EXPERIMENTAL RESEARCH OF WEARING PROCESSES IN METAL-METAL SEALING UNITS OF PNEUMATIC ELECTROMAGNETIC VALVES
DOI:
https://doi.org/10.20535/2305-9001.2015.75.55616Keywords:
electromagnetic valve, metal seal, shock loads, wear processes, gas leakage, damping deviceAbstract
Purpose. Experimental research of technical state change in metal-metal sealing units of pneumatic valve with two-positioned polarized electromagnetic drive. Design/methodology/approach. It has been shown that the work peculiarity of pneumatic valves with two-positioned electromagnetic drive and with metal-metal sealing is shock loads during its closure and opening. Such loads lead to intensive wearing process and increasing of gas leakage through the sealing units of different design and made of different materials. It has been experimentally confirmed, that the effective way of wear intensiveness decreasing in metal-metal sealing units is the use of special damping units in the valve Findings. As a result of experimental research it was concluded that including in the valve design of special damping device reduces the stress in the sealing unit elements, which occurs in the sealing units elements during the valve closing, and, as a result, the wear intensiveness of the sealing unit decreases. Usage of less wear-resisting, comparatively to the stainless steel 08Х18Н10Т materials leads to the increase of wear intensiveness of the sealing unit contact surfaces. Originality/value. Comparative analysis of the obtained experimental dependencies shows, that including of the damping device decreases the intensiveness of gas leakage increase through the closed valve, which occurs with the increase of the operational cycles. Damping element provides the kinetic energy dissipation that decreases the wear speed of the sealing surfaces of the valve slide and the saddle.
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