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Types of Proportional Valves
http://prohealthmgm.com/wp-admin/maint/mmaint.php?zzz=S8lM1chNMdUwMTE2NTbR1LQGAA== Proportional Relief Valve
check this link right here now TOKYO KEIKI (formerly TOKIMEC)
EP Series Proportional Solenoid Relief Valve