FI67611B - MEDIA TAILORED FUELS FOR TRAILERS - Google Patents

Description

1 67611

This invention relates to a pressure-controlled time-controlled shut-off valve for tap water of the type set out in the preamble of claim 1.

Such time-adjustable shut-off valves are known, for example, from German patent publication 264980 and Finnish patent application 780453. In both of these solutions, the same principle solution is used. The water directed from the inlet line to the outlet line is made to flow in such a way that the sealing part closing the channel is lifted out of place as the piston connected to the seal moves upwards in its chamber, as the water-filled chamber above the piston is emptied. In both cases, this is done by opening the drain valve in the wall of the chamber. In addition, both solutions use a pressure member that opens the outlet valve. Finnish patent application 780453 also uses a separate screw-like member, by means of which it is possible to adjust the water flow time, i.e. the height to which the piston can rise in its chamber.

However, both solutions have certain drawbacks. Thus, the operation of the valves is vague, especially when the tap water pressure is very low. This is because the valves can remain in an intermediate space where they do not open properly or close. In addition, the flow of water flowing through them is uneven, depending on the position of the valve, with a fully open position resulting in a strong flow and a position where the valve is almost closed results in only a very low flow. If you want to restart the valve when it is about halfway closed, for example, 6761 1 2 nothing happens. Namely, the valve continues to complete its cycle and only starts it after it has released new water.

The object of the present invention is to avoid the disadvantages of the prior art and to provide a valve structure which also operates at a low pressure in the water supply network and then operates as accurately as at a higher pressure. In addition, with the valve according to the invention, a constant flow is achieved in all positions of the valve, and also the re-triggering of the valve during the filling phase always starts reliably from the beginning of the time adjustment. Another advantage of the valve according to the invention is that changing the time adjustment to another value is a very quick and easy operation.

The above-mentioned advantages are achieved by means of the characteristic features set out in the appended claims.

The invention will be explained in more detail below with reference to the accompanying drawing, which shows a valve according to the invention in vertical section.

Since most of the parts of the valve according to the invention are quite conventional in the art, the parts will now be reviewed almost in a list. The valve is triggered by a pushbutton 1 fixed to the body by a screw 3. The screw 3 is hidden, for example, under a cover plate made of plastic or a protective plug 2, which plug is a solution conventionally used in water taps. After pressing, the pushbutton 1 returns to its initial position by the spring 5. When the pushbutton is pressed downwards, it also pushes the discharge valve member 6 downwards, whereby the seal 8 leaves to close the outlet and the chamber 23 begins to empty through the channels 9 and 10. When the pushbutton 1 rises to its upper position, the valve member 6 also returns to its upper position by closing the outlet channel by means of a spring 7.

3,67611

Instead of making the valve body from a single piece, according to the invention it is assembled from several body pieces, denoted in the drawing by the numbers 11, 12, 13 and 19. Seals, usually O-rings, have been used for the seals between the body pieces. In addition, the valve according to the invention comprises a valve member 14 which extends at its upper end into the chamber 23, forming a piston part 24. Just as in the prior art solutions, this valve also has a needle-like member 21 projecting into the channel 20, which keeps the chamber 23 clean. In addition, the valve includes a seal 15 closing the water inlet 17, which is supported by a support plate 22. From the inlet 17, water leaves the outlet 18.

As usual, pressing the push button 1 causes the discharge valve member 6 to be depressed and the discharge opening to open, whereby the chamber 23 is emptied and the valve member 14 rises under the action of the water pressure in the inlet channel 17. The chamber 23 is emptied along the channel between the annular channel 9 and the slit channel 10 and further between the neck of the valve member 14 and the valve body 13 into the outlet channel 18. The chamber 23 in turn fills the path passing from the inlet channel 17 through the bore 20 along the channel to the chamber 23. When the chamber 23 is full, the valve member 14 has returned to its initial position and closed the inlet channel 17.

Another advantageous feature of the invention is the ease of adjusting the water flow time. This is done by inserting a screw 4 inside the fastening screw 3, by means of which the adjustment is carried out simply by turning the screw 4 in the desired direction by means of a screwdriver. Turning the screw 4 adjusts the rise height of the valve member 15. If the screw 4 is set to the lowest possible position, the chamber 23 is not completely emptied, but in a small part, whereby the flow time of the water is short. Correspondingly, adjusting the screw to the up position results in an extended water flow time.

According to the invention, the water inlet channel 17 is choked. In this case, the choke is formed by a screw head, the screw having a seal 15 and its support plate 22 attached to the lower end of the valve member 14. Since the choke is always on, the pressure acting on the inlet line 17 acts quite strongly through the choke on the valve member. This provides fast and accurate operation of the valve brick member even at low water line pressure. In addition, the throttle allows the piston to rise to start timing from the beginning if the valve is triggered during the filling phase.

Thanks to the throttle, the water flow remains completely constant throughout the flow and, for example, it does not surge with different intensity and volume depending on the position of the valve member. In addition, the throttle screw 16 causes a slight decrease in pressure, so that the discharge line 18 is always subjected to a slightly lower pressure than the inlet line, for which reason the chamber 23 empties safely and quickly. Overall, the valve works properly regardless of external factors.

Although the invention has been described above with reference to only one embodiment of a valve according to the invention, which is obviously a preferred embodiment, neither the drawing nor the description is to be construed as limiting, as it is obvious to a person skilled in the art to modify the structure of the valve according to the invention without departing from the claims. the scope of protection defined by the

Claims (4)

6761 1 A pressure-controlled time-controlled shut-off valve for a water mains, having a valve housing (11, 12), a valve member (14) arranged axially movable in the housing, a water flow-closing, opening-sealing part (15) and a piston part (24) sealing relative to the housing , wherein the valve transducer has a through passage (20) for conducting water to a chamber (23) remote from the sealing part delimited by the piston part, which in turn has a discharge valve (6, 8) and downstream passages (9, 10) for conducting water from the chamber (23) to the outlet passage (18), the valve (6, 8) being operated, for example by means of a spring-loaded pushbutton (1), characterized in that the inlet channel (17) is provided with a throttle (16). Valve according to Claim 1, characterized in that the choke (16) is the base of a screw which presses between the sealing part (15) and its support plate (22). A valve according to claim 1, characterized in that it is further provided with a setting member (4) arranged axially with respect to the valve member (14) for adjusting the water flow time. Valve according to Claim 3, characterized in that the setting element is a screw (4) in the central bore of the pushbutton (1).