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STEAM AS THE ENERGY SOURCE

STANDARD EQUIPMENT

Pilot Operated

A pilot operated valve can only be used with steam as the energy source. Pilot operated valves use steam pressure as the energy source to modulate the control valve. Steam from upstream of the valve is directed into a pilot valve. This pilot valve has an adjustable set point and temperature sensing bulb in the heated water. The pilot valve compares the set point to the sensed temperature and regulates the amount of steam passing through the pilot to the diaphragm in the bottom of the control valve.The steam pressure on the diaphragm opens to the downstream side of the valve. When the pilot valve senses the desire temperature is reached it closes; this does not allow any more steam to pressurize the diaphragm in the bottom of the control valve. The bleed line allows any steam pressurizing the diaphragm to be relieved and the valve closes.

In the event of high temperature or loss of building power the limit control closes the steam line from the pilot to the control valve which closes the valve. With a supply pressure of up to 15 PSI, 3 PSI is the minimum pressure drop permitted.

Pneumatic (Air) Operated Control Valve

Air operated valves use building control air pressure to modulate the control valve. The air signal is brought to an adjustable set point temperature sensing controller with a temperature sensing bulb in the heated water. The temperature sensing controller compares the set point to the sensed temperature. The controller regulates the amount of air that passes to the pneumatic actuator of the valve to modulate the valve. This allows steam to pass into the heater coil to maintain the set point of the controller. When the set point is achieved, no air is passed through the temperature sensing controller and the valve is closed. In the event of high temperature or loss of building power, the limit control shall close the air line to the valve and vent any air in the actuator to atmosphere which closes the valve.

Electronic Control Valve

Electronically operated control valves use a solid state temperature sensor which is wired to an electronic control module. The electronic control module has an adjustable set point. The control module compares the set point with the sensed temperature and sends an electric signal to a magnetic linear actuator on the control valve. The magnetic linear actuator modulates the control valve and regulates the amount of boiler water through the valve to maintain the set point of the controller. When the set point is achieved, the controller sends a signal to the valve actuator and the valve closes. In the event of high temperature loss or loss of building power, the limit control closes the electric power to the controller which closes the valve.

Steam Traps

CEMLINE provides float and thermostatic traps for both the drip and main trap. Float and thermostatic traps are acknowledged as the correct traps to use with continuously modulating control valves. Float and thermostatic traps provide immediate drainage of condensate and include a built in thermostatic air vent for venting air. The drain orifice is designed to provide a water seal and eliminate the loss of any live steam under all load conditions. Float and thermostatic traps should not be used to lift condensate.

Inlet Steam Strainer

Strainers are "Y" type with blow down connection and easily removable stainless steel strainer screen.

Source Steam Pressure Gauge

Large, easily readable pressure gauges to read both the source and generated steam pressure.

Vacuum breaker

A vacuum breaker will be mounted in the coil head and will break any vacuum which might occur when the steam is condensed.

OPTIONAL EQUIPMENT

Double Solenoid Safety System

An optional safety system, which will deactivate the main control valve as described in solenoid safety system, will also activate a second solenoid valve to drain excessively heated water. The controller is designed to permit different set points for the valve closure and draining.

Double Wall Coil

Double wall coils have inner and outer tubes with a vented leak path. If either the inner or outer tube fails, no cross contamination of potable water is possible and a visible indication of the leak will show. Double wall coils are only available in 3/4" OD tubing.

BIOLER WATER AS THE ENERGY SOURCE

STANDARD EQUIPMENT

CONTROL VALVE

Pneumatic (Air) Operated Control Valve

An air operated valve can be used with hot water as the heating medium. Air operated valves use building control air pressure to modulate the control valve. The air signal is brought to an adjustable set point temperature sensing controller with a temperature sensing bulb in the heated water. The temperature sensing controller compares the set point to the sensed temperature. The controller regulates the amount of air that passes to the pneumatic actuator of the valve to modulate the valve. This allows boiler water to pass into the heater coil to maintain the set point of the controller. When the set point is achieved, no air is passed through the temperature sensing controller and the valve is closed. In the event of high temperature or loss of building power, the limit control shall close the air line to the valve and vent any air in the actuator to atmosphere which closes the valve.

Electronic Control Valve

Electronically operated control valves use a solid state temperature sensor which is wired to an electronic control module. The electronic control module has an adjustable set point. The control module compares the set point with the sensed temperature and sends an electric signal to a magnetic linear actuator on the control valve. The magnetic linear actuator modulates the control valve and regulates the amount of boiler water through the valve to maintain the set point of the controller. When the set point is achieved, the controller sends a signal to the valve actuator and the valve closes. In the event of high temperature or loss of building power, the limit control closes the electric power to the controller which closes the valve.

Two way Valve

A two way valve modulates from fully closed to fully open varying the amount of hot water circulated through the coil to maintain the desired output temperature. When closed the two way valve may cause a change in the heating water loop pressure.

Three way valve

A three way valve modulates from directing all heating water through the coil to directing no heating water through the coil, varying the amount of hot water circulated through the coil to maintain the desired output temperature. The pressure drop in the heating system will be relatively constant with a three way valve.

OPTIONAL EQUIPMENT

Double Solenoid Safety System

An optional safety system, which will deactivate the main control valve as described in solenoid safety system, will also activate a second solenoid valve to drain excessively heated water from the heater. The controller is designed to permit different set points for the valve closure and draining.

Double Wall Coil

Double wall coils have inner and outer tubes with a vented leak path. If either the inner or outer tube fails, no cross contamination of potable water is possible and a visible indication of the leak will show. Double wall coils are only available in 3/4" OD tubing.