Robertshaw 700-428 Gas Valve

The Robertshaw 700-428 Gas Valve is a high-capacity, 24V slow-open gas valve engineered for precision fuel management in standing pilot systems. This Uni-Kit gas valve features a 1/2" NPT inlet and a 3/4" NPT outlet, delivering a robust 240,000 BTU capacity for residential and light commercial furnaces. The slow opening gas valve design ensures a soft ignition by gradually ramping up gas flow, which reduces burner stress and "rollout" spikes common in high-output boilers and heaters. Factory-calibrated for natural gas at 3.5" W.C., this unit offers maximum field flexibility and can be converted to LP using the included regulator cover plate. As a veteran-grade HVAC replacement part, it incorporates a manual gas cock, pilot adjustment key, and a separate automatic pilot safety valve to ensure positive shut-off during pilot outage. The Robertshaw 700 series is a standard for contractors requiring a universal combination gas valve that supports multi-position mounting and reliable 24VAC coil performance.

• High-Flow Capacity: Rated at 240,000 BTU to handle larger heating loads without pressure drops.
• Soft Ignition Logic: The slow-open actuator prevents hard starts and extends the life of the heat exchanger.
• Multi-Position Mounting: Can be installed in any orientation except upside down, solving tight clearance issues in the field.
• Universal Conversion: Includes a 3/4" x 1/2" reducer bushing and LP regulator cover plate for immediate gas valve conversion.
• Field Serviceability: Features standard NEMA terminals and an inlet filtered screen to protect the gas control valve from line debris.

• Does the 700-428 work with LP gas? Yes, while factory-set for natural gas, it is a Uni-Kit gas valve and includes the necessary hardware for propane conversion.
• What does "slow open" mean for the ignition cycle? It refers to a delayed full-port opening (typically 3-6 seconds) which allows the pilot to establish a stable flame on the main burner before reaching maximum manifold pressure.
• Can this replace a fast-opening valve? In most standing pilot applications, a slow opening gas valve is a superior upgrade to prevent "booming" during ignition, provided the electrical ratings match.

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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.