JP7300160B2 - valve - Google Patents

Description

The present invention relates to a valve whose opening degree can be adjusted while the valve is left open.

As a valve that can be opened and closed by adjusting the flow rate of fluid, there is a valve body having a fluid flow path as described in Patent Document 1, and a valve body that opens and closes the flow path by contacting and separating from the valve seat. and an actuator for vertically moving a stem having a valve body at its tip.

Japanese Patent Application Laid-Open No. 2017-129256

As a method of adjusting the degree of opening of the above valve, the valve is fully opened to measure the flow rate, and the difference from the target flow rate is measured. If there is an unacceptable difference in the measured flow rate from the target flow rate, close the valve once and adjust the top end position of the stem when the valve is fully open with the opening adjuster to intuitively adjust the opening. adjust. After that, the valve is fully opened again, the flow rate is measured, and the difference from the target flow rate is measured. Again, if there is still an unacceptable difference in the measured flow rate from the target flow rate, repeat the same operation until the flow rate when the valve is fully open is within the allowable range of the target flow rate. This operation is complicated and time-consuming.

With a conventional opening adjuster, if you adjust the upper end position of the stem when the valve is fully open while fluid is flowing, a strong force is applied to the stem. It may rotate together and damage the gland packing or the connection between the stem and the piston.

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve capable of adjusting the flow rate when the valve is fully open while allowing a fluid to flow when the valve is fully open.

The present invention (1) comprises a valve body having a flow path, a valve body for opening and closing the flow path, a stem for moving the valve body in the opening or closing direction by rising or falling, and vertically moving the stem. and an actuator, wherein the actuator has a casing having an internal space in which a drive mechanism is arranged, the top of the casing is provided with an opening adjuster, the opening adjuster is provided on the outer periphery A columnar or cylindrical body having a male thread formed thereon, and a sliding body interposed between the columnar or cylindrical body and the stem, wherein the male thread is a female thread formed at the top of the casing and connected to the internal space. and the lower end of the cylindrical portion or the cylindrical portion and the upper end of the sliding body, and the upper end of the stem and the lower end of the sliding body come into contact when the valve is fully opened. It's a valve.

In conventional valves, the opening adjuster and the upper end of the stem are in direct contact, so when the valve is fully open, high pressure is applied to the contact surface between the opening adjuster and the upper end of the stem. , when the opening adjuster is rotated, the stem is also rotated while a strong force is applied. As a result, a seal ring such as a gland packing and an O-ring provided on the stem, a connecting portion between the stem and the piston, and the like may be damaged. In order to prevent damage, it is necessary to adjust the degree of opening after closing the valve, which requires time-consuming work.

On the other hand, in the valve of the present invention (1), since the opening adjuster has a sliding body between it and the stem, the sliding body rotates before the stem rotates together. Co-rotation of the stem can be prevented, and damage due to co-rotation of the stem does not occur.

The present invention (2) is the valve according to the present invention (1), wherein one of the contact surfaces is a convex surface and the other is a flat surface or a concave surface corresponding to the convex surface. .

In the present invention (2), since the abutment surfaces are not flat, the friction generated on the abutment surfaces is reduced, and the frictional force in the rotational direction transmitted from the opening adjuster to the stem is reduced. As a result, co-rotation of the stem can be further prevented.

The present invention (3) is the valve according to the present invention (1) or (2), wherein the sliding body has a flange at its upper end, and the columnar or cylindrical body has a flange at its lower end. and a pin insertion hole formed from the side surface so as to intersect the flange accommodation space in which the valve is accommodated, and the flange is supported by the pin inserted into the pin insertion hole. is.

The present invention (4) is the valve according to any one of the present inventions (1) to (3), wherein a piston is provided integrally with the stem in the internal space and is raised by introduction of a driving fluid; The valve is equipped with a compression coil spring arranged to press the piston downward.

Present invention (4) is the valve according to any one of present inventions (1) to (3), wherein the drive mechanism includes a piston and a compression coil spring. Since the piston and stem are integrated, when the conventional opening adjuster is rotated, the stem rotates together, and the C-ring, etc., for integrating the stem and piston, and the space between the piston and casing. Packing and the like may be damaged, but such damage is less likely to occur in the valve provided with the opening adjuster of the present invention.

The sliding body has a flange, and the columnar or cylindrical body has a flange accommodating space in which the flange is accommodated and a pin insertion hole formed from the side surface so as to intersect the flange accommodating space at the lower end. It is Since the pin is inserted into the pin insertion hole, the flange is supported by this pin, and the sliding body is prevented from falling off.

