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COMPRESSOR AIR EXTRACTION |
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3 WAY PLOT FOR AE |
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FALSE START DRAIN |
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GAS PURGE SYSTEM BLOCK VALVE |
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GAS PURGE SYSTEM VENT VALVE |
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ATOMISING AIR BYPASS VALVE |
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FUEL NOZZLE PURGE VALVE |
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LIQUID FUEL STOP VALVE |
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TRIP OIL SOLENOID VALVE |
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GENERATOR CONTROL VALVE |
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GAS TURBINR VALVES DIAGRAM |
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COMPRESSOR AIR EXTRACTION |
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Laurence solved these problems by providing a butterfly valve with an all stainless steel valve body and an all stainless steel actuator with a single main bearing to prevent binding from heat distortion. The Laurence Compressor Air Extraction Valve is available in 6", 8" and 10" sizes, with spacers to adapt to various turbine configurations. The all stainless, high temperature design sets the Laurence valve apart from standard butterfly valves and provides years of trouble free service. |
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3 WAY PLOT FOR AE |
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Laurence provides a Three-way Rotary Solenoid Actuated Valve with greater actuation and return reliability than conventional solenoid valves. This is possible because of the mechanical advantage achieved by using a long external operating level to actuate the valve. The external lever connects the lifting action of the linear actuator to the valve plug through a rotary shaft seal. The Soli-Con Electric Actuator, provided exclusively by Laurence, is a solid-state controlled actuator whose circuitry delivers a direct current to the
coil regardless of the type input voltage. The Soli-Con Actuator incorporates an internal timer to control the inrush current; thus the current is not dependent on the plunger position. This eliminates coil burnouts due to the valve failing to stroke. The timer automatically resets upon de-energization. Due to its unique design and highly reliable Soli-Con Electric Actuator the Laurence Three-way Compressor Air Extraction Pilot Valve has offered years of low cost, maintenance free service in this harsh environment. |
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FALSE START DRAIN |
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Laurence’s solution to this application is a 1" Two-way Rotary Cylinder Actuated Valve. Unlike conventional solenoid actuated valves, this valve offers a metal to metal seat for tight shutoff yet is sensitive to very low differential pressures in the actuator. The rotary seal and actuator are specifically designed with low friction materials to insure that the valve opens without fail at low actuator pressures. Reliable operation at low air pressure differentials and tight shutoff are critical to this application. |
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GAS PURGE SYSTEM BLOCK VALVE |
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Laurence supplies a Two-way Rotary Cylinder Actuated Globe Valve for this application. They have a return spring strong enough to insure that the valve will return to the fail closed position when the turbine trips or in the event of a pilot air or electric failure. A double acting cylinder actuator is used so that the valve can hold closed against a negative differential of gas pressure as a redundant safety measure. This has proven to be a problem with single acting diaphragm actuators which are unable to hold against the negative differential. |
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GAS PURGE SYSTEM VENT VALVE |
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Leslie Controls solution to this application is the Laurence Two-way Rotary Soli-Con Actuated Valve. This valve is well suited for the high temperature environment in which it operates. The minimum shaft rotation and lever arm operation makes this valve a safe, reliable choice for this critical application. |
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ATOMISING AIR BYPASS VALVE |
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Until 1994 Laurence supplied a 3" Two-way Rotary Cylinder Actuated Globe Valve for this application. This valve is still offered in spares or replacement situations. Due to design changes, the valve of choice on new units is a high performance butterfly valve. Laurence now supplies both 4" and 6" wafer valves with a reinforced Teflon seat and pneumatic actuator. |
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FUEL NOZZLE PURGE VALVE |
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The Laurence solution to this application is a Three-way Rotary Cylinder Actuated Valve with indirect lever actuation of the valve plug. The indirect lever action on the valve plug has a mechanical force advantage compared to direct acting solenoid valves. Because the rotary motion that actuates this valve is so slight (20-30 degree arc) it is able to provide reliable operation for a long time period without a requirement for seal maintenance. The cylinder actuator is also designed to provide long service life operating with air temperatures up to 550ºF. |
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LIQUID FUEL STOP VALVE |
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For many years the Laurence Soli-Con Actuated Globe Valve has been used for this application. The Rotary Solenoid Valve has proven to be a reliable economic valve for this service. The strength and reliability of the Soli- Con Electric Actuator make it the safe choice for liquid fuel shutoff applications. |
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TRIP OIL SOLENOID VALVE |
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The Laurence Two-way Rotary Valve is particularly well suited for this application. By design the Laurence poppet-type plug is pushed open by the oil pressure even if the return spring weakens providing an extra measure of safety to this function. Some valves are designed with a closely fitted spring returned cartridge plug. These valves are vulnerable to foreign matter in the oil and binding from temperature distortion. The Laurence Two-way Rotary Valve overcomes these problems with a superior design concept. |
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GENERATOR CONTROL VALVE |
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Leslie supplies a Two-way Rotary Solenoid Actuated Globe Valve for both of these applications. They are FM approved explosion proof valves for Group B applications. These valves are provided with weld end connections to insure the integrity of the installation. The Laurence Two-way Rotary Globe Valve offers a safe, reliable, fast acting solution to a very critical application where a failure to operate properly could result in a catastrophic situation. |
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GAS TURBINE VALVE DIAGRAM |
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