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Fisher® Power Solutions

Control valves engineered to improve your plant performance.

6 | Fisher® Power Solutions

The Condensate System

Condensate Pump Recirculation Valve

As one of the most critical pieces of equipment in a
power plant, the condenser provides a high vacuum

environment where the turbine output and efciency is

maximized and the exhaust is condensed to water. It is a
condensate collection point for the steam generator.

From the condenser, the condensate ows into

the condensate pump and then through the other
components in the condensate system.

In order to protect pumps from overheating
and to prevent cavitation, Fisher
pump recirculation valves withstand varying
outlet conditions by providing the recommended

minimum ow of condensate through the pump.

®

condensate

PRODUCT FEATURES

nAdvanced sealing technology prevents seat damage and eliminates condensate leakage.
n High rangeability protects the pump from damage and provides excellent system control.
n Anti-cavitation trim reduces noise and vibration for extended service life.
n Characterized cage provides low-ow cavitation protection during initial operation and necessary ow as

pressure rises.

nOptional trim allows passing of 19 mm (.75 inch) particulate.
n Optional reducers engineered to meet piping requirements.

Deaerator Level Control Valve

The deaerator serves many functions in a power
plant. Its primary function is to minimize entrained
oxygen in the feedwater. It must also provide

additional heat to the feedwater owing to the

boiler and store an adequate amount of feedwater to

provide sufcient suction head to the feedpump. This

is a challenging application and requires a valve that

can handle cavitating, low ow rates during startup

and allows for high capacity at low pressure drops
during normal operation.

In order for the deaerator to serve all of its functions

properly and efciently, consistent deaerator level

must be maintained.

Fisher deaerator level control valves maintain a
consistent deaerator level while handling extreme

ow rates and minimizing the effects of cavitation.

Fisher® Power Solutions | 7

PRODUCT FEATURES

nAdvanced sealing technology provides tight shutoff and maintains consistent deaerator level during startup.
n High turndown handles extreme flow rates.
n Anti-cavitation trim reduces noise and vibration for extended service life.
n Characterized cage provides low-ow cavitation protection during initial operation and necessary ow as

pressure rises.

nOptional trim allows passing of 19 mm (.75 inch) particulate.
n High thrust, low maintenance pneumatic actuator.

8 | Fisher® Power Solutions

The Feedwater System

Boiler Feedwater Startup and Regulator Valve

In the normal range of plant operation, the boiler

feedwater regulator experiences high ow rates with

low differential pressure. However, during startup,

this valve experiences low ow rates with very

high differential pressure, which can cause severe
cavitation damage. Some feedwater systems are
designed using one valve to handle startup
and normal operating conditions. Others are
designed using a separate small startup valve to

handle low ow, cavitating conditions and a second
larger valve to handle high ow rates required for

normal operation.

Fisher feedwater startup and regulator valves are
engineered to eliminate cavitation during initial
operation and provide the rangeability required
for smooth transition from startup through full
load operation.

HP/IP Drum Level Control Valve

The high pressure (HP) and intermediate pressure
(IP) drum level control application is fairly moderate
during typical plant operation. However, during
startup the pressure drop across the valves,
particularly the HP drum level control valve, can
produce damaging cavitation.

Fisher HP and IP drum level control valves are
designed to eliminate cavitation during startup
while providing the rangeability required for smooth
transition to normal operation.

PRODUCT FEATURES

nAdvanced sealing technology provides tight shutoff and extends service life.
n High turndown handles extreme flow rates.
n Characterized cage provides low-ow cavitation protection during initial operation and necessary

ow as pressure rises.

nOptional trim allows passing of 19 mm (.75 inch) particulate.
n One valve solution: offers anti-cavitation protection during low flow, high pressure drop

startup, and unrestricted high flow during low pressure drop, full load conditions.

n Two valve solution: offers a dedicated startup valve to handle cavitating conditions in parallel with

a larger standard trim valve, handling full load conditions.

n Pneumatic piston actuator provides highly accurate step positioning and stable valve response.

