MODELS 230/330/330S/333S RELIEF VALVES
• Lightweight aluminum construction is resistant to environmental and internal corrosion.
• Repetitively consistent opening pressure.
• Smooth relief action.
• Positive reseating with minimal pressure drop.
• Soft seat option provides repeatable leak-tight performance; allows reduced maintenance costs, multiple cycles with tight shut-off and high seating integrity (Models 330, 330s and 333s).
• Model 230 (non-code) is direct spring-loaded design with synthetic disc insert.
• Model 330 series’ differential mechanism maintains a predetermined seat contact load.
• Full spring load is never imparted to synthetic disc insert (Models 330, 330s and 333s).
• Seat tightness increases as inlet pressure approaches set (opening) pressure.
• Each valve tested and inspected for pressure setting and leakage.
GENERAL APPLICATION
These valves are suitable for use on multi-stage high pressure compressors, intercoolers and aftercoolers; on high pressure receivers and storage bottles, for thermal expansion relief and on breathing air pac and SCUBA recharge compressors.
TECHNICAL DATA
| Connections: | Threaded NPT or SAE |
| Temperature range: | 20 to 185°F (-29 to 85°C) |
| Pressure ranges: | |
| Model 230: | 300 to 1500 psig (20.7 to 103.4 barg) |
| Model 230: | 1000 to 5500 psig (69 to 379.3 barg) |
| Models 330s/333S: | 1000 to 7500 psig (69 to 517.1 barg) |
| Max. back pressure | |
| (Model 333S): | ASME VIII and PED |
 |
NOTE
1. Back pressure reduces set pressure on a one to one basis and reduces capacity. Back pressure in excess of 10% of set pressure is not recommended.
MODELS OVERVIEW
Model 230: Aluminum housing with SS trim. Sidewall discharge.
Model 330: Aluminum housing with SS trim. Sidewall discharge.
Model 330s: AS 330 except SS body.
Model 333s: AS 330S except female NPT side outlet. Pressure-tight cap.
