NLPM: Class 150 And 300 Low Pressure

The centrifugal pump shall be protected by the NLPM series automatic recirculation valve which is completely self-contained and fully automatic via flow activation. The valve protects the pump from reverse flow and prevents overheating during low process demands. Operation of the valve bypass will be modulating so the sum of the main and bypass flow will never be less than the minimum flow requirement of the pump.

Developed for centrifugal pump protection, this unit provides the following features and benefits:

Providing

• Check valve for main flow reverse flow protection
• Main flow sensing element for flow detection
• Bypass modulating flow control for minimum flow pump protection
• Bypass pressure reducing for quiet, safe and dependable operation

Self-powered

The valve operates without air or electric power and is easily installed with three connections.

No Main Flow
The Disc-Piston Assembly acts as a check valve for the main flow, preventing reverse flow through the centrifugal pump. In this position, the Recirculation Control Valve that is part of the Disc-Piston, is fully open, providing the required minimum safe flow.

Modulating Flow
Main flow is less than required minimum safe flow. Main flow, plus bypass flow, equal or exceed the required minimum safe flow.

Main Flow Only
When the main flow is greater than the minimum flow required, the recirculation flow is closed.

Industries
The valve was developed to serve pump protection requirements of the following: Power, Refining, Chemical, Petro-chemical, Pharmaceutical, and HVAC.

Installations
Typical installations include: Transfer, Feeding, Circulating, Boosting, and Loading Pumps.

Usage
Typical uses include centrifugal pumps of ASME configuration, vertical turbine, and canned motor designed.