JPS6113818Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a water stop valve using a ball.

BACKGROUND ART Conventionally, ball water stop valves have been made of an elastic material such as rubber for the valve seat. In the conventional example shown in FIG. 3, a indicates a water stop state and b indicates a water flow state, in which the ball 1 is pressed laterally against the elastic force of the return spring 11 by some pressing means during water flow. The pressing pin 12 returns when the water is stopped, and the ball 1 contacts the valve seat 4 due to water pressure, closing the valve port 14. However, in order for the ball to quickly close the flow path, a certain hydraulic pressure is applied. The ball resonates when
As shown in C, as the ball 1 repeats vertical vibration while rotating in the direction of the arrow, the ball 1 and the valve seat 4
A gap is created between the two, and as long as the resonance continues, the water will not stop.

To prevent this, if a soft elastic material is used to reduce the spring constant of the valve seat, when the impact force on the ball is large, the elastic limit of the valve seat will be exceeded and the ball will receive a reaction force from the bottom of the step. Therefore, there is a disadvantage that the spring constant becomes larger. The present invention has been provided to solve these problems.

Figures 2a and 2b show various embodiments of the present invention, in which an annular valve seat 4 made of an elastic material is fitted into a step 3 formed on the periphery of the valve port 2, and the lower surface of the valve seat 4 is A V-shaped recess 5 is formed between the lower surface of the valve seat 4 and the stepped portion 3 by tapering the inner peripheral portion, and a thin wall portion protrudes inwardly and upwardly from the inner peripheral edge of the upper surface of the valve seat 4. 6 was formed. A is an example in which the thin wall portion 6 is provided to protrude inwardly, and b is an example in which the thin wall portion 6 is made to protrude upward by forming an annular groove 7 slightly outside the inner edge of the upper surface of the valve seat 4. It is something.

Fig. 1 shows the present invention applied to a water stop valve with a timer, in which the rotation of an impeller 8 that rotates in proportion to the amount of water flowing is transmitted to a cam plate 10 via a reduction gear train 9, and a return spring 11 When the biased ejector pin 12 falls into the notch 13 of the cam plate 10, the ball 1, which had been pressed laterally by the ejector pin 12, becomes free and engages with the valve seat 4 due to water pressure, opening the valve opening. 2 is becoming obstructed. 14 is a time setting knob, and 15 is an O-ring. Note that 16 is a groove for escape when the valve seat 4 is bent downward.

The present invention is constructed as described above, and when the water pressure is low, only the thin wall part bends, and when the water pressure increases, the valve seat bends, and when the water pressure increases further, the lower tapered part of the valve seat bends to the bottom of the stepped part. By being in close contact with the valve seat itself and elastically deforming, it can respond to a wide range of changes in water pressure, and the weak spring constant prevents ball resonance and water hammer effects that tend to occur at low water pressure. There are advantages to getting it.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a timer-equipped water stop valve showing an embodiment of the present invention, Fig. 2 a is a cross-sectional view of the same essential parts, and b
3 is a sectional view of a main part of another embodiment, and FIGS. 3a, 3b, and 3c are sectional views of main parts showing operating states of a conventional example. 1 is the ball, 2 is the valve port, 3 is the step, 4 is the valve seat,
5 is a concave portion, and 6 is a thin wall portion.

Claims (1)

[Scope of utility model registration request] In a water stop valve using a ball, an annular valve seat made of an elastic material is fitted into a step formed on the periphery of the valve opening, and the inner circumference of the lower surface of the valve seat is tapered to form a cutout. A water stop valve comprising a V-shaped recess formed between the bottom surface of the stepped portion and a thin wall portion protruding inwardly and upwardly on the inner peripheral edge of the upper surface of the valve seat.