|Wesman offers a complete portfolio of Controls and Accessories for the its oil an gas fired combustion systems. Each control valve is designed for a specific purpose and cannot be substituted by ordinary valves.
Burner Management Systems
The Burner Management System is a pre-wired control box for supervision of single / multiple burners on an installation with choice of automatic or manual start and UV or flame rod flame failure monitoring system. It can be relay logic based or PLC based with operator interface. It can be programmed for sequential start and shut down of the burners.
Sensitrol Oil Valves
Sensitrol Valve is a tight shut-off valve with precision V-oil port for micro-metering and uniform flow of oil through-out the 180 degree sweep of the control handle. Sensitrol Valves are tight shut-off valve to prevent dribbling oil into burners during shut-down. It also permits the convenience of shutting off the burner without disturbing the Sensitrol's limiting orifice setting. Sensitrol valves are available in 6 sizes depending on oil flow requirements.
Limiting Orifice Gas Valves
Limiting Orifice Gas Valves regulates the flow of gas in the burner for adjustment of air / gas ratio. Limiting Orifice Valves are installed in upstream of nozzle mix gas burner for adjustment air / gas ratio. A V-port plug is adjusted to increase or decrease of flow of gas. Limiting Orifice valves are not designed for turning off gas for which suitable shut-off valves are to be installed in the upstream.
Ratiotrol Oil Valves
Ratiotrol valves are accurate and used for automatic control proportioning of oil and air flow. Ratiotrol valves maintains the balance between fuel and combustion air for complete combustion in burner. It is used to control burner from high-fire to low-fire and vise versa i.e., as combustion air is turned up or down, the Ratiotrol controls the oil to flow in proportion. Ratiotrols are available in two sizes.
Air-Gas Ratio Regulators
Air-Gas Ratio Regulators gives constant air / gas ratio at all the firing rates. It is used over a wide range of firing rates both in premix and nozzle mix gas burner systems. In case of Premix burners, the vent is open to atmosphere then the regulator can be used as an atmospheric regulator i.e. Zero governor and supplies the gas to the premix burner. In case of nozzle mix burners, the vent of the regulator is cross connected to the main air line downstream of the control valve. In that case, the regulator outlet pressure is equal to air impulse pressure and the gas remains proportional to air flow at all the firing rates. In premix burners and nozzle mix burners, separate regulator for each burner is preferred to avoid interference or interaction.
Adjustable Port Valve (for oil and gas burner systems)
Adjustable Port Valves are precision build and ideal for automatic control of fuel / air flow to meet the control purpose. As these valves are meant for control purpose only, they should not be used as shut-off valves. Adjustable Port Valves are used individually for control of a single fluid or for multiple combinations for control of fuel, air & atomizing air or controlled mixing of process fluids. Adjustable Port Valves are generally used for auto-controlling system of furnace temperatures. It controls fuel or air on the basis of signal given by its controlling modulating motor.
Gas Metering Orifice Systems
Metering Orifice System is the accurate way to measure gas flow to individual burner to have balancing burner inputs. Metering orifice system are installed in the individual burner gas lines to expedite adjustment of air / fuel ratio. It also allows for easy checking of operation from time to time while the burners are firing.
UV Flame Sensor
UV Flame sensor gives the signal of the presence or absence of a flame or UV light. The Flame Detector Relays / Flame switches used with appropriate sensors energies the UV photo-tubes absence of the flame, the Flame-ON relay is de-energized and shuts–off the fuel solenoid valves as a safety measure to prevent any explosion.
Flame rods have the same function as the UV Flame Sensor and are required for the safety of the combustion system against sudden power failure or any other cause for flame failure.
Flame Rod is energized by Flame switch with alternating voltage. When the rod comes in contact with Flame then the alternating voltage passing through the rod is rectified by flame to a small DC Current which can be amplified and checked by flame switch to confirm the presence of the flame by energising the Flame-ON relay. As a result the fuel solenoid valve is energized and fuel flow takes place. In the absence of the flame, the Flame-ON relay is de-energized and shuts-off the fuel solenoid valves preventing further fuel flow.
Butterfly Air Valves
Wesman manufactures its own range of Butterfly valves that are used for manual / motorized input control and for balancing of burner firing rates. Butterfly valves are used to control air required in the burner inlet for complete combustion. Butterfly valves should be the same pipe size as the equipment in the line they are serving in order to give a negligible pressure drop when the butterfly valve is fully open.
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