Control Valve and Orifice Replacement Information.

Hood style orifice with #72 starter hole and one eighth pipe threading.

When Ordering Orifices, Order an LP or NG regulator With The Orifices. When we are sending orifices, we will be able to pre-drill the appropriate BTU rating if the regulator is shipping with the orifices. If we have to send orifices, alone, these will be blank. Your installer will need to drill to the Certified gas flow rate on site depending on regulator pressure.

OCI replacement control valve.

Control valve attaches to manifold inside control panel. Knob mounts to front "D" shaped stem and gas orifice threads to the front. The perpendicular threading is where the valve attaches to the manifold to pull gas. Gas comes in through the bottom and out the front of the valve. Inside a small ball-valve adjusts the flow of gas.

Hood Style Gas Orifice.

A hood style orifice is simply a gas jet that screws onto the tip of the control valve. There are many sizes and lengths of hood orifice. This image shows the OCI and DCS orifice but the orifices here have different holes drilled in the end. LP (liquid propane) gas is a vaporized liquid and has a small physical mass so the hole in the propane orifice can be very small. Natural Gas has a much greatr mass so the orifice opening has to be much larger for the same amount of fuel to pass through.

A new orifice has only a starter hole and needs to be drilled for the type of gas and the BTU rating for the burner. In order to drill an orifice we need to know the burner is rated for (for instance) 20,000 BTU, is attached to propane or natural gas and what pressure the gas line is regulated to allow to the appliance.

TEC infrared burner orifice and control valve attached to the Gas Manifold.

Control Valve Adjustments

The orifice is attached to the end of the control valve where it extends into the barbecue grill burner. The hood orifice has a variety of lengths and widths but most are interchangable. People will usually change orifices only when changing the type of gas burned in their barbecue, grill or fireplace as it is extraordinarily rare for an orifice to become damaged or need to be replaced for any other reason.

The orifice extends the control valve into the venturi tube section of the burner which is open so gas is mixed with air as the gas shoots into the burner. The orifice has a hole in the tip that allows only so much gas to pass into the burner. The hole in the tip is calculated by comparing the BTU rating of the burner to the type of gas and the amount of pressure the gas line holds which is dependent on the gas regulator.

Hood style orifice with #72 starter hole and one eighth pipe threading.

When Ordering Orifices, Order an LP or NG regulator With The Orifices. When we are sending orifices, we will be able to pre-drill the appropriate BTU rating if the regulator is shipping with the orifices. If we have to send orifices, alone, these will be blank. Your installer will need to drill to the Certified gas flow rate on site depending on regulator pressure.

OCI replacement control valve.

Control valve attaches to manifold inside control panel. Knob mounts to front "D" shaped stem and gas orifice threads to the front. The perpendicular threading is where the valve attaches to the manifold to pull gas. Gas comes in through the bottom and out the front of the valve. Inside a small ball-valve adjusts the flow of gas.