allowing the potential relay to safely cycle the start circuit out of the loop

it is the standard specification for Maxitrol RV91

For larger shafts

we know that a dirty flame sensor is the primary culprit behind furnace short cycling and ignition lockout codes

Sensus 138-18-021-01 Spring allowing the potential relay toWhen you're servicing or upgrading a Sensus 243 RPC regulator, precision in your spring selection is what prevents callback heavy issues like pressure drift or poor lock off performance. The Sensus 138 18 021 01 White Spring is the industry standard for technicians needing a reliable 1 to 5 PSI outlet pressure range. This heavy duty RPC pilot spring is specifically engineered to handle the unique relay action requirements of the Sensus Gas Division