Oleo Hydraulics And Pneumatics

Ring Solenoid

Calibration process for the mobile spring of a solenoid valve

Process for calibration of the mobile core spring of a solenoid valve comprising an electromagnet subassembly associated with a pneumatic switching subassembly with a valve plug, the valve plug being moved in the body of the pneumatic switching subassembly firstly by a spring located in the mobile core of the electromagnet subassembly through a pusher.

Secondly by a spring located under the valve plug and bearing around the lower seating of the pneumatic switching subassembly, this process comprising the following steps: a force sensor is put into position, either at a predetermined distance from the upper face of the mobile core, this distance being equivalent to the actual travel distance of the mobile core, or directly in contact with the face of the core when it is required to adjust the spring based on its force after the travel distance (core in contact on the yoke); the spring is installed in a reaming providing for this purpose in the axis of the mobile core: an elastic split pin is put into position behind the said spring, that is forced more or less into the reaming of the mobile core while measuring the force generated by the spring on the sensor, and the split pin is no longer forced into the core as soon as the required force is measured by the sensor.

The present invention in general relates to improvements made to solenoid valves. It is more particularly applicable to solenoid valves comprising an electromagnet subassembly associated with a pneumatic switching subassembly with a valve plug, the pneumatic switching subassembly being composed of a body enclosing the valve plug trapped between two sealing seatings facing each other. The valve plug movement is provoked firstly by a spring located in the mobile core of the electromagnet subassembly by means of a pusher, and secondly by means of a spring located under the valve plug (usually called valve plug underspring) and bearing around the lower seating of the pneumatic switching subassembly, this valve plug underspring forcing the said valve plug into contact with the upper seating of the pneumatic switching subassembly when the solenoid valve is energized. In the rest position, in other words when the solenoid valve is not energised, the spring of the mobile core of the electromagnet subassembly pushes the core into contact on the pusher and forces the valve plug onto the seating of the lower channel of the solenoid valve.

The most frequently used solution to solve this problem at the moment is to sort the springs in order to reduce the manufacturing tolerance. This technique is a simple means of reducing manufacturing dispersions, but it still leaves relatively large variations and it increases the cost of the spring production due to manufacturing scrap.

Another solution used at the moment is to adjust the mobile core spring after the solenoid valve has been assembled. Consequently, the yoke, in other words the fixed core of the electromagnet subassembly, is perforated and drilled in the axial direction so that a threaded pusher can be fitted into it on which an O-ring is fitted to make it leak tight. This threaded pusher is in contact at one of its ends with the spring of the mobile core of the electromagnet subassembly.

In order to adjust the solenoid valve, in other words the spring force on the mobile core, all that is necessary is to apply the maximum usage pressure in the lower channel of the solenoid valve and then screw the pusher in until the spring of the mobile core seals the lower seating under the pressure. This known solution is precise because the mobile core spring only applies the force necessary to create a seal on the lower seating of the valve plug of the solenoid valve. The disadvantage of this solution is its manufacturing and installation costs: it requires tapping to be formed in the fixed yoke of the solenoid valve, machining of an additional part (threaded pusher) and the installation of an additional O-ring to seal the assembly.

Consequently, this invention relates to a process for calibration of the mobile core spring of a solenoid valve comprising an electromagnet subassembly associated with a pneumatic switching subassembly with a valve plug, the valve plug being moved in the body of the pneumatic switching subassembly firstly by a spring located in the mobile core of the electromagnet subassembly through a pusher, and secondly by a spring located under the valve plug and bearing on the lower seating of the pneumatic switching subassembly.

The process according to the invention may be applied to a normally open type solenoid valve. According to this particular application, the spring of the mobile core of the electromagnet subassembly is adjusted by using the sensor to measure the force generated by the valve plug underspring when it is assembled in the pneumatic switching subassembly and this force is reproduced in the mobile core spring so that the tolerances of the two springs are compensated by the setting of the mobile core spring.

About the Author

Ningbo Lida Pneumatic Complete Sets Co.,Ltd. specializing pneumatic components,solenoid valve,air cylinder & pneumatic fittings that these are inexpensive.It has with more than 15years.

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