JPS6131240Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pressure regulating valve that utilizes a bypass passage to bleed air during the initial operation of the pump and to perform no-load switching of the main pressure regulating valve.

Conventionally, as shown in FIG. 1, this type of pressure regulating valve communicates a portion where a pressure regulating main valve b that biases the elastic force of a spring a with an inlet side c through a bypass passage d. Ball Kotsuku e in passage d
By opening this ball socket e using the operation handle f, it is possible to perform initial air bleeding during pump operation and switching during no-load operation. In order to use the pump, it is necessary to make the ball valve e larger, which makes the sealing part more difficult.In the end, when the air is removed during pump operation and during no-load switching, the pressure regulating main valve b is directly controlled by the elasticity of spring a. I had to push myself up against the force.

This idea was designed to solve the above problem, and instead of pushing up the main pressure regulating valve against the spring, it only operates the piston-shaped auxiliary valve located in the bypass passage. An object of the present invention is to provide a pressure regulating valve which is capable of performing air bleeding during the initial operation of the pump and switching the pressure regulating main valve under no load, and which is compact and has improved sealing performance. It is.

Embodiments of this invention will be described below with reference to FIGS. 2 to 4.

In the figure, reference numeral 1 denotes a pressure regulating valve body, with an inlet 2 and an outlet 3 communicated by a passage 4, and a main pressure regulating valve 7 is seated in this passage 4 by biasing the elastic force of a disc spring 6 toward a valve seat 5 disposed on the inlet 2 side. In this case, the disc spring 6 is housed in a spring case 8 mounted above the pressure regulating valve body 1, and the regulating pressure is adjusted by an adjustment screw 9 screwed into the top of the spring case 8. The pressure regulating valve body 1 is also provided with a bypass passage 10 that communicates between the inlet 2 side and the portion where the main pressure regulating valve 7 is located, and this bypass passage 1
In the piston-shaped auxiliary valve 11, a piston-shaped auxiliary valve 11 is arranged so as to be slidable in the horizontal direction.
The auxiliary valve 11 is seated on a valve seat 14 in the bypass passage 10 by the elastic force of a spring 13, which is a resilient means provided between the auxiliary valve 11 and a valve guard 12 attached to the inlet side of the bypass passage 10, and a push rod 11 abuts against and engages with the outlet side of the auxiliary valve 11.
5 comes into contact with and engages with the cam portion 17 of the operating lever 16,
By operating the operating lever 16, the push rod 15 resists the elastic force of the spring 13 to open the auxiliary valve 11, or conversely, the elastic force of the spring 13 brings the auxiliary valve 11 into a closed state.

In the pressure regulating valve of this invention constructed as described above, by operating the operating lever 16 upward as shown by the imaginary line in FIG. 2, the cam portion 17 is displaced along with the operating lever 16. push rod 15
to the left in the figure, and at the same time open the auxiliary valve 1.
When the bypass passage 10 is opened by resisting the elastic force of the spring 13, the fluid from the inlet 2 flows out through the bypass passage 10 and from the outlet 3. Therefore, by opening the auxiliary valve 11, air can be removed during initial pump operation and no-load switching can be performed, and by closing the auxiliary valve 11, the pressure can be adjusted by the main pressure regulating valve 7. In addition, since the auxiliary valve 11 is pressed by the pressure of the fluid from the inlet 2 side, the sealing performance can be improved.

As explained above, according to the pressure regulating valve of this invention, by opening and closing the piston-shaped auxiliary valve using the operating lever, air can be removed during initial operation of the pump and switching between no-load state and loaded state can be performed. It is easy to perform, and has excellent effects such as improving the sealing performance of the auxiliary valve by using the internal pressure of the fluid under load. Since it can be made more compact compared to other devices, its utility value is remarkable.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional pressure regulating valve, Fig. 2 is a front longitudinal sectional view of the pressure regulating valve of this invention, Fig. 3 is a left side view showing half of it in cross section, and Fig. 4 shows the main parts. FIG. In the figure, 1...pressure regulating valve body, 2...inlet,
3...Outlet, 4...Passage, 5...Valve seat, 6...Dish-shaped spring, 7...Pressure regulating main valve, 10...Bypass passage, 11...Piston-shaped auxiliary valve, 12...Valve holder , 13... spring (elastic means), 14...
... Valve seat, 15 ... Push rod, 16 ... Operation lever,
17...cam section.

Claims (1)

[Scope of utility model registration request] A pressure regulating valve comprising a main valve that is seated by elastic force on a valve seat disposed on the inlet side in a passage communicating between an inlet and an outlet, wherein the inlet side and the main valve are located. A piston-shaped auxiliary valve is interposed that communicates with the site via a bypass passage and closes the bypass passage by applying a resilient force of an elastic means from the inlet side of the bypass passage, and the auxiliary valve A pressure regulating valve comprising a lever that engages with the elastic means to open the bypass passage against the elastic means.