JPS6159070A - Valve with soft valve seat - Google Patents

Abstract

PURPOSE:To eliminate deformation in folding by providing a step difference on a portion of the opposite side of the folding inside a groove by lowering a side wall of the folding side a little than the lower face of a valve and projecting a valve seat a little from the lower face of the valve. CONSTITUTION:A tip of external circumference of a side wall 3B of a groove 3A cut on a valve 3 is lowered by the dimension H1 than the lower face 3c of the valve and a step difference 3d is provided on the opposite side of the side wall 3B. In caulking work, a valve seat upper direction with a load W, then a contact face 4A of the valve seat is bent in the bore direction by contacting of a step difference 11A of a caulking ring 11 and the side wall 3B while keeping plainness on the upper face 12A of a caulking table 12. The valve seat mounted in this way can lighten retaining of proper clamping force and stress concentration in a rubber seat.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve in which a soft valve seat, particularly a valve seat made of rubber or soft and highly elastic synthetic resin, is attached to a valve body.

Rubber or the like is widely used for the valve seat of pulp, and the method for installing it is as shown in FIG. It was screwed on.

In this case, since there are many parts and the cost is high, the valve seat 4 is made smaller as shown in FIG. 2, and the side wall 3B of the groove 3A carved in the valve body 6 is bent from the outside. There is a way to fix it. With this method, when using a relatively hard valve seat such as Teflon, Duracon, or nylon, the deformation of the valve seat 4 after bending the side wall 3B is limited to only the bent portion, and the deformation of the valve seat contact surface 4A is minimized. There was no time.

However, in order to improve the performance of reliably preventing leakage even if there is some dirt, it is necessary to use a material such as rubber with relatively low hardness for this valve seat. Therefore, use a second valve seat made of rubber, etc.
When installed in the manner shown in the figure, the force of the side wall 3B biting into the valve seat 4 deforms the valve seat 4 into a morning glory shape as shown in Figure 3, and the valve seat contact surface 4A slopes, making it impractical. There wasn't.

Even if the valve seat contact surface 4A was machined to suppress deformation by reducing bending, the deformation progressed due to heating and cooling during use and repeated opening and closing, and the phenomenon still occurred that the valve seat deformed into a morning glory shape.

Furthermore, the shape shown in FIG.
Since the lower surfaces of the valve body 6 are in agreement with each other, when the valve body 6 is used repeatedly, stress will be concentrated in the portion 4B of the valve seat 4.
A break occurred.

The present invention eliminates these drawbacks and provides a valve with a soft valve seat that eliminates deformation during bending and at the same time reduces damage to the valve seat made of rubber or the like even when opened and closed repeatedly. □Examples will be described below.

FIG. 5 shows the shape of the valve body 3 before the valve seat is installed in this embodiment, and shows the side 93 of the groove 3A carved in the valve body 3.
The tip of the outer periphery of B is lower than the lower surface 3C of the valve body by a dimension Hl, and a step 3d is provided on the opposite side of the side wall 3B. The relative position of the step 6d is such that the H2 dimension is lower than that of the side wall 3B.

In the radial direction, a caulking jig shown in FIG. 6 is used to attach the valve seat 4 to the valve body 6 with the inner diameter of the disk adjusted to d+ in this structure. In FIG. 6, reference numeral 11 is a caulking ring having a step 11A inside, and 12 is a crimping ring which is screwed into the step 11A and H37! This is a crimping pedestal that can adjust the dimension of The valve seat contact surface 4A is kept flat on the upper surface 12A of the caulking pedestal 12, and the step 11A of the caulking ring 11 and the side wall 3B come into contact and are bent in the inner diameter direction.

As shown in FIG. The deformation dimension is regulated by H4, and the elasticity of the rubber etc. is distributed over a volume of 115 dimensions to maintain an appropriate tightening force and relieve stress concentration inside the rubber sheet.

Due to the above structure, the valve seat will not deform after installation, but will not deform even under high temperatures, temperatures of 100F, or repeated use, and the valve seat will always have a stable pressing force and a soft valve. The valve seat has been completed with no leakage at all. Although the above embodiments are illustrated using check valves, it goes without saying that a globe valve or an angle valve would have the same effect. Furthermore, as shown in FIG. 8, the effect is the same even if the inner diameter is caulked or both the inner diameter and the outer diameter are caulked on both sides (not shown).

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing conventional embodiments, Figure 6 is a cross-sectional view showing deformation after installing a conventional rubber valve seat, etc., and Figure 4 is a cross-sectional view showing the stress of a conventional rubber valve seat. Sectional view showing the inside, No. 5
The figure is a cross-sectional view of the valve seat according to the present embodiment before installation. Figure 6 is a cross-sectional view of the valve caulking jig of the present example. Figure 7 is a cross-sectional view after the valve seat is installed according to the present example. Figure 8. 1 is a cross-sectional view of this embodiment provided on the radially inner side of the valve body. 3: Valve body, 6C: Lower surface of valve body, 3A: Groove 3d: Step, 6B = Side wall, 4: Valve seat 2nd side, 3rd figure, 4 @ Figure 5, Figure 6

Claims (1)

[Claims] The valve seat is characterized by providing a step on the opposite side of the bend inside the groove provided on the lower surface of the valve body, making the side wall on the bent side slightly lower than the lower surface of the valve body, and making the valve seat slightly protrude from the lower surface of the valve body. valve with a soft valve seat.