According to the valve of the present invention, it is possible to adjust the flow rate when the valve is fully open while allowing the fluid to flow with the valve fully open.

1 shows the appearance of one embodiment of a valve according to the invention; 1 shows a cross-sectional view of one embodiment of a valve according to the invention; FIG. 1 shows an embodiment of an opening degree adjuster used in the valve according to the invention; 4 shows a cross-section of the opening degree adjuster shown in FIG. 3;

Embodiments of the present invention will be described below with reference to the drawings. In the following description, "up and down" refers to the top and bottom of the drawing. This "up and down" is for convenience, and when installed, it may be upside down or horizontal.

The valves shown in FIGS. 1 and 2 are called Y-type valves, but the valves according to the present invention are not limited to Y-type valves. As for directions, "up and down" is used, with the direction toward the upper right being defined as the upward direction and the direction toward the lower left being defined as the downward direction.

A valve 1 according to the embodiment of FIG. 1 has a valve body 2 connected to an inlet flange 21 and an outlet flange 22 connected to piping. An actuator 5 is provided on the upper side. An opening adjuster 6 is arranged on the top of this actuator.

The valve body 2 is formed with an inlet passage 23 communicating with the inlet flange 21, an outlet passage 24 communicating with the outlet flange 22, and a valve seat 25 for controlling the flow of fluid by contacting and separating from the valve element. It is

The valve body 2 includes a branch pipe portion 26 extending obliquely upward. A valve body 43 having a contact member 44 is housed inside the branch pipe portion 26 . The valve body 43 is fixed to the stem tip portion 41 of the stem 4 . The branch pipe portion 26 has a projecting portion 27 on its upper portion. A bonnet 3 is provided having an externally threaded bonnet lower end 31 that connects with an internal thread cut into the inner surface of the projection 27 .

A gland packing 32, a washer 33, and a compression coil spring 34 are arranged on the bonnet 3 to prevent the fluid to be treated flowing through the valve from leaking to the outside. A male screw member 35 for applying pressure to the gland packing 32 from above is screwed into a bonnet upper end portion 36 on the upper portion of the bonnet 3 .

An actuator lower casing 51 is coupled to the bonnet upper end 36 by a screw connection. The upper part of the actuator lower casing 51 has a female thread on its inner surface, and the female screw and the lower actuator upper casing 52 having a male thread are screwed together. Joined by a connection. The actuator lower casing 51 and the actuator upper casing 52 form a casing and form an internal space 57 for housing the drive mechanism.

As a drive mechanism, a piston 53 integrated with the stem 4 via an O-ring 53b and a compression coil spring 54 arranged on the upper surface of the piston 53 and pressing the piston 53 downward are provided. The piston 53 has a through hole 53a through which the stem 4 penetrates in the center, and is supported by a stepped portion formed in the stem 4. As shown in FIG. In addition, the piston 53 is fixed so as to be restricted from upward movement by a wari ring inserted in a circumferential groove formed on the side surface of the split stem. The wari ring is prevented from coming off from the groove by fitting the C ring. The compression coil spring 54 has a double structure having a small diameter spring and a large diameter spring to increase strength. Airtightness is maintained between the piston 53 and the actuator lower casing 51 by an O-ring 53B.

A drive gas inlet/outlet 51a is formed in the actuator lower casing 51, and when the drive gas flows from here, it passes through the drive gas passage 51b, enters the internal space 57, and pushes the piston 53 upward. When the pressure of the driving gas is lowered, the piston 53 is lowered by the compression coil spring 54, and the driving gas passes through the driving gas passage 51b and flows out from the driving gas inlet/outlet port 51a.

A through hole 55a is formed in the top portion 55 of the actuator upper casing 52, and a cylindrical body 62 having an internal thread cut therein and an external thread 62a as shown in FIG. 2 is screwed. A female threaded member 56 having an internal thread 56a is fixed to the upper portion of the apex 55, and a male thread 62a is screwed together with the female thread 56a to stabilize the cylindrical body 62. As shown in FIG.

A sliding body 63 (see FIGS. 3 and 4), which is a main component of the present invention, is arranged at the stem upper end portion 42 at the upper end of the stem 4 . The sliding body 63 has a sliding body upper end portion 63a at its upper portion, and the sliding body upper end portion 63a forms a flange portion 63b that protrudes laterally like a flange. A slide body lower end portion 63d formed at the bottom of the slide body 63 has a slide body lower contact surface 63e formed on the lower surface thereof to contact the stem. The end surface of the sliding body lower contact surface 63e is a flat surface with burrs. The counterbore is to prevent the upper end of the stem 4 from coming off.

