Pneumatic And Hydraulic Equipment Page 588

501-4AA 4-way or "detented" 4-way valve with an internal compensating orifice which maintains actuated position after momentary pilot signal, maintains "trapped" pilot reserve to compensate for minor leaks, and speeds both the opening and the closing response time. Part No. Port Size Price 501A-3-12-21 1/2" $115.22 501AA-3-10-21 1/2" $154.10 501-4A Valve offers high flow rates (to 212 scfm at 125 psig). With all ports on the same horizontal plane, it provides convenient straight-line plumbing. 590AB Identical to the 590A valve but has a booster piston to reduce pilot air pressure requirements and is air-operated only. 590A 2-way or 3-way normally closed valve offering high flow rates to (312 scfm at 125 psig). Available with lightweight aluminum body or with optional brass body. The 590A requires no lubrication. 501A Multi-purpose valve offering high flow rates (to 275 scfm at 125 psig). With all ports on the same vertical plane, the 501A offers straight-line plumbing. It is constructed of lightweight aluminum which has been hard- coated for greater resistance to wear. 501AA 3-way or "detented" 3-way, normally closed valve with an internal compensating orifice which maintains actuated position after momentary pilot signal, maintains "trapped" pilot pressure to compensate for minor leaks, and speeds the opening and closing response time. Part No. Port Size Price 501-4A 1/2" $153.43 501-4AA 1/2" $168.24 Part No. Port Size Price 590A-3-10 3/4" $149.46 590AB-3-10 3/4" $176.45 AIR PILOT VALVES Humphrey (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com JHF Catalog [ Volume 7 ] 588 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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