JPH0334292Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a new structure of a pressure regulating valve for the purpose of eliminating air suction troubles during pressurized operation in a power sprayer.

When the pressure regulating valve of a power sprayer is pressurized, if the water intake port comes out of the water for some reason and sucks air from there, air will accumulate in the discharge valve chamber, and when the water intake port is put back into the water, the water supply will stop. The liquid stops flowing. At this time, raise the release lever of the pressure regulating valve to weaken the pressing force of the bellows 9 to make it easier for the valve body to separate from the valve seat, and after sucking and passing air, lower the release lever to restore the pressing force of the bellows 9. was common. The present invention eliminates the need for such operations, and its structural feature lies in the fact that a communicating small hole is formed in the pressure regulating valve provided between the discharge valve chamber and the spillage chamber.

The present invention will be explained in detail below with reference to the drawings.

Figure 1 is a partially cutaway side view of the pressure regulating valve;
The figure is a bottom end view of the same. FIG. 3 is a partial longitudinal sectional view of a power sprayer equipped with a synchronized pressure valve.

The power sprayer is equipped with a suction valve 2 and an inlet 3 at the front of a cylinder 1, and a discharge valve chamber 5 equipped with a discharge valve 4 and its discharge port 6 at the upper part. A pressure regulating valve 7 is provided so as to be located above the discharge valve chamber 5, and is provided with a surplus water chamber 8. A pressure regulating valve 7 is provided between the surplus water chamber 8 and the discharge valve chamber 5. The pressure regulating valve 7 consists of a valve body 10 and a valve seat 11 serving as a valve seat, and the valve body 10 is elastically supported by a bellows 9 and further pressed by a spring (not shown). A gap is created between the valve body 10 and the valve seat at a location appropriate for the flow rate and pressure, the pressure is regulated to the set pressure, and the surplus water flows to the surplus water port 12.

In the present invention, a communicating small hole 13 is formed in the pressure regulating valve of the power sprayer having the above structure. A communicating small hole 13 is provided in the valve seat 11. The communication small hole 13 may be provided in the valve body 10, in the partition wall between the discharge valve chamber 5 and the residual water chamber 8, or by providing a groove in the hole in the valve seat 11 instead. However, it is most preferable to provide the valve seat 11 in this manner.
In this case, if the communication small hole 13 is a tapered hole that opens from the discharge valve chamber 5 side to the spillage chamber 8 side, it will not be easily clogged. The optimum hole diameter of the communicating small hole 13 varies depending on the size of the pump and the flow rate of the liquid, but is approximately 0.3 mm to 3 mm, preferably 0.5 to 2 mm. If it is smaller than 0.3 mm, the pressure drop will be small, but the hole will be easily clogged, the water absorption time will be longer, and the original purpose cannot be achieved. Moreover, if it exceeds 3 mm, the hole will not be clogged and the water suction time will be shortened, but the pressure drop will become large and the efficiency of the pump will decrease.

The pressure regulating valve of the power sprayer of the present invention has the above structure, so even if it stops in a pressurized state, the suction air is quickly discharged and the water is absorbed and sprayed without reducing the pressure in the pressurized state. It is possible to continue and
The effect of eliminating the need to operate the release lever during startup was achieved without reducing pump efficiency.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of the pressure regulating valve;
The figure is a bottom end view of the same. FIG. 3 is a partial longitudinal sectional view of a power sprayer equipped with a synchronized pressure valve. 1... Cylinder, 2... Suction valve, 3... Inlet, 4... Discharge valve, 5... Discharge valve chamber, 6... Discharge port, 7... Pressure regulating valve, 8... Surplus water chamber, 9 ... Bellows, 10 ... Valve body, 11 ... Valve seat, 12
...Spill water outlet, 13...Communicating small hole.

Claims (1)

[Claims for Utility Model Registration] 1. A pressure regulating valve for a power sprayer, characterized in that a communicating small hole 13 is formed between a discharge valve chamber 5 and a residual water chamber 8 of the power sprayer. 2. The pressure regulating valve for a power sprayer according to claim 1, wherein the communicating small hole is formed in the valve seat 11 which serves as the valve seat. 3. The pressure regulating valve for a power sprayer according to claim 1 or 2, wherein the communicating small hole is a tapered hole that opens from the discharge valve chamber side to the spillage chamber side.