Spence Engineering A85 Pilot

The Spence Engineering A85 Pilot is a high-performance air adjusted pilot designed for industrial steam pressure regulation where remote adjustment is required. Built with a rugged cast iron body and stainless steel trim, this pilot is engineered to withstand the rigors of heavy-duty boiler rooms and district heating plants. It features a unique 3-7/8:1 air ratio, allowing technicians to use low-pressure air signals to control high-pressure steam through a main valve. This pneumatic loading capability eliminates the need for manual spring adjustments in hard-to-reach locations, making it a staple for Spence Type E and Type D pressure regulators. By utilizing an air-loaded pressure pilot, contractors can achieve precise downstream pressure control with minimal deviation, even under fluctuating load conditions. The integration of hardened stainless steel seats ensures tight shut-off and resistance to wire-drawing, a common failure point in inferior pilot valves.

Technical Benefits for Contractors

• Pneumatic Remote Control: The 3.875:1 loading ratio enables precise setpoint adjustments using a standard shop air or instrument air signal.
• Durable Construction: The cast iron housing and corrosion-resistant internal components provide long-term reliability in high-temperature environments.
• Interchangeability: Fully compatible with the Spence Type ED pressure regulator series, allowing for easy field upgrades from standard spring pilots.
• Reduced Maintenance: The stainless steel diaphragm and trim package are designed for high cycle counts without fatigue or loss of accuracy.
• Precision Throttling: Provides stable control for steam pressure reducing valves, prevents hunting, and protects downstream equipment.

Common Installation & Operation Questions

What is the maximum air loading pressure for the Type A85?
The pilot is designed to handle control air pressures that translate through the 3-7/8:1 ratio to meet the desired steam delivery pressure, typically not exceeding the maximum rating of the pilot diaphragm chamber.

Can this pilot be used for temperature control?
While the A85 Pilot is primarily for pressure regulation via air signal, it can be integrated into a larger control loop where a temperature controller provides the pneumatic signal to the pilot.

Is the A85 compatible with all Spence Main Valves?
It is standard for Spence Type E main valves. Technicians should verify that the main valve port size and spring range are calibrated for use with an air-loaded pilot system to ensure stable operation.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.