through hole 8, and an upper and lower two chambers 11 and 12 are formed at an upper end of the upper tube portion 7 by an intermediate wall 10. A separate cylinder 13 is provided,
A rod-shaped first piston rod 14 penetrating vertically through the upper and lower two chambers 11 and 12 is passed through the cylinder 13 and the lower end of the first piston rod 14 is connected to the center of the upper pipe 7 and the upper and lower valve seats 3 and 4. And the first piston rod 14
In the above, upper, middle and lower collars 15, 16 and 17 are provided in the upper chamber 11 of the cylinder 13 to
And a first piston 18 between the middle collar 16 and the lower collar 17, and a second piston 19 between the middle collar 16 and the lower collar 17 so as to be vertically movable. A first coil spring 20, which constantly presses the first piston 18 upward and the second piston 19 downward, is sandwiched.
A first port 22 for sending and exhausting air between the first and first pistons 18, and a second port 24 for sending and exhausting air between the same wall 10 and the second piston 19 on the intermediate wall 10, respectively. In the case where the air is exhausted from the first and second ports 22 and 24, the upper surface of the first piston 18 is
The lower surface of the first piston and the lower surface of the upper collar 15 are pressed against the upper surface of the intermediate wall 10 and the upper surface of the middle collar 16, respectively.

[0006] A tubular second piston rod 26 is vertically movably mounted on the first piston rod 14 at a location existing in the lower chamber 12, the upper pipe section 7, and the inlet conduit 1. A third piston 27 that moves up and down in the lower chamber 12 and engages with the locking portion 25 is supported at the upper end of the lower chamber 12, and a cylindrical hollow chamber 28 is provided on the inner peripheral surface of the second piston rod 26. A spring seat 29 is provided at a position existing in the cylindrical hollow chamber 28 of the cylinder 14 and a second piston weaker than the first coil spring 20 between the lower surface wall of the cylindrical hollow chamber 28 and the lower surface of the spring seat 29 in the first piston rod 14. The coil spring 30 is wound, and a third port 32 for sending and discharging air between the lower end wall 31 of the cylinder 13 and the third piston 27 is opened. If the state of being discharged from the preparative 32 so that the upper surface of the third piston 27 is pressed against the lower surface of the intermediate wall 10.

Further, an upper valve body 35 seated on the upper valve seat 3 is integrally provided at a lower end portion of the second piston rod 26, and an upper cleaning liquid reservoir is formed by making an inner diameter of an intermediate portion of the upper pipe portion 7 large. The upper cleaning liquid supply port 37 for the upper cleaning liquid reservoir 36 is formed in the wall of the intermediate portion at the intermediate portion, and the upper cleaning liquid reservoir 36 has an upper end on the joint surface between the upper valve body 35 and the second piston rod 26. The lower end is the same valve body 35
A cleaning liquid guide hole 38 is provided on the lower surface of the cleaning liquid. The cleaning liquid first outlet 47 and the center of the upper surface of the lower valve body 41 communicate with the cleaning liquid guide hole 38 and face toward the lower valve seat 4. A second cleaning liquid outlet 48 is provided.

Further, a downwardly directed washing liquid discharge pipe 40 which reaches the lower pipe section 9 through the outlet conduit 2 is connected to the lower end of the first piston rod 14, and the lower end of the lower side of the washing liquid discharge pipe 40 is connected to the lower side. The lower valve body 41 seated on the valve seat 4 is provided with a hollow hermetic cylindrical balance piston 42 which slides up and down along the inner peripheral surface of the lower tube portion 9 at the lower end. In the outer peripheral surface, the upper and lower valve bodies 35 and 41 are opened, the upper valve body 35 is opened, and the lower valve body 41 is opened only. A lower cleaning liquid flow path 43 having a width half that of the stroke of the balance piston 42 is formed on the inner peripheral surface of the lower cleaning liquid flow path 43, and a lower cleaning liquid supply port 44 is provided on an outer wall of the lower cleaning liquid flow path 43. Squeeze the nine walls Is obtained by forming a cleaning liquid discharge port 45 by narrowing the diameter squeezing likewise lower edge of the discharge gap 46 at the lower edge of the lower washing solution flow path 43 by proximity to the outer circumferential surface of the lance piston 42.

