Spence E 1 1 4 Valve Els PW 29614 The Ranco LDK 110000 070 is a The Ranco LDK 110000 070 is a high duty 24VAC reversing valve coil engineered for precise electromagnetic actuation of 4 way reversing valves in residential and light commercial heat pump systems while the corrosion resistant internal components provide longevity in harsh mechanical environments This Spence Main Valve typically requires a minimum pressure differential of 10 PSI to ensure the internal diaphragm overcomes the main spring and pilot signal correctly Precise Capacity Control: The full port design ensures maximum flow capacity while the normally closed safety feature prevents unintended downstream flow