Boiler Feedpump Recirculation Valve

The boiler feedpump recirculation valve faces some
of the toughest conditions of any control valve in a
power plant. The boiler feedpump takes its suction
from the deaerator at relatively low pressure, and
increases the pressure to approximately 10% above
the main steam pressure. During startup or low load

conditions, ow to the boiler may not be adequate
to meet the minimum ow requirements of the

boiler feedpump.

Fisher boiler feedpump recirculation valves protect

the feedpump by ensuring adequate ow is passing

through the pump at all times. They are engineered
to handle extreme cavitation caused by high
temperatures and pressure drops. Where issues

with ow accelerated corrosion exist, Fisher boiler

feedpump recirculation valves allow high levels of
entrained particulate to pass.

Fisher® Power Solutions | 9

PRODUCT FEATURES

nControls pressure drops up to 586 bar (8,500 psi).
nAdvanced sealing technology provides tight shutoff and extends service life.
n High turndown handles extreme flow rates.
n Anti-cavitation trim reduces noise and vibration for extended service life.
n Characterized cage provides low-ow cavitation protection during initial operation and necessary ow as

pressure rises.

nOptional trim allows passing of 19 mm (.75 inch) particulate.
n Globe and angle body designs available.
n Pneumatic piston actuator provides highly accurate step positioning and stable valve response.

10 | Fisher® Power Solutions

The Main Steam System

Superheat Spray Valve

Varying load requirements cause varying steam
temperatures. In order to ensure optimum heat rate and to
protect the steam turbine, the steam temperature in the
superheat sections of the boiler must be controlled.

Fisher superheat spray valves accurately control the
amount of water injected into the steam attemperator or
cooler, providing optimal main steam temperature control
and stability. This prevents damage to the turbine and

results in efcient turbine operation.

Reheat Spray Valve

To increase the thermal efciency of a steam generator

and improve the overall heat rate of a unit, a reheater
is incorporated in the power cycle. This is a particularly
challenging application and requires a reheat spray valve
to maintain precise reheat temperature control.

Fisher reheat spray valves provide optimal hot reheat
steam temperature control and high rangeability, while
minimizing the damaging effects of cavitation.

Sootblower Valve

When ring fuels such as coal, oil, or other waste

products, degradation of the boiler tubes becomes a
concern. Deposits from the combustion process can
collect on the heat exchanging tubes, which reduces

thermal efciency and may cause operational problems.

Fisher sootblower valves provide steam to the
sootblower system to remove deposits from the boiler
tubes while withstanding high pressure, high vibration,

and thermal cycling to maintain unit efciency.

PRODUCT FEATURES

n High rangeability for excellent system control.
n Advanced sealing technology provides Class V shutoff and extends service life.
n Customized sootblower trim reduces noise and withstands heavy vibration.
n Anti-cavitation trim reduces noise and vibration.

HP/IP/LP Turbine Bypass Spraywater Valve

Turbine bypass spraywater valves serve a similar function
to that of the other spraywater valves in a power plant.
Rather than precisely controlling temperature, these valves
provide adequate water to the desuperheater to bring the
steam temperature to near saturation temperature. This
occurs when turbine bypass applications are discharging
into the condenser.

When HP bypass applications discharge to cold reheat,
adequate water must be provided to reduce the main
steam temperature to cold reheat temperature. Similarly,
for hot reheat bypass applications discharging to LP steam,

sufcient water must be provided to reduce hot reheat

temperature to LP steam temperature.

Fisher HP, IP, and LP turbine bypass spraywater valves
provide accurate steam temperature and mimic actual
process conditions of a normally operating power plant,
providing precise water injection.

Fisher® Power Solutions | 11

PRODUCT FEATURES

PRODUCT FEATURES

n Optimized in combination with turbine bypass valves.
n High rangeability for excellent system control.
n Advanced sealing technology provides Class V shutoff and extends service life.
n Anti-cavitation trim reduces noise and vibration.

12 | Fisher® Power Solutions

The Main Steam System

HP/IP/LP Turbine Bypass Valve

Turbine bypass systems are essential for the exible

operation of combined cycle power plants, as well

as large modern coal red plants. Turbine bypass

systems permit operation of the steam generator
independently of the turbine during startup,
shutdown, and plant upset conditions. They must be
adequately sized to meet the needs of normal startup
and shutdown, as well as transients. They must also
operate at acceptable noise levels.

