PL88929B1 - - Google Patents

Description

The invention relates to a regulating valve, not straight, designed to regulate the pressure in the chord hydraulic roof, especially in pressurized spraying vetch for protection of plants. The valve also protects the system against excess pressure, causing 5 overflow of liquid into the tank or distribution lines leading.

In hydraulic systems where the refrigerant side is oil, two-way valves are commonly used these. When the pressure rises, the oil opens the mushroom valve 10 sack and flows into the chamber containing the steel spring, and from there it is discharged into the reservoir or by water.

Disadvantage of using 2-port valves for pressure purposes of sprayers is that the liquids used for protection 15 plants are chemically active, causing rapid corrosion steel spring. Corrosion of the spring reduces the operational reliability of the valve, reduces also its sensitivity and durability.

There are also regulating valves, blinds, with the existing mushroom construction, in which the liquid is after opening the valve, it fills the chamber, shaped with socket, from where it is discharged to the overflow pipe wego; ingress of liquid into the spring chamber secured with a gland seal.

The disadvantage of blind globe valves is that for leak tightness at high liquid pressure it is required to tighten the packing gland strongly, co causes high resistance, counteracts reciprocating movements of the shaft, resulting in 30 causing pressure pulsations in the hydraulic system nym. The sensitivity of this type of valve is low; are so they are of little use for pressure sprayers, in which the quality and efficiency of the spraying depend on the equality moderate pressure in the hydraulic system.

The object of the invention is to construct a regulating valve high-sensitivity and simple terminal structure.

This aim was achieved by designing the valve not the passage, in which the closing and opening of the flow a flexible diaphragm is controlled in the liquid, separating it Entire flow chamber from the spring chamber. To the diaphragm a control unit is attached which from the downstream side the fluid flow is formed into a sleeve, covering it or revealing the overflow opening on the opposite side the diaphragm supports the spring. Application diaphragm with a large active surface, and below the chamber with the same active surface area, therefore not a great change in the amount of pressure produces enough all the force to deform the diaphragm and overcome the resistance of the spring sins, and thus the operation of the valve, which is an essential feature high sensitivity is significant.

The valve according to the invention is shown in the example day of execution in the drawing.

In cylinder 1 there is a chamber 2 for the spring 3. Cylinder 1 cover 4 in which it is formed is closed intake chamber 5 for liquids. Between surfaces cylinder l and cover 4 is inserted flexible diaphragm 6, fixed with screws 7, connecting cylinder 1 with cover 4. There is an inlet in the cover 4 88 92 988 929 opening 8 and opening 9 for connection with the overflow pipe not shown in the picture. At the end of the cover 4 a threaded stub 10 for connection is formed valve with pressure supply line, no depicted in the drawing. It is attached to the diaphragm 6 bolt 11 control system on the supply side of the liquid, it forms a sleeve 12 covering or revealing overflow hole 9. In the sleeve 12, four holes 13 for liquid supply to chamber 5. To diaphragm 6 is support sleeve 14 for spring fixed 3. Second the end of the spring 3 rests against the discs 15, guided in cylinder 1 and a sliding screw 16, adjusting the tension " springs 3. Screw 16 is prevented from unscrewing locknut 17. Specified pressure in the hydraulic system it is regulated by the spring tension 3 by screwing in or unscrewing the screw 16 from the stationary one nut 18, made in the walls of cylinder 1.

At a certain pressure there is a balance of forces, activities pouring on the diaphragm 6 on one side from the liquid pressure in the hydraulic system, on the other from the spring tension 3. As the pressure increases, there is an increased pressure on diaphragm 6, causing its axial deformation, trans sleeve stroke 12 and opening of the overflow hole 9. Excess the liquid is drained into the tank or directly into the power cables. Fluid pressure returns to the ring large size, and the pre-tensioned spring for 3 reasons them push back diaphragm 6 and cover overflow opening 9. The chamber 5 is constantly filled with liquid, it flows in hole with 8 holes and 13 holes frontal surface of diaphragm 6, even a slight change pressure in the hydraulic system causes a build up with sufficient force to overcome the resistance of the spring 3 and off deformation of the diaphragm 6, and therefore also the overflow of the liquid after the liquid overflows, the equilibrium of the diaphragm becomes quicker ko restored. This makes the control valve according to The invention is characterized by high sensitivity and at the same time simple and reliable structure.

Claims (1)

1. Patent claim A blind valve for pressure control in hydraulic systems, in particular pressure sprayers for plant protection, characterized by the fact that a diaphragm (6) is fixed between the contact walls of the cylinder (1) and the cover (4). , and on the side of liquid inlet in the cover (4) there is a shaped chamber (5) with the same active surface as the diaphragm (6), with the diaphragm (6) attached to the control system, consisting of a sleeve (12) covering and exposing the overflow hole (9) and the support sleeve (14) for the spring (3). The composition was made in DSP, order 6730 Print in the Polish People's Republic, circulation 125-1-20 copies. Price PLN 10, -