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> Vintage dole air valve vari vent no. 1A
Vintage dole air valve vari vent no. 1A
DOLE AIR VALVE IS SPECIALLY DESIGNED TO BE PART OF OIL, GAS OR STROKER FIRED SYSTEMS WHERE THERE IS INTERMITTENT FIRING AT EXTREMELY LOW PRESSURES. IT BALANCES ONE-PIPE STEAM HEATING SYSTEMS, GIVES DEFINITE CONTROL OF RADIATOR VENTING. STRAIGHT LINE CONTROL - ANY VENTING SPEED REQUIRED BETWEEN VIRTUALLY CLOSED AND WIDE OPEN.
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