The Spirax Sarco M33S ISO is an API 6D-compliant full-bore two-piece floating ball valve for on-off isolation in low-temperature natural gas and most hydrocarbon fluid pipelines in OPC refining processes. It is available in DN50-DN200 sizes with ANSI Class 150/300 flanged connections and supports ISO 5211 actuator mounting. Body options include zinc-plated carbon steel or CF8M stainless steel, with an AISI 316 ball and carbon-fiber-reinforced R-PTFE seats.
M33S ISO Full-Bore Two-Piece Floating Ball Valve, Three-Quarter View | Spirax Sarco
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M33S ISO API 6D Full-Bore Two-Piece Floating Ball Valve | Spirax Sarco
Full-bore two-piece floating ball valve with flanged connections for on-off isolation in low-temperature natural gas and hydrocarbon pipelines.
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Specifications
- Valve type
- Full-bore two-piece floating ball valve
- Design standard
- API 6D
- Body design standard
- ASME B 16.34
- Nominal size range
- DN50, DN65, DN80, DN100, DN150, DN200
- Flange pressure class
- ANSI Class 150, Class 300
- Flange standard
- ANSI B 16.5
- Actuator mounting interface standard
- ISO 5211
- Maximum allowable pressure (ANSI 150)
- 20 bar g @ 38°C
- Maximum allowable pressure (ANSI 300)
- 51 bar g @ 38°C
- Maximum allowable temperature
- 260°C @ 0 bar g
- Minimum allowable temperature
- -29°C
- Maximum operating pressure (saturated steam)
- 17.5 bar g
- Leakage rate
- ISO 5208 Rate A / EN 12266-1 Rate A
- Antistatic standards
- ISO 7121, BS 5351
- Body material
- Zinc-plated carbon steel ASTM A216 WCB / stainless steel ASTM A351 CF8M
- Ball material
- Stainless steel AISI 316
- Seat material
- Carbon-fiber-reinforced R-PTFE PDR 0.8
- Material standard
- NACE MR 0175
- Flow coefficient Kv
- DN50:300, DN65:430, DN80:750, DN100:1030, DN150:2410, DN200:4800
- Operating torque
- DN50:75, DN65:120, DN80:190, DN100:250, DN150:720, DN200:1150 Nm
Application scenarios
Isolation of natural gas and hydrocarbon fluid lines in OPC refining and petrochemical processes
Used for on-off isolation of low-temperature natural gas and most hydrocarbon fluid lines in OPC refining and petrochemical processes. This API 6D-compliant full-bore two-piece floating ball valve is expressly specified in the product documentation for isolation service and must not be used for throttling or control.
Selection points
API 6D full-bore two-piece design
The valve is designed in accordance with API 6D and features a full-bore two-piece construction. The product documentation provides Kv values for sizes DN50-DN200 to verify flow capacity during selection.
Rate A leakage performance
Leakage performance complies with ISO 5208 Rate A and EN 12266-1 Rate A.
Steam pressure and temperature limits
The maximum operating pressure for saturated steam is 17.5 bar g. The maximum allowable temperature is 260°C at 0 bar g. These values represent separate operating limits.
Carbon-fiber-reinforced R-PTFE seat
The seat material is carbon-fiber-reinforced R-PTFE PDR 0.8.
ISO 5211 actuator mounting interface
The actuator mounting interface complies with ISO 5211, allowing compatibility between the actuator and valve interfaces to be verified.
Antistatic and NACE material standards
The antistatic design complies with ISO 7121 and BS 5351, and the materials comply with NACE MR 0175.
Installation & maintenance notes
Isolate both sides, fully depressurize, and allow to cool before servicing
Before removing or servicing the valve, isolate both the upstream and downstream sides, safely release the internal pressure to atmospheric pressure, and allow the valve to cool to ambient temperature. Even if the pressure gauge reads zero, residual process fluid may remain inside the valve. Exercise caution to prevent fluid discharge or contact injuries during removal.
FAQ
How does the M33S ISO full-bore ball valve operate?
This two-piece floating ball valve uses its full-bore construction to provide rapid isolation. When closed, the ball seals against the seats to stop fluid flow. It must not be used for throttling or control.
What media is this model suitable for, and what temperature-related selection criteria apply?
The product is designed for low-temperature applications involving natural gas and most hydrocarbon fluids in OPC refining and petrochemical processes. The applicable temperature and pressure must be checked against the design conditions table, and final selection must account for the fluid properties and operating conditions.
How is compatibility between the DN size and flange connection determined?
The size range is DN50, DN65, DN80, DN100, DN150, and DN200. Flange options are ANSI 150 or ANSI 300, and the face-to-face dimensions comply with the applicable standards. Select the specific model in accordance with the applicable ISO installation requirements.
What certificates and compliance documentation are available, and can they be obtained when ordering?
An EN 10204 3.1 certificate is available for the product. If required, specify it when placing the order so that it can be issued. Certificate requirements must be confirmed at the ordering stage.
What important precautions apply to installation and maintenance?
Installation and maintenance must follow the instructions supplied with the valve, including the inspection and maintenance requirements for components such as the seals and stem seals. The applicable parts list and maintenance information can be obtained for the specific model if required.