PARTS AND MATERIALS
MODEL 230
| No. | Part Name | Materials |
| 1 | Nozzle[1] | SS SA479-304 |
| 2 | O-ring | PTFE |
| 3 | Bottom disc | SS A582-303 |
| 4 | Insert | Kynar® |
| 5 | Seal | PTFE |
| 6 | Top disc | SS A582-303 |
| 7 | Spring step | Aluminum B211 alloy 2024 T351 |
| 8 | Spring | Steel A231, aluminum or polyester coated |
| 9 | Cap | Aluminum B211 alloy 2024 T351 |
| 10 | Top spring plate | Aluminum B211 alloy 2024 T351 |
| 11 | Compression screw | Aluminum B211 alloy 2024 T351 |
| 12 | Hood | Aluminum B211 alloy 2024 T351 |
NOTE
1. Inlet size G -7/16″ SAE thread equipped with EPDM O-ring seal (not shown).
MODEL 230
MODELS 330 AND 330S
| No. | Part Name | Materials |
| 1 | Nozzle[1] | SS SA479-304 |
| 2 | O-ring | PTFE |
| 3 | Body | Aluminum SB211 alloy 2024 T351[2] |
| 4 | Bottom spring | SS A313-302 |
| 5 | Bottom disc | SS A582-303 |
| 6 | Bottom spring step | Aluminum B211 alloy 2024 T351 |
| 7 | Insert | Kynar® |
| 8 | Seal | PTFE |
| 9 | Top disc | SS A582-303 |
| 10 | Top spring | SS A313-631 or steel A231 aluminum or polyester coated |
| 11 | Cap | Aluminum SB-211 alloy 6061-T6 |
| 12 | Top spring step | Aluminum B211 alloy 2024 T351 |
| 13 | Compression screw | SS A582-303 |
| 14 | Jam nut | SS 18-8 |
NOTES
1. Inlet size G -7/16″ SAE thread equipped with EPDM O-ring seal (not shown).
2. Model 330S, SS SA479-304.
MODELS 330 AND 330S
330, 330S, 333S SOFT SEAT
| No. | Part Name | Materials |
| 1 | Top disc | SS A582 303 |
| 2 | Disc cap | SS A582 303 |
| 3 | Seat | Urethane |
| 4 | Back up ring | PTFE |
| 5 | O-ring | EPDM |
330, 330S, 333S SOFT SEAT
MODEL 333S
| No. | Part Name | Material |
| 1 | Nozzle [1] | SS SA479-304 |
| 2 | O-ring | PTFE |
| 3 | Body | SS SA479-304 |
| 4 | Bottom spring | SS A313-302 |
| 5 | O-ring | NBR |
| 6 | Bottom disc | SS A582-303 |
| 7 | Insert | Kynar® |
| 8 | Seal | PTFE |
| 9 | Top disc | SS A582-303 |
| 10 | Spring step - bottom | Aluminum B211 alloy 2024-T351 |
| 11 | Bonnet | Aluminum SB26 alloy 356-T6 |
| 12 | Top spring | SS A313-631 or steel A231 aluminum or polyester coated |
| 13 | Spring step - top | Aluminum B211 alloy 2024-T351 |
| 14 | Compression screw | SS A479-316 |
| 15 | O-ring | NBR |
| 16 | Jam nut | SS A479-316 |
| 17 | Cap | Aluminum B211 alloy 2024-T351 |
NOTE
1. Inlet size G -7/16″ SAE thread equipped with EPDM )-ring seal (not shown).
MODEL 333S
SPECIFICATIONS
| Size (Model 333S) | Dimensions, in | ||||
| Inlet | Outlet | A | B | C | weight (lb) |
| ¼”, 7/16" and ½” | ½” and ¾” | 2⅞ | 1⅞ | 711/16 |
Dimensions are for reference only.
MODEL 230
MODELS 330 AND 330S
MODEL 333S
SELECTION GUIDE
| Example: | 0230 | - | A | 01 | - | N | C | 1400 |
| Model 0230 0330 330S 333S | ||||||||
| Seat material - Kynar® hard plastic U Urethane soft seat (models 330, 330S, 333S only) | ||||||||
| Inlet A ¼" MNPT C ½" MNPT G 7/16" SAE | ||||||||
| Variation (01 to 99) 01 Catalog standard 01 ½" FNPT outlet (model 333S only) 02 ¾" FNPT outlet (model 333S only) | ||||||||
| Design revision Indicates non-interchangeable revision Dash (-) if original design | ||||||||
| Valve service N Non-code air/gas (model 230 only) K Gas ASME section VII (models 330, 330S, and 333S only) | ||||||||
| Spring material C SS A313-631 or steel A231, aluminum or polyester coated | ||||||||
| Set pressure Model 230 - 300 psig (0300) to 1500 psig (1500) Model 330 - 1000 psig (1000) to 5500 psig (5500) Models 330S and 333S - 1000 psig (1000) to 7500 psig (7500) |
NOTE
Kynar® is a registered trademark of arkema inc.
MODEL 230 CAPACITIES
| SCFM air, 10% accumulation | |
| Set pressure psig | Capacity (non-code) |
| 300 | 14 |
| 500 | 23 |
| 750 | 34 |
| 1000 | 45 |
| 1250 | 56 |
| 1500 | 67 |
MODELS 330, 330S, 333S CAPACITIES
| SCFM air, 10% accumulation | |
| Set pressure psig | Capacity |
| 1000 | 29 |
| 1100 | 32 |
| 1200 | 35 |
| 1300 | 38 |
| 1400 | 40 |
| 1500 | 43 |
| 1750 | 50 |
| 2000 | 58 |
| 2250 | 65 |
| 2500 | 72 |
| 2750 | 79 |
| 3000 | 86 |
| 3500 | 100 |
| 4000 | 115 |
| 4500 | 129 |
| 5000 | 143 |
| 5500 | 158 |
| 6000 | 172 |
| 6500 | 186 |
| 7000 | 201 |
| 7500 | 2115 |
