Can I install this relief valve in a horizontal orientation

What causes this 3

Will this work as a substitute for the Q314AK11

High BTU Capacity: Rated for 972

Williams P323095 Heat Sensor Can I install this reliefAs an HVAC professional, you know that consistent blower cycling is the difference between a satisfied client and a callback. The Williams P323095 Heat Sensor is the critical OEM fan switch required for precise thermal management in Williams Direct Vent Furnaces. This ceramic heat sensor is engineered to trigger the Blower 2303 assembly, ensuring the fan engages only when the heat exchanger has reached operating temperature and continues to run until