DE3132212A1 - Solenoid valve - Google Patents

Abstract

In solenoid valves equipped with a main cone and a preliminary stroke cone mechanically coupled to the latter, there is the risk that the mechanical coupling will fail. It was hitherto impossible to detect this from outside. Even an indicating device for the valve position gave no indication of such a fault. On the contrary, it gave a false signal: even though the main cone, which had come away from the preliminary stroke cone, was still in the closed position, its open position was indicated. The invention eliminates this deficiency by means of a position indicator (14) which interacts with the actuating rod (3) of the solenoid valve and which responds in the case of a position above that of the normal opening stroke. Thus not only is clear information provided as to the open position of the main cone but faults in the coupling are also indicated. <IMAGE>

Description

Magnetve TI

The invention relates to a solenoid valve with an inside or

externally guided main cone and one mechanically with the main cone coupled pre-stroke cone, which in turn is connected to the actuating rod of the solenoid valve connected is.

Large self-operated safety fittings in nuclear power plants are controlled by solenoid valves. Such solenoid valves, usually with a Vorhubkegel are equipped, must in short time intervals with regard to their Function to be checked.

Above all, the lifting function of the pre-stroke cone and main cone must be used to be controlled.

In the case of the known solenoid valves with a forward stroke cone, it has only been the case so far possible, the position of the forward stroke cone, for example via electronic travel sensors, to control. Only if the main cone is mechanically coupled with the forward stroke cone is, the function and the respective position can be accessed via the display of the forward stroke cone of the main cone are closed. However, if the mechanical coupling fails, so firstly, this failure cannot be recognized; secondly, it can be via the respective Stroke position of the main cone no more statements can be made.

The invention is based on the object of a solenoid valve of the initially to equip said type so that it can be seen whether the mechanical coupling between Pre-stroke cone and main cone OK and the main cone when actuated accordingly has reached the open position.

This object is achieved according to the invention by one with the actuating rod to interacting position indicator, which at one above the normal opening stroke the actuating rod in the lying position responds.

The actuating rod can be in a manner known per se Wear acting as a transmitter magnet with a position indicator that responds to it cooperates. In an advantageous embodiment of the invention it is provided that in addition to two well-known position indicators for the open and closed position of the solenoid valve another position indicator of the same type above the open position signaling Stellunc ,, indicator is arranged.

The invention makes use of the fact that in the event of destruction the mechanical coupling between the forward stroke and the main cone is the actuating rod is moved beyond the maximum stroke under normal conditions. One above The position indicator arranged in the normal stroke therefore gives a clear signal for a Disturbance.

The invention is explained in more detail using an exemplary embodiment. The drawing shows a solenoid valve designed according to the invention.

In a valve housing 1, a main cone 2 is arranged, which means a guide piece 2a provided in the valve housing 1 or, as in the left one Half of the drawing shown and marked with 2b, guided on the housing wall will. At a Actuating rod 3, a pre-stroke cone 4 is arranged, which in turn is coupled to the main cone 2 by means of a bolt 5.

In the main cone 2 there is one to be sealed off by the forward stroke cone 4 Bore arranged, while the main cone 2 interacts with a seat in the valve housing 1. The pre-stroke cone 4 is pretensioned by a spring 6.

The actuating rod 3 carries a magnet armature 7, which is from a magnet coil 8 is to be pulled in the opening direction. At its upper, immersed in a can 9 At the end, the actuating rod 3 is equipped with a magnet 10.

The magnet 10 interacts with three position indicators: The position indicator 11 shows the "open" position, the position indicator 12 shows the "closed" position at. But if the bolt 5 breaks, the actuating rod 3 by a certain distance h is pulled further to a stop 13, a position indicator signals 14 a malfunction. From the signal of the position indicator 14 it can be concluded that now the open position of the main cone 2 is no longer guaranteed. on the other hand but can due to the presence of the position indicator 14 when displaying the Position indicator 11 also ensures proper function with one in its upper Main cone located in the end position are closed.

Claims (3)

Claims t solenoid valve with an inside or outside guided Main cone and a pre-stroke cone mechanically coupled to the main cone, which is in turn connected to the actuating rod of the solenoid valve by a position indicator (14) interacting with the actuating rod (3), which, if the opening stroke of the actuating rod (3) is greater than the normal responds lying position. 2. Solenoid valve according to claim 1, characterized in that the Actuating rod (3) a magnet acting as a transmitter in a manner known per se (10) with a position indicator arranged above the normal opening stroke (14) cooperates. 3. Solenoid valve according to claims 1 and 2, characterized in that that in addition to two known position indicators (11, 12) for the open and closed position of the solenoid valve another position indicator (14) of the same type above the the open position signaling position indicator (11) is arranged.