| 摘要 |
<p>1386975 Valves HYDRAULIC INDUSTRIES Inc 22 Feb 1972 [2 Nov 1971] 38512/74 Divided out of 1386971 Heading F2V The subject-matter of this Specification is the same as that of the main Specification 1,386,971 but the claims relate to the valves 86, 98 and 91 connected to the return feed lines 18, 19, L2. Valve 86 connects the lines to exhaust and opens when pressure in the lines exceeds a predetermined value. Valve 98 connects the lines to the inlet 16 and is normally closed, but opens when pressure in lines falls below said predetermined pressure, such that said pressure is maintained. Check valves 91 connect the lines to motor ports 27, 28 and open when the pressure in the motor ports falls below said predetermined pressure.</p> |
