Straight Globe Valve

Specification

Bellows Seal High Pressure Cast Steel Globe Valve

I. Product Overview

NWV bellows seal flanged globe valves are engineered for toxic, flammable, and high-purity media, featuring dual sealing from bellows and packing to eliminate external leakage. Constructed from WCB cast steel, 304/316 stainless steel, and CF8/CF8M, they cover DN15-DN150 (1/2″-6″) with PN16-PN40 (1.6MPa-4.0MPa), suitable for -29℃~425℃. The valve regulates flow via stem movement, offering linear flow characteristics for precise control in chemical, pharmaceutical, and power industries with strict leakage requirements.

II. Core Technical Parameters

Specifications & Pressure-Temperature Range

Nominal Diameter: DN15/20/25/32/40/50/65/80/100/125/150 (1/2″-6″)

Pressure Class: PN16/PN25/PN40 (1.6MPa/2.5MPa/4.0MPa)

Temperature Range: -29℃~200℃ (NBR bellows), -40℃~425℃ (stainless steel bellows)

Materials & Sealing System

Body Bonnet: WCB cast steel (A216 WCB), 304/316 stainless steel (A351 CF8/CF8M)

Bellows: 316L stainless steel (wall thickness 0.25-0.5mm), 2-4 layers, fatigue life ≥10,000 cycles

Seat Seal: PTFE (standard), PPS (high-temp), hard alloy (abrasion-resistant)

Connection: Flanged (ASME B16.5, GB/T 9113), RF/FF face

Actuation & Operation

Actuation: Manual (with gearbox option), electric (IQ series actuator), pneumatic (double-acting cylinder)

Flow Characteristic: Linear, turndown ratio 100:1

Protection Grade: IP67 (electric actuator), Ex d IIB T4 (explosion-proof option)