Pneumatic And Hydraulic Equipment Page 585

*Standard on N/O valves. Option Description -BOS Booster for low pressure pilot signals* -22 Panel mounting nuts -BIN Bottom inlet for N/C models -BRB Brass Body -VAI Fluoro-elastomer Diaphragms (Viton) -50 Duro 50 Durometer Diaphragms Options No sliding seals (most models) Compact High Flow No lubrication required (most models) Fast response High Reliability Built-in "Quick Dump" N/C Model N/O Min Max Cv 125 psi 125A-3-10-21 N/C 0 125 0.2 51.5 125A-3-11-21 N/O 10 125 0.2 88.2 125AA-3-10-21 N/C 10 125 0.2 49.7 250A-3-10-21 N/C 10 125 0.8 88.3 250A-3-11-21 N/O 10 125 0.8 84.0 250AA-3-10-21 N/C 15 125 0.8 72.5 250-4A-21 NC/NO 10 125 0.8 72.0 250-4AA NC/NO 20 125 0.8 41.2 500A-3-10 N/C 0 125 2.2 97.8 500AB-3-10 N/C 10 60 2.2 53.2 501A-3-12-21 N/C 0 125 2.4 104.0 501AA-3-10-21 N/C 15 125 2.4 41.5 501-4A NC/NO 15 125 2.0 71.3 501-4AA NC/NO 15 125 2.0 69.8 590A-3-10 N/C 0 125 3.8 94.2 590AB-3-10 N/C 10 60 3.8 64.2 125 and 250 Series Ultra Low Pilot Interface valves* 125 psi* 125LA-3-10-21 N/C 30 125 0.2 1.8 125AH-3-10-21 N/C 30 125 0.2 9" H2O 250AL-3-10-21 N/C 30 125 0.8 2.1" H2O 250AH-3-10-21 N/C 30 125 0.8 9" H2O *Max. pilot; 125LA-30psig, 125AH-10 psig, 250AL-10 psig, 250AH-30 psig. Pressure Range Min. Pilot Pressure Requirements at line pressure of BASIC NORMALLY CLOSED VALVE (250A shown) BASIC NORMALLY OPEN VALVE (250A shown) Held closed by pressure against unbalanced area of bottom diaphragm. Actuated by pilot air applied to greater area of top diaphragm. Held open by pressure against unbalanced area of top diaphragm. Actuated by pilot air applied to greater area of booster piston and top diaphragm. AIR-PILOTED 2, 3, AND 4-WAY VALVES Single Air Pilot A conventional single air pilot-spring return function. Pilot signal must be maintained or valve will return to normal position. Ultra-low Pilot Capable of shifting valve with an ultra-low pilot signal. Momentary Pilot Air Designated as an "AA" air-piloted valve. A momentary signal from a 2-way piloting valve initiates opening of the "AA" valve. Supply pressure proceeding to the cylinder port feeds the pilot system to complete the valve opening and compensate for any minor pilot leaks. Momentary actuation of any 2-way "pilot exhaust" in the system will vent the pilot, and allow the "AA" valve to close. H U M P H R E Y Humphrey JHF Catalog [ Volume 7 ] (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com 585 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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