Fisher turbine bypass systems enhance operational

exibility during transient operating conditions. As a

result, startup times are reduced and equipment life
and overall plant availability is increased.

PRODUCT FEATURES

n Custom designs meet piping arrangements.
n Noise abatement technology and rugged cage guiding reduces noise levels to provide smooth and

stable operation.

n Variable geometry spray nozzles ensure complete mixing and rapid vaporization of spray water for efcient

temperature control.

n Repeatable Class V shutoff at temperatures up to 593° C (1100° F).
n Enhanced designs engineered to withstand high thermal cycling applications.
n High rangeability for excellent system control.
n Pneumatic piston actuator for highly accurate step positioning and stable valve response.

Deaerator Pegging Steam Valve

The deaerator pegging steam valve provides steam
that gives positive pressure to the deaerator or
IP and LP drum to prevent air from being drawn into
the feedwater system during plant start up. Steam
from this valve also heats the feedwater. Steam may
come from a low pressure package boiler or the plant
main steam line.

Fisher pegging steam valves ensure pressure
reduction and noise attenuation, regardless of
steam source.

Steam Seal Regulator Valve

Steam seal regulator systems have several valves that
experience varying conditions. The steam seal feed
valve takes full main steam pressure down to 0.2 - 0.3
bar (3-5 psig). This extreme pressure drop presents
several challenges including noise and vibration.

Fisher® Power Solutions | 13

Fisher steam seal regulator valves contain noise
abatement trim to combat to these tough challenges.

PRODUCT FEATURES

n Noise abatement technology reduces the harmful effects of noise and vibration.
n Optional in-line diffuser for additional noise abatement.
n Rugged design engineered to withstand full main steam pressure drop.
n Advanced sealing technology provides Class V shutoff and extends service life.
n Pneumatic piston actuator for highly accurate step positioning and stable valve response.

14 | Fisher® Power Solutions

Sky Vent System

Sky Vent Valve

Sky vent valves may operate during startup and
shutdown of the heat recovery steam generator,
bypassing main steam around the steam turbine to
the atmosphere.

Fisher sky vent valves are engineered to withstand
the full pressure drop that occurs as the valve dumps
high pressure and temperature steam directly to
the atmosphere. They operate quietly during dump
operation and provide tight shutoff during normal
operation, preventing valuable steam leakage.

PRODUCT FEATURES

n Advanced sealing technology provides tight shutoff and extends service life.
n Noise abatement technology reduces the harmful effects of noise and vibration.
n Components engineered for high temperature service.

Desuperheaters

Ring Style Attemperator

As with any superheated steam cycle, the
temperature of the superheat needs to be controlled
to ensure that it does not exceed the material
limits of the steam turbine and boiler. Temperature
control is accomplished by use of an attemperator
or desuperheater that injects a controlled amount of

cooling water into the superheated steam ow.

Fisher ring style attemperators are designed to work
in conjunction with supporting superheat and reheat
control valves to provide optimal steam temperature
and stability. This prevents damage to the turbine
and extends service life.

Fisher® Power Solutions | 15

PRODUCT FEATURES

n Flexible designs from NPS 8 to 48.
n Optional liner prevents thermal cracking caused by water impingement on pipe.
n High turndown for high efciency.
n Variable geometry spray nozzles ensure complete mixing and rapid vaporization of spray water for efcient

temperature control.

16 | Fisher® Power Solutions

Desuperheaters

Insertion Style Attemperator

Fisher insertion style attemperators are designed
to work in conjunction with supporting superheat

and reheat control valves. Proven Fisher anti-ashing

nozzles provide the required amount of water needed
for accurate temperature control in the steam turbine
and boiler. They are suitable for temperatures up to
593° C (1100° F) and standard pressure classes up to
ANSI 2500.

