4 Frame Piston Pump
Industrial Duty, Long Lasting, Dependable Pumps
Model: 331
This triplex (three piston rods) positive displacement, reciprocating piston pump is constructed with 316 stainless steel manifolds, 304 stainless steel valve assemblies, and un-chromed 304 stainless steel sleeves and cylinders. Multiple piston cup and seal configurations are available with NBR (Buna-N) O-rings.
The lower RPM belt drive design provides strong inlet suction and long-lasting pump and seal life.
Technical Specifications
| Max Flow | 4 gpm / 15.1 lpm |
| Max Pressure | 1200 |
| Inlet Port Size | 1/2" NPT(F) |
| Discharge Port Size | 3/8" NPT(F) |
| RPM | 1070 |
| Drive Type(s) | Belt, Clutch |
| Material | 304 Stainless Steel |
Product Information
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- Tech Bulletin 002 - Inlet Pressure vs. Water Temperature
- Tech Bulletin 016 - Bac-cup Piston Assemblies
- Tech Bulletin 017 - Discharge Manifold Shims
- Tech Bulletin 020 - Quiet Valves-Piston Pumps
- Tech Bulletin 024 - Lubrication of Lo-Pressure Seals
- Tech Bulletin 025 - 4 Frame 4-Screw Crankcase Cover
- Tech Bulletin 026 - Threaded Oil Gauge and C/C Cover
- Tech Bulletin 030 - Flanged Nut-Discharge Manifold
- Tech Bulletin 034 - Servicing Crankcase Section - Ball Bearing Models
- Tech Bulletin 036 - Identifying Your Pump
- Tech Bulletin 038 - Blue Dot Seal and Wick-Piston Pumps
- Tech Bulletin 053 - Liquid Gasket for Seal and Valve Servicing
- Tech Bulletin 074 - Torque Chart
- Tech Bulletin 083 - Winterizing a Pump
- Tech Bulletin 095 - Galling Prevention
- Tech Bulletin 134 - Piston and Plunger Pump Crankcase Capacities