The above embodiment operates as follows. That is, when air is supplied from the first port 22 when the upper and lower valve bodies 35 and 41 are in the closed state (fully closed state), the first piston 18 descends and first contacts the middle collar 16. Then descend further and the middle collar 16,
The first piston rod 14, the cleaning liquid discharge pipe 40, and the balance piston 42 are pressed down, so that the lower valve body 41 is opened while the upper valve body 35 is closed (see FIG. 4). (A state in which the lower side is partially opened for cleaning)

When air is supplied from the second port 24 when the upper and lower valve bodies 35 and 41 are closed, the second piston 19 rises and first comes into contact with the middle collar 16 (this contact). In this state, the upper portion of the lower valve body 41 is fitted into a recess 49 provided on the lower surface of the upper valve body 35 as shown in FIG. 3). The first piston rod 14, the cleaning liquid discharge pipe 40, the balance piston 42, the lower valve body 41, the second piston rod 26, and the upper valve body 35 are pulled up, and thus the upper and lower valve bodies 35, 41 are opened to enter the fluid. The conduit 1 and the outlet conduit 2 are in a communicating state (see FIG. 2). (Washing with fully open)

When air is supplied from the third port 32 when the upper and lower valve bodies 35 and 41 are closed, the third piston 27 engages with the locking portion 25 and rises to raise the second piston rod 26. And the upper valve body 35 is slightly pulled up, so that the upper valve body 35 is slightly opened while the lower valve body 41 is closed (see FIG. 5). (Washing with the upper side partially open)

When the cleaning liquid is supplied from the upper cleaning liquid supply port 37 in a state where both the upper and lower valve bodies 35 and 41 are closed, the cleaning liquid flows through the upper cleaning liquid reservoir 36 and the cleaning liquid guide hole 38.・ Lower side valve body 35, 41
The liquid enters the space therebetween and is further discharged from the cleaning liquid discharge port 45 through the cleaning liquid discharge pipe 40 (see FIG. 1). (Intermediate cleaning)

When the cleaning liquid is supplied from the lower cleaning liquid supply port 44 when the upper and lower valve bodies 35 and 41 are closed, the cleaning liquid enters the lower cleaning liquid flow path 43 and the balance piston in the same flow path 43. The cleaning liquid is discharged from the cleaning liquid discharge port 45 through a discharge gap 46 between the outer peripheral surface of the lower tube portion 9 and the inner peripheral surface of the lower tube portion 9.

[0014]

The lower valve body cleaning device in the double seal valve according to the present invention has a fluid inlet conduit and a fluid outlet conduit as described above and has an upper valve seat and a lower valve seat between the inlet conduit and the outlet conduit. A valve housing having side valve seats arranged vertically, an upper pipe portion provided on an upper surface of a cutting edge of the upper through hole by opening an upper through hole at a position above the valve seat in the valve housing, and a valve seat in the valve housing. A lower pipe portion provided with a lower through hole at a lower portion and provided on the upper surface of a cutting edge of the lower through hole, a first piston rod having a lower end extended to the center of the upper and lower valve seats via the upper pipe portion, A tubular second piston rod attached to an extension of the first piston rod so as to be vertically movable; an upper valve body seated on an upper valve seat provided at a lower end of the second piston rod; A cleaning liquid jet port opened near the inner periphery of the valve seat and a cleaning liquid jet port A flow path for supplying the cleaning liquid from the side surface of the upper pipe part, a downward cleaning liquid discharge pipe connected to the lower end of the first piston rod so as to reach the lower pipe part through the outlet conduit, and a cleaning liquid discharge pipe. Provided at the upper end of the washing valve, a lower valve body seated on the lower valve seat, and a balance piston provided at the lower end of the washing liquid discharge pipe, which moves up and down along the lower pipe section. Regarding the double seal valve of the type in which the upper and lower valve elements are opened, the upper valve element is opened and the lower valve element is opened, the upper and lower valve elements are opened on the outer peripheral surface of the balance piston. The lower cleaning liquid having a half width of the stroke of the balance piston on the inner peripheral surface of the lower pipe portion as a positional relationship surrounding a portion that is not cleaned by cleaning with only the upper valve body being opened and the lower valve body being opened only. Form a flow path A lower cleaning liquid supply port is provided on the outer wall of the lower cleaning liquid flow path, and a discharge gap is formed at the lower edge of the lower cleaning liquid flow path by narrowing the wall of the lower pipe so as to approach the outer peripheral surface of the balance piston. Open and closed state of upper and lower valve body,
By performing the cleaning in which only the upper valve body is opened and only the lower valve body is opened, it is possible to clean the balance piston including the portion in contact with the outside air on the liquid contact surface.

