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Severe Service Control Valves |
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BFP RECIRCULATION CONTROL VALVE |
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BF RECULATING VALVE |
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S/H, R/H, SPRAY VALVE |
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TURBINE / HEATER DRAIN VALVE |
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D / A PEGGING STEAM VALVE |
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SOOT BLOWER VALVE |
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GLAND SEAL STEAM CONTROL VALVE |
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SEVERE SERVICE CONTROL VALVE DIAGRAM |
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BFP RECIRCULATION CONTROL VALVE |
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The optimum valve for this application offers zero leakage at the rated pressure differential. The Leslie Aeroflow Valve offers Class 8, ZERO leakage, regardless of pressure drop or size. The Aeroflow Valve utilizes a Tri Shear plug design that protects the seat from wire drawing and erosion damage, to insure ZERO leakage performance for an extended period of time. Les-Cav Trim is normally used, with up to five stages of pressure reduction to prevent damage due to cavitation. This is normally a carbon steel valve, 900 to 2500 ANSI Class. Some applications due to high body velocity and erosion concerns require a C9 or CF8M body material. |
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BF RECULATING VALVE |
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The high pressure and low differential pressure makes this application ideal for Aeroflow cage guided balanced plug control valve. The balanced plug allows for stable control and economic actuator selection. Aeroflow’s standard custom cage gives Leslie the ability to match capacity with the application requirements. Normally this valve does not require a tight shutoff. In situations where the pump discharge pressure is less than 2500 psi, the C3 cage option affords the ustomer one valve to handle startup and main feedwater control. The cavitation trim exists for the first 40% travel, the control system limits travel to 40% until drum pressure is sufficient to stop cavitation. |
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S/H, R/H, SPRAY VALVE |
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This application is ideal for Leslie's T2 High Gain Trim. The accurate and fast positioning provides for a very tight band of temperature. The internal pilot allows stem sizes of 3/8" to 1/2" minimizing stem seal concerns. The custom cage for Reheat Spray allows for proper stroke versus flow and tight control. The Mini-P Trim is used for low flow control with cavitation protection to 2000 psid. The DPS (digital positioning system) utilizing optical position feedback for .00125" positioning accuracy provides superior position ability . This positioner with Leslie's T2 Trim insures accurate step changes in less than a second with no overshoot or undershoot. The characterized T2 Trim also has Leslie's Class 8 Shutoff, less than one drop per minute at rated DP. With no seat leakage, there is no unnecessary loss of steam temperature. Leslie's solution can turn a 15ºF band of temperature to a 3ºF band, saving the otherwise lost energy. Nominal savings for drum units of 400MW is $4500 per degree per year. |
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TURBINE / HEATER DRAIN VALVE |
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Aeroflow’s Zero leakage metal to metal seat provides the solution for this application. With our piloted plug there is no friction when seating, hydraulic lift for clean opening and thermal immunity for long life. The best configuration for this application is an angle body, in flow to close orientation, with anticavitation trim. |
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D / A PEGGING STEAM VALVE |
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This application is normally closed against a high DP, Leslie's Class VIII Shutoff prevents wear and unnecessary heat loss. Stable control and immunity to thermal shock add to this application need. Aeroflow is the solution. |
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SOOT BLOWER VALVE |
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This application is ideal for Aeroflow T2 Trim. Tight shutoff is required to keep seat leakage and wire draw from happening. Seat leakage will cause the header to build pressure wasting steam and blowing safetys. The speed and accuracy of T2 Trim will keep up with the rapid swings for tight pressure control, preventing the safetys from lifting. We can supply low makeup pressure requirements by throttling through the pilot. The DPS Positioner provides precise positioning of the stem. |
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GLAND SEAL STEAM CONTROL VALVE |
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This application is ideal for Leslie's Aeroflow Control Valve. The major problems with the supply valves is seat leakage due to wire draw of plug and seat ring. They supply steam when it's not needed and vent energy to condenser (lost efficiency). Leslie Class VIII Shutoff prevents wire draw, lost efficiency and frequent maintenance/ repair. Leslie characterized trim allows for the proper Cv for this low flow high pressure drop application. The vent valve typically has been a globe valve, but a K-Max will work well in this application. |
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SEVERE SERVICE CONTROL VALVE DIAGRAM |
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