| 摘要 |
<p>PURPOSE:To check abrasion in lip packing by propagating pressure in a pressure-feed liquid at the side of a valve head chamber to a sealed lubricating liquid via a diaphragm, and constituting it so as to be led to the counter lip side of the pressure-feed liquid lip packing doing a sealing action for this lubricating liquid. CONSTITUTION:A high pressure plunger pump boosts pressure in a pressure-feed liquid sucked in a valve box chamber 15 from a suction port 12c by reciprocating a plunger 14. In this case, there is provided with a sealing device which compresses pressure-feed liquid sealing V packing 16 pinched by a male adapter 18 and a female adapter part 20a of a lantern ring 20 and lubricating liquid sealing V packing 17 pinched by a female adapter 19 and a male adapter part 20b of the lantern ring 20 from both sides, and doing a seal between the plunger 14 and a packing case 22. In addition, this sealing device should be constituted so as to make pressure in the valve box chamber 15 propagable to a lubricating liquid via a diaphragm 23.</p> |
