Arrangement and operation of pneumohydraulic valve

Added: 05.05.2017
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Description

3D assembly of pneumohydraulic valve in COMPASS program. Valve device and operation. During welding operations, parts of welding machine heads located in the arc thermal action zone are heavily cooled with water. Untimely disconnection of cooling water during interruptions in the welding process leads to its overflow. The pneumohydraulic valve is designed to automatically switch on and off the water supply at the beginning and end of the welding process. The valve is assembled in the following order. Nozzles 12 are inserted into holes 0 and 18 of housing 5 and welded by electric welding by seam of T4 type with legs of 5 mm. Rod 2, together with valve 4 embedded in bore of rod 0 35, is installed in body 5 with cut rod down so that valve 4 closes hole 0 22 in body from above. Nut 6 and tip 7 are screwed onto rod 2; nut (6) fixes position of tip on rod thread. Two washers S with membrane 10 between them are put on rod of tip 7 with convex surfaces one to the other and tightened with nut 9 with washer 23. Cover 1 with gasket 24 is attached to housing on the side of rod 2 with screws 3. In this case, the projection 0 8X4 of the rod must enter the corresponding socket on the cover. Separately, the lower cover 13, which consists of the bushing 20, the gasket IS, the valve 21, the stem 22, the spring 19 and the cap 11, is assembled. Connector 20 is screwed into hole of cover M22 x 1.5 from outside. Gasket 18 is placed between connector and cover. Hole of union is closed inside cover by rod 22 with valve 21. Note here that ledge with rod lug 22 enters union hole while valve 21 is pressed against said union by rod collar. Spring 19 is put on rod and pressed by cap 11 until stop against cover 13. In assembled form cover is fixed to housing by screws 3, clamping membrane between flanges. The nozzle 14 is then screwed into the hole M10 of the cover 13 with a gasket 17 pre-fitted thereon. Hole of connector 0 5 is closed by needle 16. Cap 15 is screwed on the connector until stop. The valve operates as follows. At the beginning of the welding process, compressed air at a pressure of 5 kgf/cm2 is supplied to the welding apparatus to create a vacuum in the tube that sucks the unused flux from the welding site. Some of this air is supplied to connector (20). By pressing the valve 21 through the opening of the cap 11, air enters the cavity of the cover 13, presses the membrane 10 and opens the valve 4. Cooling water under pressure of 2 kgf/cm2 is rushed to welding unit through RH connector (12), open valve (4) and LH connector (12). At the end of the welding process, the access of compressed air to the valve is stopped, and the remaining air in the cover 13 gradually leaves through the gap between the opening walls of the nozzle 14 and the needle 16, after which the membrane 10 is lowered, and the valve 4 closes the water. This gap is adjusted so that during short-term interruptions of the welding process, water access to the unit does not stop. In the assembly drawing, the needle 16 should be shown screwed to a depth of 10 mm.