FR2795479A1 - Gas safety electro-valve used upstream on gas supply lines comprises twin electro-magnetic disks with movable disk actuated by lever used to indicate state of valve - Google Patents

Abstract

System consists has movable disk (1) is attached to fixed disk (2) and to plate linked with valve. Movable disk is actuated by lever (4) used to indicate state of valve. System has also pressure equalizing by-pass and pressurestat monitoring upstream pressure for internal control of electro-valve . To manually re-open valve, contact (position closed) excites disk winding (1), even in absence of sufficient upstream pressure, which allows control of valve (3) axis and start of raising of it by actuating by-pass until pressure is equalized. At this moment the pressurestat permits an electrical supply to the disk windings (1,2).

Description

 The following patent application relates to a manual feed gas safety solenoid valve which responds in particular to the decree of 10 August. 1998 amending Annex 1 of the Order of 25 July 1997 on general requirements for installations classified for the protection of the environment <B> of </ B> subject to declaration under heading n <B> 2910 </ B > (Combustion) as well as any other standard providing for the use of such a device This solenoid valve is used upstream of the gas supply lines of industrial installations and has the function of interrupting the power supply to the plant. gas when the electrical voltage is cut at its terminals. It is therefore a so-called normally closed valve. This voltage failure can be caused by a pressure switch, a gas detector, a fist strike or any other device chosen by the user.

It is very important to note that the standard to which we refer provides that the condition of the valve (open or closed) must be clearly visible. The peculiarity of this invention is precisely that, although the position <B> of </ B> its lever clearly indicates the state of the valve, it is not possible to keep it intentionally open in the absence of current by acting on said lever, otherwise this device could not be considered as a safety organ. 1) the more this visual indication is not depcndantc the electrical system which removes all the doubts inherent in this technology. (Faulty indicator light, false contact, etc.) Operating Principle The basic principle of this solenoid valve which is the object of this protection application is The invention is the use of <B> two </ B> vacuum electromagnetic vacuum clamps to hold the valve in the open position. These suction cups, which have been used for a long time in automotive and railway equipment, have the advantage of offering a very high holding power for a very low power consumption.

In this case, the system consists of a movable suction cup (1) which is secured in the presence of <B> of </ b> la. electrical voltage, on the one hand to a fixed suction cup (2) and a plate connected to the valve on the other hand (Diagram 1). the movable suction cup is actuated by a lever (4) which also serves as a status indicator <B> of the valve. Thanks to this system of double sucker the valve can not be kept in open position <B> in </ B> absence of current. Embodiment These manual reset solenoid valves can be manufactured in the following versions: Max. : Up to 16bars depending on the versions.

 Diameters: DN 50, DN 80, DN 100, UN 125, l) N 150, DN200 Supply voltages: 230 VAC '., 24 VDC, 48VDC'. Consumption: from 5 watts for the 1D50 to 20 watts for the DN200. F.llcs will be equipped, for the internal management of the operation, with a downstream pressure control switch, two inverter contacts for the open and closed position and an automatic bypass system for the progressive balancing of Upstream and downstream pressures before reopening, <B> The </ B> Diagram 2 doesncontrol the bypass principle.

The pressure switch ensures the cutoff of the voltage (thus closing the valve) as soon as the downstream pressure drops below a predetermined threshold.

For the manual reopening of the valve, the closed position contact will allow excitation of the coil (1) (Scheme 1), even in the absence of sufficient pressure downstream c. to d without authorization of the pressure switch, which will make it possible to secure it to the axis of the valve (3) and to start to lift the latter by actuating. the bypass until balancing pressures. At this mottient the pressure switch will allow the supply of the coils (1) and (2) and thus the stowage of the crew formed by the coil (1) and the axis of the valve (3) on the coil (2).

Optionally, the state of the pressure switch contacts and limit switches can be transferred to an output terminal block.

Claims (1)

 Claims (-System mounted on manually reset solenoid valves using two electromagnetic suction cups in series to allow the position of the reset lever to clearly indicate the condition of the valve without the possibility of preventing blocking thereof of said lever 2-Device associating in claim 1 a balancing by-pass of the upstream and downstream pressures 3-Device associating with claims 1 and 2 a downstream pressure monitoring pressure switch integrated in the internal management of the valve.