Brochure

21000 Series High Performance Globe Style Control Valves | 3
Model 87/88
Spring Diaphragm Actuator
• Compact Multi-Spring Design Reduces
Stem-Side Loading
• Field-Reversible Construction
• Rolling Diaphragm Helps to Reduce Friction and Wear
• Constant Effective Area for Smooth Linear Control
• Four Sizes Available Covering Large Thrust Range
• Four Standard Spring Ranges for Wider Application
Envelope
• Side-Mounted Handwheel Option
Heavy Top Guiding
• Larger Post Guide Area for Increased Stability
• Positioned Outside of Direct Fluid Flow Path
• Offers More Reliable Control Performance
Various Trim Options
• Single- and Double-Stage Low Noise and
Anti-Cavitation Trim
• Standard Hardened Trim (Stellited or
Equivalent Trim)
• Quick-Change or Threaded Seat Rings
• Reduced Capacities and Low-Flow Trims
• Equal Percentage and Linear Characteristics
• UOP Lockhopper Trim
• Soft-Seat Design
Design Flexibility
• Multiple End Connections
• Various Materials
• Angle Body Configuration
• Bellows Seal Design
• Piston Actuation Option
• Extension Bonnets
• Cryogenic Configuration
• Low-Emissions Packing
• DIN Version Available
Key Features