[0015]

According to the present invention, the cause of contamination at the time of re-opening the valve can be sufficiently eliminated, effective cleaning can be achieved, and the width of the lower cleaning liquid flow path can be reduced by the balance piston. This is half of the stroke, which is convenient for saving the cleaning liquid.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention in a fully closed state.

FIG. 2 is a vertical cross-sectional view similarly showing a fully opened state.

FIG. 3 is a vertical cross-sectional view showing a state in which a fully closed state is being changed to a fully opened state.

FIG. 4 is a longitudinal sectional view showing the lower valve element in a partially opened state.

FIG. 5 is a longitudinal sectional view showing the upper valve body in a partially opened state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid inlet conduit 2 Fluid outlet conduit 3 Upper valve seat 4 Lower valve seat 5 Valve case 6 Upper through hole 7 Upper pipe part 8 Lower through hole 9 Lower pipe part 10 Intermediate wall 11 Upper chamber 12 Lower chamber 13 Cylinder 14 first piston rod 15 upper collar 16 middle collar 17 lower collar 18 first piston 19 second piston 20 first coil spring 21 upper end wall 22 first port 24 second port 25 locking portion 26 second piston rod 27 third Piston 28 Cylindrical hollow chamber 29 Spring seat 30 Second coil spring 31 Lower wall 32 Third port 35 Upper valve body 36 Upper cleaning liquid reservoir 37 Upper cleaning liquid supply port 38 Cleaning liquid guide hole 40 Cleaning liquid discharge pipe 41 Lower valve body 42 Balance piston 43 Lower cleaning liquid flow path 44 Lower cleaning liquid supply port 45 Cleaning liquid discharge port 46 Discharge gap 47 First cleaning liquid injection Outlet 48 Cleaning liquid second spout 49 Recess

Claims (1)

(57) [Claims] 1. A valve housing having a fluid inlet conduit and a fluid outlet conduit and having an upper valve seat and a lower valve seat arranged vertically between said inlet conduit and outlet conduit, and above the valve seat in the valve housing. An upper pipe portion is provided on the upper surface of a cutting edge of the upper through hole by opening an upper through hole at a location, and a lower through hole is opened at a lower portion of a valve seat in the valve housing to provide an upper surface of a cutting edge of the lower through hole. A lower pipe portion provided, a first piston rod having a lower end extended to the center of the upper and lower valve seats via the upper pipe portion, and a second tubular member attached to the extension portion of the first piston rod so as to be vertically movable. A piston rod, an upper valve body seated on an upper valve seat provided at a lower end of the second piston rod, a cleaning liquid jet opening formed at a position near an inner periphery of the upper valve seat on a lower surface of the upper valve body, and a cleaning liquid jet port A flow path for supplying a cleaning liquid from the side of the upper pipe portion to the first piston; A downward cleaning liquid discharge pipe continuously connected to the lower end of the rod as a length reaching the lower pipe section through the outlet conduit, and a lower valve body seated on the lower valve seat provided at an upper end of the cleaning liquid discharge pipe. And, provided at the lower end of the cleaning liquid discharge pipe, provided with a balance piston that moves up and down along the lower pipe part, the cleaning is performed by opening and closing both upper and lower valve bodies, opening only the upper valve body, and For a double seal valve in which only the lower valve element is opened, the upper and lower valve elements are opened on the outer peripheral surface of the balance piston, only the upper valve element is opened, and only the lower valve element is opened. A lower cleaning liquid flow path having a width half the stroke of the balance piston is formed on the inner peripheral surface of the lower pipe portion as a positional relationship surrounding a portion that is not washed by,
A lower cleaning liquid supply port is provided on the outer wall of the lower cleaning liquid flow path,
A lower valve body cleaning in a double seal valve, wherein a discharge gap is formed at a lower edge of the lower cleaning liquid flow path by narrowing a wall of a lower pipe portion so as to approach an outer peripheral surface of a balance piston. apparatus.