Air/Gas Ratio Controlling Gas Valve Actuator w/o Switch (120V)

SKP55? pressure regulating electro-hydraulic actuators are used in combination with VG? series gas valves to provide slow opening, fast closing safety shut-off and air/gas ratio control for industrial and commercial burner applications.

The SKP55 actuator controls the pressure difference across a restriction in the gas supply line as a function of the pressure difference across a restriction in the air supply duct so that the air to gas ratio remains constant irrespective of air volume changes. There is no need for an upstream constant pressure regulator when using an SKP55 actuator within the applicable pressure range of the VG valve body.

Since a single valve performs three functions: safety shut-off, constant pressure regulation, and air/gas ratio control, fewer components and fittings are required to assemble a gas train. This significantly reduces both the size and the weight of the gas train. The total pressure drop across the gas train arrangement is reduced, allowing for the use of smaller diameter gas trains in most applications.

The modular design allows the SKP55 actuator to be used in combination with all VG series gas valves from 1/2-inch to 6-inch in size. The actuator is easily mounted on the square flange of any VG valve with four bolts. No gaskets or seals are required when mounting the actuator. A visible position indicator displaying the entire stroke range of the actuator shows the valve position. A light indicates when power is on.

Features:

• Excellent control for recuperative burners, burners utilizing preheated combustion air, and variable orifice/flow regulating burners
• Air/gas ratio maintained even when air flow is disrupted
• Safety shut-off control and pressure regulation in one compact unit
• Compensates for variations in combustion chamber back pressure
• Low-fire, excess-air biasing adjustment
• Simplified commissioning of burner and reduced start-up time
• Optimal solution for premix burner applications