The control is effected by this arrangement of the second valve, whereby only the liquid is filled by the first valve. The device operates in a similar manner to that of FIG. The back pressure generated thereby by the spring 24 on the piston 22, 30 left side. Movable cylinder 22, for example by external influences to the right, opening the first valve is true, on the left side. This is a means of small regulating deviations obtain, 15 to the control carried out to very narrow pulses, i. A piston-cylinder unit thus forms a diagonal of a square of the sides of which the first two valves are arranged on top of the diagonals, and the other two valves are disposed downstream of the diagonals. This non-return valve 33, 33 ‘is connected in parallel with the second valve 29, 29’.

This ensures that the pressure in the pressure chambers 23, 23 ‘only works against the force of the opposing spring 24, 24’ and is not supported by the spring in the same pressure space 23, 23 ‘. This is a means of small regulating deviations obtain, 15 to the control carried out to very narrow pulses, i. When the piston 22 is loaded, however, still further, on the left side of the sharp re compressed spring 24, the pressure on the left side higher. In the conduit 7, two valves 8, 9 connected in series, wherein the first valve 8 is arranged on the pressure side, i. This valve serves, at a forward forced movement of the cylinder 22, to prevent cavitation in the pressure chambers 23, 23 ‘. It is also of advantage that the first valve is designed as a solenoid valve which is closed when de-energized.

The control is effected by this arrangement of the second valve, whereby only the liquid is filled by the first valve. This non-return valve 33, 33 ‘is connected in parallel with the second valve 29, 29’. After a short time, a stable state set up, in which, controlled by the second valve, exactly as much liquid flowing through the 10 throttle 12, that in the pressure chamber 3 a pressure seriee maintained which is as high as the spring back pressure to the desired position.

This arrangement has the parallelforbindrlser that on opening of the first valve is a purification of the first throttle 12, 32, 32 ‘.

When the piston 22 has 25 reached its desired position, close the electromagnetic valve 29 on the left side. The invention relates to a fluid-operated servo with a piston-cylinder unit, which has at least one of the liquid is influenced pressure space and a piston, a pressure generating device for the liquid, a liquid tank, a conduit between trykfrembrin-5 tion device and the liquid tank, in which in the series on the pressure side is disposed a first and on the tank side a second valve, wherein the pressure space is connected to a lpgave section between the two valves.

In another known device of this kind DE-OS 31 04 affected a slide connected with a piston from two sides with pressure. When the first valve’is closed, the induced pressure drop in the conduit 27, 27′ only of the first restrictor’.

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If the desired position is obtained, the valve closes, and the control unit holds, as described above, the piston fixed in the desired position. On opening of the throttle valve is cleaned automatically. The piston is moved too far to the right, the valve 9 closes again.

Check valves are simply constructed valves, which can be produced cheaply. In this case, opens the check valve Wherein two throttles is arranged, applies the beneficial effects of both directions of movement.

DKB – Vaeskestyret servo – Google Patents

Deviations fed back into the system, i. This allows, without changing the choke assembly size, a significantly higher rate of movement of the cylind clean 22nd DK B DK B 12 12 Seeie. The servo device according to any one of claimscharacterized in that the first valve 8; 28, 28 ‘ is designed as a solenoid valve which is closed when de-energized. Since the liquid stream, however, is limited by the 10 second throttle 35, it is possible that there may be sufficiently continuous serue liquid from the pressure generating means Princippet for denne styring er kendt fra “Control Engineering”, majside 65 – This opens the second valve 29 on the left side and lets the pressure escape from the pressure chamber 5 The control unit 5 then opens the second valve 9 to which a pressure parallelforbindelseer occurs in the pressure chamber 3.

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Should dirt particles have stuck there, so tearing the 30 of the past-flowing liquid. A piston-cylinder unit thus forms a diagonal of a square of the sides of which the first two valves are arranged on top of the diagonals, and the other two valves are disposed downstream of the diagonals.

In the right-hand pressure chamber 23 ‘prevails over the throttle 20 County 32’ remains trykfrembringelsesindretningens 25 pressure which displaces the piston 22 to the left. A pressure generation device 25, such as a pump or an accumulator, delivers a liquid, for example, a hydraulic fluid or a gas, through two parallel conduits 27, 27 ‘to the tank No separate wires are needed to drive the liquid 10 in parallel with the throttle valve.

The fluid pressure generated thereby by a pressure generating device 5, for example a pump 5f and is transported via line 7 to respectively a tank or container 5 6. In addition, this device requires thus two chokes and a third solenoid valve and is therefore more expensive in terms of the number of composite components 25 and a special control of the third solenoid valve.

I serie med parallelforbindelsen af drossel 32, 32′ og 10 kontraventil’ er forbundet en anden drossel 35, 35′. For example, when the check valve is completely open on the left side, restricts the flow of fluid exclusively from the second throttle The result is a very compact construction.

Control arrangement for at least two hydraulic consumers and pressure differential valve for said control arrangement. In that the first valve is closed when de-energized, is obtained also when de-energized consumed much liquid as there is only little flowing fluid through the throttle. These valves has the additional advantage that the event of power failure or other disturbance of the same type for the controller 25 allows a neutral position of the piston.

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Between the two valves 8 and 9, the conduit 10 has 7 is a line section 10, from which a cross-conduit 11 leading to the pressure chamber 3rd. The first valve 10 is shunted by a throttle 32, 32 ‘, i.

In each conduit is on the pressure paralllforbindelser is arranged a first 35 valve 28 and on the tank side a second valve 29 between the first and the second valve have each wire 27, 27 ‘a 9 line section 30, 30’, from which a cross-line 31, 31 ‘establishes the connection to the piston-cylinder device 21, pressure space 23, 23’. This ensures that the pressure in the pressure chambers 23, 23 ‘only works against the force of the opposing spring 24, 24’ and is not supported by the spring in the same pressure space 23, 23 ‘.

The first valve 8 is designed as a solenoid valve which is closed when de-energized, i. The piston 22 thus migrates back to the right, and as long until the control unit intervenes, and the second valve 29 opens on the left side.

DK165601B – Vaeskestyret servo – Google Patents

The servo device according to any one of claimscharacterized in that the second opgavd 9; 29, 29 ‘ is designed as a solenoid valve which is open when de-energized. Further, there are, however, parallel to the second valve 29, 29 ‘arranged in a direction towards the pressure chamber 23, 23’ opening non-return valve 33, 33 5 ‘.

The servo device according to claim 2, characterized 5th ed in that the second valve 9; 29, 29 ‘ on the tank side reacts faster than the first valve 8; 28, 28′;’ on the pressure side.

In a preferred embodiment, the first valve is designed as a pressure chamber toward the check valve opening, and 20 in series with the parallel connection of the choke and the first valve there is arranged a second throttle. It is also of advantage that the first valve is designed as a solenoid valve which is closed when de-energized.

This allows, without changing the choke assembly size, a significantly higher rate of movement of the cylind clean 22nd. The second throttle 25 thereby determines the rate at which the piston is movable, when the check valve opens, and the first throttle virtually short-circuited or bypassed.