What is the maximum surge pressure for this switch

The fail-safe direction (normally open or normally closed) is determined by the mounting orientation on the valve linkage

particularly sizing between 1-1/2" and 2"

which are readily available as service parts

This genuine OEM component is engineered to facilitate a seamless field adjustment from Liquid Propane (LP) to Natural Gas (NG) for specialized Reznor heating equipment

Lochinvar & A.O. Smith 100110861 Valve 30067439-890 What is the maximum surgeThe Lochinvar & A. O. Smith 100110861 is a high performance Liquid Propane (LP) gas valve designed for critical regulation in hydronic boilers and water heating systems. This 24V step opening gas valve is pre configured for a 11" WC (Water Column) output, ensuring stable manifold pressure for efficient combustion cycles. Featuring a 1 2" NPT inlet and a 3 4" NPT outlet, it provides a secure fit for standard residential and commercial piping