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Details |
Turbine Bypass Valve
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Weir Valve & Control |
Turbine Bypass Valve |
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Modern power plants require advanced design steam turbine bypass valves and systems for optimal performance. These systems allow boilers and heat recovery steam generators to operate independently of the steam turbine. This allows for quick start-up, recovery after a trip and avoids noise problems associated with accidental safety valves lifting. Turbine bypass valves operate under the most severe conditions, reducing pressure by 1500-2000 psig and tempuratures from 1070 DegF to 400 DegF on a fraction of a seconds notice. The process requires a rugged valve design and an engineered systems approach. Blakeborough Controls analyses the entire application. We fit the steam pressure reducing valve with a desuperheating or spraywater injection system that matches the system water pressure(s) and available space for installation.
--Bypass Valves--
Applications:
Turbine Bypass
Process steam temperature control.
Boiler superheater attemperation.
Boiler reheater attemperation.
Combined cycle heat recovery steam.
generator (HRSG) to steam turbine temperature control.
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Cold Reheat Check Valve
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Weir Valve & Control |
Cold Reheat Check Valve |
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Description:
The Atwood & Morrill Cold Reheat Check is a reliable, sturdy valve that protects the High Pressure (HP) Steam Turbine from damage caused by reverse flow during unit trip.
FEATURES
Proven, Swinging Disc Design.
Closure Assisting or Double Acting Air Cylinder.
Smooth Flow Passages for Low Pressure Drop.
Inclined Seat for Short Travel & Quick Operation.
Rugged Construction.
Ability to Withstand Multiple Rapid Closures.
--Check Valves--
Applications:
Rankine and Combined Cycle Power Plants with Reheat.
Prevents Reheat Steam from Returning to Turbine on Trip.
Simplifies Hydrotesting of the Reheater.
Protects the High Pressure Turbine Exhaust from Bypass Steam and Water when the Turbine Bypass system operates.
Isolates High Pressure turbine exhaust when auxiliary steam is supplied to the IP turbine in a combined cycle unit, to synchronize the steam turbine generator or start the gas turbine on a single shaft machine.
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Compressor Check
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Weir Valve & Control |
Compressor Check |
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Description:
"Compressor Check Valve provides protection for the blower or compressor in the event of a reversal of flow."
FEATURES
Air operated, spring loaded closing cylinder assures rapid closure.
A dashpot is provided to prevent disc oscillation or chattering.
Counterweights act to balance the disc reducing pressure loss, allowing the disc, to close by gravity.
| Sizes: 4 "- 60 " |
| Pressure Class: 150 - 900 |
--Check Valves--
Applications:
Fluid catalytic cracker air blower discharge, compressor discharge for ethylene and other processes.
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Control Closure Check Valve
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Weir Valve & Control |
Control Closure Check Valve |
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Description:
"An automatic self regulated check to reduce water hammer effects and piping loads after feedwater line break."
FEATURES
Internal dashpot for self controlled closure.
Slow closure rate reduces pressure surge to acceptable levels.
Reverse flow is checked with throttling effect.
| Sizes: 10 "- 24 " |
| Pressure Class: 600 - 900 |
--Check Valves--
Applications:
Feedwater lines in Nuclear Power Stations.
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Dual Plate Check
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Weir Valve & Control |
Dual Plate Check |
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Description:
"A spring loaded double disc check valve for nuclear applications."
FEATURES
Resilient or metal to metal seating·
Lightweight, small size·
Direct replacement for TRW-Mission, Clow and C&S Valve CO.
Dual Plate Checks.
| Sizes: 2 "- 48 " |
| Pressure Class: 150 - 900 |
--Check Valves--
Applications:
Service water, raw river water, steam service.
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Feedwater Check Valve
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Weir Valve & Control |
Feedwater Check Valve |
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Description:
"A rugged swing check valve for pump or system protection."
FEATURES
Air actuated spring loaded cylinder assures rapid positive closure.
Minimum water hammer with rapid closing.
Low pressure drop and streamlined flow.
| Sizes: 2 "- 24 " |
| Pressure Class: 900 - 2500 |
--Check Valves--
Applications:
Low and high pressure pump discharge.
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Free Flow Check Valve
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Weir Valve & Control |
Free Flow Check Valve |
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Description:
"Positive closing swing check valve for steam turbine protection Low pressure drop."
FEATURES
Air operated, spring loaded closing cylinder assures rapid positive closure.
Activated on turbine trip and heater high water level alarm.
