610-497-2600

MODELS 230/330/330S/333S RELIEF VALVES

Features

• 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 NameMaterials
1Nozzle[1]SS SA479-304
2O-ringPTFE
3Bottom discSS A582-303
4InsertKynar®
5SealPTFE
6Top discSS A582-303
7Spring stepAluminum B211 alloy 2024 T351
8SpringSteel A231, aluminum or polyester coated
9CapAluminum B211 alloy 2024 T351
10Top spring plateAluminum B211 alloy 2024 T351
11Compression screwAluminum B211 alloy 2024 T351
12HoodAluminum 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 NameMaterials
1Nozzle[1]SS SA479-304
2O-ringPTFE
3BodyAluminum SB211 alloy 2024 T351[2]
4Bottom springSS A313-302
5Bottom discSS A582-303
6Bottom spring stepAluminum B211 alloy 2024 T351
7InsertKynar®
8SealPTFE
9Top discSS A582-303
10Top springSS A313-631 or steel A231 aluminum or polyester coated
11CapAluminum SB-211 alloy 6061-T6
12Top spring stepAluminum B211 alloy 2024 T351
13Compression screwSS A582-303
14Jam nutSS 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 NameMaterials
1Top discSS A582 303
2Disc capSS A582 303
3SeatUrethane
4Back up ringPTFE
5O-ringEPDM

330, 330S, 333S SOFT SEAT

MODEL 333S

No.Part NameMaterial
1Nozzle [1]SS SA479-304
2O-ringPTFE
3BodySS SA479-304
4Bottom springSS A313-302
5O-ringNBR
6Bottom discSS A582-303
7InsertKynar®
8SealPTFE
9Top discSS A582-303
10Spring step - bottomAluminum B211 alloy 2024-T351
11BonnetAluminum SB26 alloy 356-T6
12Top springSS A313-631 or steel A231 aluminum or polyester coated
13Spring step - topAluminum B211 alloy 2024-T351
14Compression screwSS A479-316
15O-ringNBR
16Jam nutSS A479-316
17CapAluminum 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
InletOutletABCweight (lb)
¼”, 7/16" and ½”½” and ¾”2⅞1⅞711/16

Dimensions are for reference only.

MODEL 230

MODELS 330 AND 330S

MODEL 333S

SELECTION GUIDE

Example:0230-A01-NC1400
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 psigCapacity (non-code)
30014
50023
75034
100045
125056
150067

MODELS 330, 330S, 333S CAPACITIES

SCFM air, 10% accumulation
Set pressure psigCapacity
100029
110032
120035
130038
140040
150043
175050
200058
225065
250072
275079
300086
3500100
4000115
4500129
5000143
5500158
6000172
6500186
7000201
75002115
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