LLP™Turbine Bypass Valve for Low Pressure Bypass Applications

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LLP™ delivers superior pressure reduction and temperature control, low noise and vibration, and fast response in a complete compact steam conditioning control valve.

Pressurized seat pilot plug assembly provides shutoff of an unbalanced plug with the low actuator force requirements of a balanced plug

The Compact Comprehensive Solution

The LLP™ by CCI is the leading low pressure turbine bypass valve for

combined cycle and process steam plants. The LLP™ is designed in both

angle and globe body configurations and easily fits into most existing

piping arrangements. The LLP™ may be installed in any orientation

without the need for additional support for the upper structure. Featuring

an integrated spring-loaded spraywater nozzle desuperheating manifold

at the valve outlet, the LLP™ minimizes the downstream desuperheating

distance, making it extremely compact for all types of low pressure

steam conditioning applications including advanced turbine bypass-to-

condenser applications with short pipe runs.

Spring-Loaded Nozzle Desuperheating

LLP™ desuperheating features integral spring-loaded water-injection

nozzles that optimize water-injection over a wide range of flow rates at low

pressures. With a rangeability of up to 50:1, the spring-loaded water-injection

nozzles vary the water flow as required to achieve the fine water droplet size

needed for atomization. The spring-loaded water-injection nozzle design

provides the smallest water droplet size possible without steam assist.

Pressurized Seat Pilot Plug Assembly

The LLP™ uses the CCI Pressurized Seat Pilot Plug Assembly to provide

repeatable ANSI/FCI 70-2 Class V Shutoff as a standard feature.

The design features a pilot and main plug, and a piston ring balance seal.

The piston ring allows a small, controlled leak of pressure from the valve

inlet to the bonnet cavity. When the control valve is closed and the pilot

plug is seated, the piston ring allows controlled shutoff pressure to build in

the bonnet cavity above the plug, acting to close the valve and providing

exceptional shutoff. With the CCI Pressurized Seat Pilot Plug Assembly, the

actuator only needs to provide sufficient thrust to seat the pilot plug against

the pilot seat in the main plug.

When a signal to open the control valve is received, the actuator lifts the

stem, opening the pilot seat. The pilot rapidly exhausts the bonnet cavity

pressure, and the plug assembly is now balanced. As the stem continues

to move in the opening direction, the shoulder on the stem engages the

retaining plate on the main plug, which lifts the main plug off the main seat.

The actuator only needs to provide sufficient thrust to lift the balanced plug.

Water-injection nozzle provides smallest water droplet size possible

Good atomization at wide range of flow rates

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Highly reliable, fast, accurate pneumatic and hydraulic actuators provide superior system control.

Table 1: Factors Influencing Actuator Selection

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Accurate Control

CCI’s long history of developing advanced technology valves and actuation

systems for severe service and safety-related applications has led to the

development of the most reliable actuation systems available today. CCI has

supplied pneumatic and hydraulic actuation systems for over 30 years and

has an extensive installed global base. Our pneumatic actuation systems can

deliver stroke speeds of less than one second while maintaining accurate

resolution and control.

The selection of pneumatic or hydraulic actuation is primarily a function of

valve design for the particular application as well as customer preference. A

comparison of the factors influencing actuator selection is given in Table 1.

Improve Plant Efficiency—Eliminate Lost Steam

During normal operation, any leakage past a turbine bypass valve means lost

revenue.

g Steam that does not go through the turbine does not generate electricity or

revenue for the plant.

g Money spent generating the steam is lost.

g Steam leaking past a valve seat could erode the seat and cause an increase

in the leakage rate and maintenance downtime.

g Steam leaking past a valve to condenser could reduce the efficiency of the

condenser by deteriorating the vacuum and raising the condenser temperature.

The CCI LLP™ Turbine Bypass Valve comes standard with a pilot trim designed

for ANSI/FCI 70-2 Class V Shutoff, providing dependable, repeatable shutoff and

exceptional seat tightness for long periods of time with high pressure differentials.

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Top Entry Design

Minimizes service time.

Option of Open Port or Low Noise Small- Drilled-Hole Cage Trim

Globe Body Configuration Optional

Pressurized Seat Pilot Plug Design

Provides Class V Shutoff.

Spraywater Manifold System

Multiple attemperation injection points with single

customer water connection.

Spring-Loaded Spraywater Nozzle Desuperheaters

Mounted directly to outlet, eliminating need for

additional piping sections.

Superior Atomization

Valve Performance Characteristics (% Cv vs. % Stroke)Valves are custom characterized to accommodate a wide range of variables.

Linear Modified Equal Percentage Equal Percentage

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No trim parts are welded or screwed into the valve body

Low Noise Small-Drilled-Holed Cage

Reduces noise level to below 85 dBA

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Use this checklist to evaluate the benefits of the LLP™ design.

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A custom solution based on 40 years of experience.

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1. All dimensions are in inches except ( ) are in millimeters.2. Dimension A is for valves with spray nozzles, and dimension A* is for valves without spray nozzles.3. Dimension E* is for a hydraulic actuator.4. Buttweld per ANSI B16.25 and mating pipe schedule.5. Valve may be installed in any orientation. The upper structure does not require additional support.6. Per customer design requirements.7. ANSI 600# RF flange.

Table 2: Dimensional Information

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Angle Configuration Globe Configuration

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Technical specifications and materials.

1. Rangeability may vary with process conditions. Consult with factory.

2. Hydraulic actuator available upon request.

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1. Alternate materials available per customer’s specific design requirements.

* With saturated steam, to avoid pipe erosion and liquid drop-out due to droplet impingement, bends should be avoided.

** Saturated steam conditions cannot be controlled through downstream temperature measurement. Feed-forward/enthalpy control recommended.

† All dimensions are in feet except ( ) are in meters.

Table 4: Capacity and Performance Data

Table 3: Materials Table 5: Recommended Desuperheating Lengths Using Spring-Loaded Nozzles

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DRAG is a registered trademark of CCI.©2002 CCI 387 3/02 3M

Contact us at:info@ccivalve.com

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Throughout the world, companies rely on CCI to solve their severe service control valve problems. CCI has provided custom solutions for these and other industry applications for more than 40 years.

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