JPS62459Y2 - - Google Patents

Description

[Detailed description of the invention] This invention maintains the pressure in the system within a certain range, and when the pressure in the system reaches a predetermined value or higher, the pressure liquid is released from the spillway.
A pressure liquid source, such as a pump, is in no-load operation,
This invention relates to an unload valve designed to save power.

That is, this invention includes a body having a primary port, a secondary port, and a passage that communicates these ports, and a valve body that sits from the opposite side of the passage with respect to a valve seat formed facing the passage. , a pressure regulating means for adjusting the elastic force that presses the valve body against the valve seat, and a piston valve provided on a portion of the valve stem extending from the valve body toward the secondary port side, An unload valve that separates the valve body from the valve seat via a piston valve to which this pressure acts when the pressure rises to a predetermined value or more, and guides the primary side pressure liquid to the spill port through the valve body. The check valve is closed when, for example, a nozzle communicating with the secondary port is closed at the end of use,
The piston that forms this check valve separates the valve body from the valve seat via the valve stem, and the pressure liquid sent from the pump is discharged from the spillway, resulting in excessive pressure in the system. This has the effect of eliminating all kinds of inconvenient situations.

Next, this idea will be explained with reference to the drawings.

In the figure, 1 is a body, and this body 1
A passage 4 is formed in which the inlet port 2 and the outlet port 3 communicate with each other.

The passage 4 of the valve stem 7 is formed in a skewer shape with respect to the valve seat 5 formed facing the passage 4, and a conical valve body 6 seated from the opposite side of the passage 4.
The end of the portion 7a on the opposite side is fitted into a recess 9 formed in the seat plate 8, and the seat plate 8 and the valve body 6 slide within a cover body 11 that is connected to the body 1 with bolts 10. A spring 12 as an elastic means is compressed between the seat plate 8 and the end face of a pressure regulating bolt 13 screwed into the cover body 11 from the outside is engaged. This is determined by screwing in the fixing bolt 14 until it touches the end surface of the cover body 11. Incidentally, a spillage port 15 is opened at a suitable position in this cover body 11.

A piston 16 and a check valve 17 are fixed to the portion 7b of the valve rod 7 on the side of the passage 4.
A piston valve 19 having a spring 18 and a spring 18 is provided, and the action of this piston valve 19 is
When the pressure liquid flows from the piston 16, this liquid passes through the internal port 20 of the piston 16, pushes the check valve 17 open against the force of the spring 18, and flows from the secondary port 3 to a predetermined end of use, such as a nozzle 21. When the nozzle 21 is closed, the pressure on the secondary side rises and exceeds a predetermined value, the check valve 17 is closed, and the conical valve body 6 and the piston 16 of the piston valve 19 are closed. Due to the area difference, the entire piston rod 7 is pushed and moved, and the valve body 6 is separated from the valve seat 5, and the pressure liquid supplied from the pressure liquid source, that is, the pump 22 into the passage 4 through the primary port 2, is pumped. Valve body 6
The water is discharged from the spillway port 15, and the pump 22 enters a no-load operating state.

Note that when the nozzle 21 is opened again at the end of use, the pressure on the secondary side decreases, so the piston valve 1
At 9, the piston 16 is moved in the opposite direction to that described above, the valve body 6 is pressed against the valve seat 5, and the pressurized liquid is passed through the check valve 17 to the secondary side.

[Brief explanation of the drawing]

Figure 1 is a sectional view of one embodiment of this invention;
The figure is a view taken in the direction of arrow A in FIG. In the figure, 1...body, 2...inlet side port (primary side port), 3...outlet side port (secondary side port), 4...passage, 5...valve seat, 6...
... Valve body, 7... Valve stem, 11... Cover body, 12...
... Spring, 13 ... Pressure regulating bolt (pressure regulating means), 15
...Leftwater port, 19...Piston valve, 21...Nozzle, 22...Pump (pressure liquid source).

Claims (1)

[Scope of utility model registration request] A body having a primary port, a secondary port, and a passage that communicates these ports, a valve body that sits from the opposite side of the passage with respect to a valve seat formed facing the passage, and the valve body. and a piston valve provided on a portion of the valve stem extending from the valve body toward the secondary side port, and the piston valve includes a piston and a A check valve is provided, and when pressure liquid flows from the primary port, the liquid passes through the internal port of the piston and pushes the check valve open to reach the secondary port, so that the secondary pressure is reduced. When the pressure exceeds the value set by the pressure regulating means, the check valve closes and the piston slides to separate the valve body from the valve seat, allowing the primary pressure liquid to flow through the valve body and into the spill outlet. An unload valve that guides the