The Model 988 is a globe-style, pneumatic control valve designed primarily for general and chemical service. The valve's body/trim materials are available in WCB/316L SST, CF3M/316L SST, or CW-12MW/Hast. C constructions. Standard trim is metal seated design giving Class IV shutoff. Optional composition seat design gives Class VI shutoff. Available in body sizes 3/4" thru 2" (DN20–DN50). End connections available are NPT, socketweld or flanged.

Applications
Designed primarily for corrosive chemical fluids in throttling services.May also be applied as a general service control valve for utilities services – steam, air, oil, water, industrial gases, etc. The minimum seat/plug/stem material is 316L SST to maximize corrosion resistance. May be applied up to 1480 psig (102.Barg) pressure limit, or 450°F (232°C) temperature limit as a standard unit; up to 750°F (399°C) with optional high temperature construction.

Features

• All wetted trim components of 316L SST or Hastelloy C.
• Dual stem guiding: – improved shutoff, – increased packing life, – maximized stability.
• Standard internally live-loaded V-ring packing.
• Multiple packing designs to meet reduced fugitive emission levels.
• Flow-to-open design for increased: – rangeability, – stability.
• Quick change trim.
• High pressure drop capability, up to 1480 psid (102.0 Bard).
• Multiple reduced trim selections.
• Equal percent or linear characterization.
• External corrosion protection.
• Face-to-Face dimensions - ISA 75.08.07 (“Long Pattern”).
• Standard Actuator compliant with IEC 60534-6-1 for mounting standardized positioner