Free swinging disc provides responsive movement in flow stream.
| Sizes: 4 "- 60 " |
| Pressure Class: 150 - 900 |
--Check Valves--
Applications:
Steam turbine extraction lines (Bled Steam) Cold Reheat Line.
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Swing Check Valve
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Weir Valve & Control |
Swing Check Valve |
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Description:
The Atwood & Morrill swing check valve is designed to effectivley prevent reverse flow and is ideally suited for liquid, steam and other gases requiring assured performance, tight shut off and low maintenance.
--Check Valves--
Applications:
Condensate pump discharge.
Heater drains.
Liquid, Steam and Gas check valve.
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Testable Check Valve
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Weir Valve & Control |
Testable Check Valve |
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Description:
"A check valve for emergency cooling systems which can be remotely or manually exercised and tested."
FEATURES
Manual lever or air cylinder actuator permits local or remote testing.
Internal lost motion device allows free swing of disc independent of actuator and packing friction.
Magnetically tripped switches give positive direct indications of disc position.
| Sizes: 2 "- 24 " |
| Pressure Class: 600 - 1500 |
--Check Valves--
Applications:
High and Low pressure core cooling in Nuclear Power Stations.
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Three Way Control Valve
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Weir Valve & Control |
Three Way Control Valve |
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Description:
"A diverting or modulating valve for uninterrupted flow transfer."
FEATURES
In line tee shaped body Flat seat design for tight seal.
| Sizes: 6 "- 24 " |
| Pressure Class: 150 - 2500 |
--Control Valves--
Applications:
High and low pressure feedwater heater bypass.
HRSG Economiser temperature control.
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Main Steam Isolation MSIV's - Nuclear
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Weir Valve & Control |
Main Steam Isolation MSIV's - Nuclear |
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Description:
"Tight shutoff valves for high pressure and high temperature during emergency and faulted conditions."
| Sizes: 16 "- 34 " |
| Pressure Class: 300 - 900 |
--Gate Valves--
Applications:
Wye Globe or Parallel Slide Gate Valve types for Nuclear PWR & BWR Units.
Notes:
Repairs and modifications available
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Parallel Slide Gate Valve
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Weir Valve & Control |
Parallel Slide Gate Valve |
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Description:
"A valve for high pressure, high temperature shutoff applications."
FEATURES
Parallel self-aligning discs provide tight shutoff.
No wedging force required, prevents thermal lockup.
Pressure seal bonnet increases sealing force as pressure increases self aligning disc provides tight sealing.
| Sizes: 2 "- 24 " |
| Pressure Class: 600 - 4500 |
--Gate Valves--
Applications:
On-off service, pump isolation, main steam stop, feedwater heater isolation.
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Globe Valve
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Weir Valve & Control |
Wye Globe Valve |
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Description:
"Wye Globe Valve available as a stop, a stop check or a lift check."
FEATURES
Wye-globe style with streamlined flow passages.
Short stroke gives faster closing or opening.
Tight shut off.
Wear resistant poppet guides.
| Sizes: 6 "- 24 " |
| Pressure Class: 600 - 2500 |
--Globe Valves--
Applications:
Boiler feed pump.
Economiser inlet.
Boiler outlet stop and check.
Combined cycle hot reheat stop check.
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Reheat Isolation Device
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Weir Valve & Control |
Reheat Isolation Device |
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Description:
"RHID provides isolation for testing an open pipeline during normal operation."
FEATURES
Tight shutoff.
No wedging force required, prevents thermal lockup.
Low weight, less costly option.
Low pressure drop.
| Sizes: 8 "- 48 " |
| Pressure Class: 150 - 2500 |
--Reheat Isolation Device--
Applications:
Isolation during hydrostatic testing, wet or dry lay up and chemical cleaning.
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Triple Offset Valves
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Weir Valve & Control |
Tricentric |
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Description:
"Wafer, lug and double flanged butterfly valves for isolation, check, combination stop-check and control."
FEATURES
Bubble tight, zero leakage.
Triple offset, metal seal.
Fire tested.
Bidirectional sealing.
| Sizes: 3 "- 96 " |
| Pressure Class: 150 - 600 |
--Triple Offset Valves--
Applications:
Nuclear
Electric Power Generation
Chemical Hydrocarbon process and industrial services
Hydrocarbon Processing
Cryogenic
Natural Gas
Molten Sulphur
Pulp and Paper
Black Liquor
Lime Mud
etc...
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