The Cla-Val 50M-1 is an unloading valve designed for lubricating oil circuits in propulsion turbine bearing lubrication systems, applicable to both surface vessels and submarines. It is specified for turbine bearings propulsion systems with available sizes from 2½” to 8”, in straight or angle body configurations, and with ASTM B16.5 flanged connections.
The 50M-1 operates as a remote sensing lube oil unloading valve. Remote pressure sensing allows the valve to respond to pressure at a circuit location not necessarily at the valve body. This is critical in lubrication systems where pressure at the bearings, header, or pump discharge must be controlled according to specific unloading logic.
Cla-Val marine documentation lists the 50M-1 as a Lube Oil Unloading Valve (Remote Sensing) for turbine bearing lubrication systems, available in straight or angle pattern, with Union MIL-F1183 or ASTM B16.5 flanged connections.
Prior to procurement, confirm:
Periodic inspection should verify valve response to sensing line pressure changes, pilot passage cleanliness, seat tightness, flange/union leakage, and oil cleanliness affecting hydraulic operation.
Is this a simple isolation valve?
No. It is a pressure unloading valve for lubricating oil circuits.
Is it used for fuel oil?
Not as a standard application. The 50M-1 is intended for lubricating oil systems.
What should be checked on the P&ID?
Valve location, remote sensing line routing, and unloading logic must be verified.
The Cla-Val Model 50M-1 is a Remote Sensing Lube Oil Unloading Valve used in the lubricating system for turbine bearings propulsion systems of surface vessels and submarines.
Available in sizes 2-1/2” through 8”, straight or angle patterns, flanged ASTM B16.5.
