Model 31-N

Description

The Model 31-N is a compact service regulator designed expressly for use in the process industry where gas needs to be controlled down to the Inches - W.C. range. Body is available in cast carbon steel or stainless steel materials only. Interior wetted trims for corrosive applications is standard. Design is nonrelieving.

Inlet Design Pressure

• Up to 150 psig (10.3 Barg)

Outlet Pressure

• Maximum Operating Outlet Pressure is 16" WC (400mm H2 O)
• Maximum Design Pressure is 50 psig (3.45 Barg)
• Minimum Operating Outlet Pressure is 2.0" W.C. (50mm H2 O)

Line Sizes

• 1/2" (DN15)
• 3/4" (DN20)
• 1" (DN25)
• 1-1/2" (DN40)
• 2" (DN50)

End Connections

• Standard : NPT female
• Option-30: 150#RF flanges
• Option-32: Extended plain end nipples
• Option-34: 14" Face to Face Flange Dimension

Material Combinations: Body / Spring Chamber

• CS/SST/CS
• SST/SST/CS

CS = Cast Carbon Steel

SST = Cast Stainless Steel

Features

• Body Material: Carbon steel or stainless steel.
• Trim Material: Choice of four combinations of ma te rials, including 316L SST wetted.
• Setpoint Pressure Range: Multiple springs covering 2.0 - 16.0" W.C. (50 - 400mm H2 O).
• Accurate Regulation: Optimum internals design to ensure rapid response to sudden load changes.
• Multiple Configurations: Valve is factory assembled in four standard positions. Actuator section can be rotated 360° around the valve’s throat.
• Valve Seat Design: One-piece, molded, resilient seat self-locks, self-aligns, and is easily field maintained. Design minimizes pressure build above setpoint at lockup (no flow) conditions. Buna-N, fluorocarbon elastomer, silicone or TFE seat material. Loading ring allows field adjustment of “boost effect”.