Masoneilan* 78400/18400 Series LincolnLog Valve


The Masoneilan LincolnLog* valve features an axial flow design that uses a tortuous path to distribute pressure drop along the axis of the plug to reduce cavitation. 

It offers multi-stage pressure letdown control with excellent trash tolerance for a long-term solution in critical service applications. The LincolnLog is well suited for high-pressure liquid letdown applications where cavitation and dirty fluids are major concerns. 





Features & Benefits

• Axial stages throttle in unison as the plug strokes maintaining staging ratios at all lift points to control velocity and pressure drop resulting in reduced cavitation trim damage
• Large flow passages enables entrained solids in severe and dirty service fluids to pass through without damage
• Rugged construction for long-term operation in harsh conditions and improved process uptime
• Heavy continuous trim guiding offers smooth operation at all travels
• Single-piece plug and liner components for added reliability and easy field service

• Low part count for efficient operation and reduced inventory and maintenance costs

Application :

The Masoneilan LincolnLog severe service valve is configured for high-pressure liquid letdown applications with pressure drops up to 450 bar (6500 psi) where cavitation and dirty fluids are major concerns including:


• Pump recirculation

• Feedpump start

• Spray water control

• Water reinjection

• Separator letdown

• Boiler feedwatern

• Desuperheater

Regional Considerations
ASME B16.34 design
PED compliant
The LincolnLog offers cavitation control in demanding applications by combining effective design characteristics such as:
• Large flow areas
• Top entry construction
• Advanced trim design
• Minimum number of parts


1" through 12" (25 through 300 mm)


ASME B16.34 Class 600-2500


End Connections:

BWE per ASME B16.25 
Flanged per ASME B16.5


Body Materials: 
Carbon steel 
Stainless steel 


Model 37/38 spring-opposed diaphragm 
Model 87/88 multi-spring-opposed diaphragm 
Cylinder actuators


Multi-stage, cage guided, anti-cavitation trim 
Axial flow technology 
Optional Class VI shut-off


Inherent Characteristics: 





The LincolnLog is available in standard designs to meet a wide range of high-pressure, anti-cavitation applications in both globe and angle body options. The LincolnLog is also available in various optional configurations such as:


• Globe and angle body configurations

• Wide range of body and trim materials

• Soft seat design for bubble tight shut-off

• Cryogenic construction