A collar portion accommodation space 62b for accommodating the collar portion 63b is formed in the lower portion of the cylindrical body 62, and a pin insertion hole 62d into which the pin 64 is inserted is formed. The pin 64 is preferably a spring pin to prevent falling off.

A sliding body upper contact surface 63c on the upper end surface of the sliding body upper end portion 63a is a convex surface. A spherical surface is preferred. The cylindrical body contact surface 62c with respect to the sliding body upper contact surface 63c is a flat surface, and in FIG. 4, the center is cut into a conical shape. Even if there is such a cut portion, there is no problem. Further, the cylindrical body contact surface 62c may not be flat, but may be a concave surface corresponding to the sliding body upper contact surface 63c.

By interposing such a sliding body 63 between the cylindrical body 62 and the stem 4, transmission of the frictional force due to the rotation of the cylindrical body 62 to the stem 4 is reduced, and the rotational force is transmitted to the stem 4. is reduced, and it is possible to prevent the stem 4 from co-rotating.

A notch portion 62 d is formed in the upper portion of the cylindrical body 62 by cutting out two surfaces for turning the cylindrical body 62 . Stainless steel is preferable for the material of the cylindrical body 62 and the stem 4, and SUS316L material is particularly preferable. The sliding member 63 is preferably made of a material having higher hardness than these stainless steels, and particularly preferably a duplex stainless steel having a metal structure in which the ferrite phase and the austenite phase are approximately 1:1.

ADVANTAGE OF THE INVENTION The valve by this invention can adjust the flow rate at the time of a valve|bulb fully opening, without damaging a valve|bulb, while flowing a fluid by a valve|bulb fully open state.

1: Valve 2: Valve Body 3: Bonnet 4: Stem 5: Actuator 6: Opening Adjuster 21: Inlet Flange 22: Outlet Flange 23: Inlet Passage 24: Outlet Passage 25: Valve Seat 26: Branch Pipe Portion 27: Projection Portion 31: Bonnet lower end 32: Gland packing 33: Washer 34: Compression coil spring 35: Male screw member 36: Bonnet upper end 41: Stem tip 42: Stem upper end 43: Valve body 44: Contact member 51: Actuator lower casing 51a: Drive gas inlet/outlet 51b: Drive gas passage 52: Actuator upper casing 53: Piston 53a: Through hole 53b: O-ring 54: Compression coil spring 55: Top 55a: Through hole 56: Female screw member 56a: Female screw 57: Internal space 62: Cylindrical body 62a: male thread 62b: flange accommodating space 62c: cylindrical body contact surface 62d: notch 62e: pin insertion hole 63: sliding body 63a: sliding body upper end 63b: flange 63c: sliding body upper contact surface 63d: lower end portion of sliding body 63e: lower contact surface of sliding body 64: pin

Claims (4)

a valve body having a flow path;
a valve body that opens and closes the channel;
a stem that rises or falls to move the valve body in the opening or closing direction;
an actuator for moving the stem up and down,
The actuator has a casing with an internal space in which a drive mechanism is arranged, and an opening adjuster is provided at the top of the casing,
The opening adjuster comprises a columnar or cylindrical body having a male thread formed on its outer periphery, and a sliding member interposed between the columnar or cylindrical body and the stem,
The male thread is screwed with a female thread formed in the top portion of the casing and connected to the internal space, and the lower end portion of the columnar or cylindrical body , the upper end portion of the sliding member , and the upper end portion of the stem and the sliding member. A valve characterized in that the lower end of the moving body abuts when the valve is fully opened. 2. The valve according to claim 1, wherein one of the abutment surfaces of the upper end portion of the sliding body and the lower end portion of the cylindrical body is a convex surface, and the other is a flat surface or a concave shape corresponding to the convex surface. A valve that is a face. 3. The valve according to claim 1, wherein the sliding body has a flange at its upper end, and the columnar or cylindrical body has a flange accommodating space at its lower end for accommodating the flange. A valve in which a pin insertion hole is formed from a side surface so as to intersect with a flange accommodating space, and the flange is supported by a pin inserted into the pin insertion hole. 4. The valve according to any one of claims 1 to 3, wherein a piston is provided integrally with the stem in the internal space and is raised by introduction of a driving fluid, and the piston is pressed downward. A valve provided with a compression coil spring provided.

Images