JPH0545330U - Valve seat - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the torque on the valve body of the valve seat that is in sliding contact with the valve body of steel valves and spherical valves, and to prevent dust from being trapped. [Structure] The rubber ring 9 that is in sliding contact with the valve body is formed of a mixture of ultra-high nitrile rubber and tetrafluoroethylene resin powder, which reduces the occurrence of resistance in the sliding contact portion with respect to the valve body and ensures sealing performance. A wiper-shaped protrusion 11 provided at the end of the rubber ring 9 prevents dust from being caught between the rubber ring 9 and the valve body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve seat, and more particularly to a valve seat with which a valve element such as a steel valve or a spherical valve is in sliding contact.

[0002]

[Prior Art]

 In steel valves and spherical valves, the valve body is rotatably housed inside the valve case, and the valve seat of the ring that slidably contacts the valve body is provided at the inner end of the liquid passage formed in the valve case facing the valve body. When the valve seat is attached and the valve is closed, the valve seat is required to have close contact with the valve seat in order to obtain a reliable sealing property. It will slide on the valve seat during rotation.

As a conventional valve seat, a rubber seat in which rubber is molded into a ring shape is used in order to secure the sealing property of the valve body.

[0004]

[Problems to be solved by the device]

 However, the conventional rubber sheet has a good adhesion to the valve body and an excellent sealing effect, but on the other hand, it has a large friction coefficient and requires a large torque when opening and closing the valve body. Therefore, there is a problem to further increase the opening / closing torque.

Further, in the conventional soft rubber sheet, in order to prevent the soft rubber sheet from being inserted into the valve body when the valve body is opened and closed, it is general that the end of the contact surface with the valve body is rounded. , If the end is rounded, the foreign matter adhering to the valve disc will not be effectively removed, and a tapered gap will be created on the contact surface with the valve disc, and dust will be caught in this gap when opening and closing the valve disc. In some cases, causing a seat leak.

Therefore, the present invention is a valve that has an excellent sealing effect, can reduce the torque when the valve body is opened and closed, and can prevent the occurrence of entrainment, and further, can remove dust and prevent the occurrence of trapping. The challenge is to provide seats.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is to fix a rubber ring made of a mixture of ultra-high nitrile rubber and tetrafluoroethylene resin powder onto a metal ring by baking, and fix it to the end of the rubber ring with a wiper-shaped member. It adopts the configuration with the protrusions.

[0008]

[Action]

 Since the rubber ring with which the valve body slides is made of a mixture of ultra-high nitrile rubber and tetrafluoroethylene resin powder, it is possible to reduce the torque with the tetrafluoroethylene resin while maintaining the sealing performance with the rubber. The valve body can be opened and closed smoothly, and the tensile strength of the rubber material is high, so no entrapment occurs during opening and closing.

Further, the protrusions provided on the rubber ring scavenge the dust adhering to the surface of the valve body, prevent the dust from being caught in the valve body, and prevent the seat leakage.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 exemplifies a steel valve as a valve using a valve seat, in which a cylindrical body 2 is contracted in a valve case 1 so as to be horizontally rotatable, and a circular surface is formed on a ring surface of the cylindrical body 2. A valve body 4, which is plate-shaped and has an outer peripheral portion formed on a spherical surface 3 centered on the rotation axis of the cylindrical body 2, is elastically mounted, and is ring-shaped inside the valve case 1 on the inner end side of the fluid passage 5. The seat washer 6 is fixed and the valve seat 7 with which the spherical surface 3 of the valve body 4 is in sliding contact is attached to the washer 6.

As shown in FIGS. 2 and 3, the valve seat 7 includes a metal ring 8 and a rubber ring 9 which is fixed by baking from the inner peripheral surface of the metal ring 8 to the front surface thereof. It is made of a mixture of ultra-high nitrile rubber and ethylene tetrafluoride resin powder, and has an L-shaped cross-sectional shape that overlaps the inner peripheral surface of the metal ring 8 and the front surface. It is an inclined surface 10 that contacts.

The rubber ring 9 has a wiper-shaped acute-angled projection 11 connected to the end of the inclined surface 10, and foreign matter adhering to the surface of the valve body 4 is wiped off by the projection 11 to open and close the valve body 4. Foreign matter is prevented from being caught between the valve body 4 and the rubber ring 9 during operation.

The protrusions 11 provided on the rubber ring 9 are not only on the front end side of the inclined surface 10 as shown in FIGS. 2 and 3a, but also on the front and rear ends (FIG. 3b) of the inclined surface 10 and the rear end side of the inclined surface 10. (FIG. 3c).

Further, when the valve seat 7 in FIG. 1 is assembled, the valve seat 1 is contracted so as to be freely movable in the axial direction between the seat washer 6 and the metal seat 12 arranged inside the washer 6. An example is shown in which the valve body 4 can be brought into pressure contact with the fluid pressure applied to the back side from the outside.

The valve seat of the present invention has the above-mentioned structure, and when the valve body 4 is in the valve closing position, the spherical surface 3 thereof is pressed against the inclined surface 10 of the rubber ring 9 as shown in FIG. When the valve body 4 is opened and closed while the valve is sealed, the spherical surface 3 of the rotating valve body 4 slides on the rubber ring 9.

Since the rubber ring 9 is made of a mixture of ultra-high nitrile rubber and ethylene tetrafluoride resin powder, it has excellent dust resistance, and the rubber material provides a sealing effect, and the ethylene tetrafluoride The resin powder reduces the coefficient of friction with the valve body 4, and the valve body 4 can be opened and closed with low torque.

Further, due to the reduction of the friction coefficient of the rubber ring 9, the rubber ring 9 is not caught when the valve body 4 is opened and closed, and the projection 11 provided at the end is attached to the outer surface of the valve body 4. A wiper effect that removes dust can be exerted, thereby preventing dust from being caught in the valve body 4 and seat leakage.

[0019]

【effect】

 As described above, according to the present invention, the rubber ring baked on the metal ring is made of the mixture of ultra-high nitrile rubber and ethylene tetrafluoride resin powder, so that the valve body is maintained while maintaining the sealing effect on the valve body. It is possible to reduce the torque when opening and closing.

Further, since the ultra-high nitrile rubber having a high tensile strength is used, the torque is reduced so that no entrapment occurs when the valve body is opened and closed, and the dust resistance is improved.

Further, since the wiper-like protrusion is provided at the end of the rubber ring, the dust attached to the valve body can be removed by the protrusion, and dust is not caught between the valve body and the seal. It is possible to prevent air leaks.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing a usage state of a valve seat according to the present invention.

FIG. 2 is a perspective view of a valve seat.

3A to 3C are enlarged sectional views showing different examples of protrusions of a valve seat.

[Explanation of symbols]

 7 Valve seat 8 Metal ring 9 Rubber ring 10 Inclined surface 11 Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Togame 2-3-11 Sellohori, Nishi-ku, Osaka City

Claims (1)

[Scope of utility model registration request] 1. A valve seat in which a rubber ring made of a mixture of ultra-high nitrile rubber and ethylene tetrafluoride resin powder is baked and fixed on a metal ring, and a wiper-like protrusion is provided at an end of the rubber ring.