PRODUCT FEATURES

n Vortex shedding technology minimizes vibration and extends service life.
n NPS 3, 4, and 6 available for pipes up to 152 centimeters (60 inches) diameter.
n Water ange connection offers high rangeability for excellent system control.
n Solutions available for a wide range of steam velocities.
n Variable geometry spray nozzles ensure complete mixing and rapid vaporization of spray water for efcient

temperature control.

Heater Drain System

HP/LP Feedwater Heater Normal Drain Valve

Proper functioning of the heater drain system is
critical to maintaining optimum heat rate and
protecting the turbine from possible water induction.
The feedwater heater normal drain valves must
provide stable feedwater heater level control.

The Fisher HP and LP feedwater heater normal
drain valves provide level control optimized to the

characteristics of each specic feedwater heater and
prevent the damaging effects caused by ashing.

HP/LP Feedwater Heater
Emergency Drain Valve

Feedwater heater emergency drain valves normally
operate closed, and tight valve shutoff is critical.
A leaking emergency drain can have a 2-5-plus
megawatt negative impact on plant output.

Fisher® Power Solutions | 17

Fisher feedwater heater emergency drain valves
operate quickly and properly to maintain consistent
feedwater heater level when called upon and prevent

damage incurred by ashing.

PRODUCT FEATURES

n Body materials eliminate erosion caused by ashing.
n Linear valve trim optimized to each feedwater heater eliminates noise and cavitation.
n Advanced sealing technology provides Class V shutoff and extends service life.
n Precise level control without oscillation.
n Globe, angle, and rotary designs available.

18 | Fisher® Power Solutions

Fuel Gas System

Fuel Control Valve

The primary function of the fuel control valve is
to provide fuel to the combustion turbine. The
challenge of this application is that the fuel control
valve must be designed to work in conjunction with
other fuel control and air valves supporting operation
of the combustion turbine. Depending upon the age
and frame size, the number of fuel control valves can
vary from one to many and may differ in size.

Fisher fuel control valves are designed to work in
conjunction with supporting fuel and air control

valves to improve efciency of the gas turbine. They

eliminate start up issues related to inaccurate level
of the control valve. Their quick response enhances a
turbine-driven generator’s ability to respond to step
changes.

PRODUCT FEATURES

n Proven, optimized designs customized to the specic need of combustion turbine application.
n Rotary valve design provides high rangeability for excellent system control.
n Globe and angle valves available.
n 3-way valves for fuel control in older turbine designs.
n Custom trim designs available for extended service life.

Fisher® Power Solutions | 19

Capabilities Serving You For the Life of Your Plant

If it’s your responsibility to select the right valve
for a tough critical power application, you need
every advantage you can get. Not just now, but in
the future, too. From application expertise to valve
repair, you can count on Emerson for quality, service,
and expertise for the life of your plant.

Application Expertise

We understand that control valves are an investment.
You want to speak one-on-one with someone who
knows your tough application needs. The Emerson
sales network has extensive application experience
and partners with you to engineer the most suitable
products for your application.

At Emerson, we’ve built our reputation not just on
our breadth of reliable Fisher products, but also on
our people and their dedication to service. Wherever
you are, there is an Emerson sales engineer ready to
discuss your control needs.

Manufacturing

Wherever your power plant is located and wherever
you need to be, Fisher control valves are fully
supported. Fisher manufacturing plants are
located in every world area and are equipped with
sophisticated manufacturing technology, ensuring
that operations utilize the most up-to-date product
information. This means that each Fisher product

meets design specications and perform as intended,

regardless of where its individual components were
manufactured.

Global Reach, Local Service

We have the most extensive global network of

eld specialists anywhere. Whether it’s startup and

commissioning, turnaround planning and execution,
valve repair or parts, Emerson understands the
relationship between its prompt service and support

and your protability. With facilities at strategic

locations around the world, Emerson valve service
centers give you fast turnaround of emergency and
routine valve repairs. These services free up your
maintenance personnel for other activities, while
proving to be timesaving and cost effective.

Experience our full breadth of reliable Fisher control valves and
instruments for your tough power applications. To contact your

local sales ofce, visit www.EmersonProcess.com/Fisher

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Emerson Process Management

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