Robertshaw 700-804 Gas Valve

The Robertshaw 700-804 is a high-capacity combination gas valve designed for demanding commercial and industrial heating applications. This millivolt gas valve operates on a 750mV system, making it a reliable solution for standing pilot setups where external power is unavailable. Featuring a 3/4" NPT inlet and outlet, the 700-804 provides a straight-through flow pattern with a capacity of up to 300,000 BTU/hr. The unit is factory-regulated for natural gas with a standard 3.5" WC manifold pressure setting. Built for durability in high-ambient environments, its multi-position mounting capability allows for flexible field installation. This HVAC replacement valve includes a manual pilot adjustment and a standard thermopile connection, ensuring compatibility with most commercial fryers, boilers, and space heaters requiring a 700 series Robertshaw valve. Technical precision in the internal diaphragm and solenoid design ensures consistent pressure regulation and safety shut-off performance during high-demand cycles.

Key Benefits for Technicians:

• High-Flow Capacity: Rated for up to 300,000 BTU, supporting large-scale commercial burners and equipment.
• Millivolt Operation: Designed for 750mV thermopile systems, providing independent operation without line voltage.
• Field Versatility: Multi-position mounting allows the valve to be installed in any position except upside down.
• Rugged Construction: Engineered to withstand high-use commercial environments and thermal cycling.
• Standardized Ports: Features 3/4" NPT connections for seamless integration into existing gas trains.

Common Installation & Operation Questions:

Can this millivolt valve be converted to Liquid Propane (LP)?
Yes, the Robertshaw 700-804 can be converted using a 1751-003 LP conversion kit. Always verify the spring and orifice requirements for the specific BTU load before commissioning.

What is the maximum pressure rating for this gas valve?
The valve is rated for a maximum inlet pressure of 1/2 PSI. Use a primary regulator upstream if your supply line exceeds 14" WC to prevent damage to the internal diaphragm.

Why is my pilot staying lit but the main burner failing to engage?
This often indicates a drop in millivoltage under load. Test the thermopile output; it must maintain at least 450mV-500mV while the circuit is closed to overcome the internal solenoid resistance.

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.