Model 988
SKU#:
Model 988
Description
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" through 2" (DN20–DN50). End connections available are NPT, socketweld or flanged.
Design Pressure
Maximum Allowable Working Pressure: Up To 1480 psig (102 Barg)
Line Sizes
- 3/4" (DN20)
- 1" (DN25)
- 1-1/2" (DN40)
- 2" (DN50)
End Connections
- Female NPT – All sizes and materials only. F-to-F dimensions per ISA S75.08-03.
- Socket Weld – All sizes; CS and SST body materials only. F-to-F dimensions per ISA S75.08.03.
- Flanged – All sizes and body materials. Separable Type; standard is CS flanges and CS split rings, optional SST.
Body Materials
- Carbon Steel
- Stainless Steel
- H-C: Hastelloy C
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 positioners.
| Line Size | 3/4" (DN20), 1" (DN25), 1.5" (DN40), 2" (DN50) |
|---|---|
| End Connections | FNPT, Flanged, Socket Weld |
| Service | Gases, Liquids, Steam |
| Body Material | Carbon Steel, Stainless Steel, Hastelloy |
