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Automation of sanitary valves and proper pump selection are essential for efficient, hygienic processing. This guide covers the most common types of sanitary pumps, valve actuators, and selection criteria for food, dairy, pharmaceutical, and biotech applications.
| Pump Type | Best Applications | Key Advantages | Limitations |
|---|---|---|---|
| Centrifugal | Low-viscosity liquids, CIP return, transfer | High flow rate, CIP-cleanable, low cost | Not self-priming, limited viscosity range |
| Positive Displacement (Rotary) | High-viscosity products, shear-sensitive | Consistent flow, handles viscous media, self-priming | Higher cost, pulsation (some types) |
| Diaphragm | Shear-sensitive products, slurries, abrasive media | Gentle pumping, dry-run capable, handles solids | Pulsating flow, lower pressure capacity |
| Peristaltic (Hose) | Sanitary transfer, small batches, sampling | No seals or valves in product path, easy to clean | Hose replacement cost, limited pressure |
Pneumatic Actuators (Air-Operated): The most common type for sanitary valves. Reliable, cost-effective, and suitable for wet environments. Available in spring-return (fail-safe) and double-acting configurations. Quarter-turn (90°) for butterfly and ball valves; linear for diaphragm and angle seat valves.
Electric Actuators: Preferred when compressed air is not available or for modulating control. Offer precise positioning (0.5-1% accuracy) and are available with various control signals (4-20 mA, 0-10 V, Modbus). ONEMO supplies both pneumatic and electric actuators factory-mounted to match your valve specifications.
Torque Required: Valve type, size, and operating pressure determine required torque. Butterfly valves need lower torque than ball valves.
Fail-Safe Position: Spring-return actuators close (or open) the valve on loss of air pressure — critical for safety applications.
Control Signal: On/off (solenoid) for simple isolation; modulating (4-20 mA) for proportional control.
Environment: Wash-down areas require NEMA 4X or IP67 rated actuators. Consider temperature, humidity, and chemical exposure.
Automated valves are essential for CIP/SIP systems. Pneumatic actuators with position feedback allow the control system to verify valve position during cleaning cycles. Key considerations: all actuator materials must withstand CIP chemical exposure; actuators should be rated for the ambient temperature during SIP cycles; position feedback sensors must be sealed for wash-down environments.
ONEMO supplies factory-mounted actuator packages for all valve types (butterfly, ball, check, diaphragm, plug) with pneumatic or electric actuators sized to your specific requirements. Every actuator-valve assembly is factory-tested before shipment. Technical specifications and mounting drawings are available for all configurations.
Spring-return actuators use a spring to return the valve to a default position (normally closed or normally open) when air pressure is removed. Double-acting actuators require air pressure for both opening and closing, meaning the valve stays in its last position if air pressure is lost. Spring-return is recommended for safety-critical applications.
Yes, most sanitary valves can be retrofitted with actuators if the mounting pattern is standardized (ISO 5211 is the common standard for quarter-turn valves). However, we recommend factory-mounted assemblies for optimal alignment and performance. ONEMO can provide actuator retrofit kits for most valve models.
For on/off control: 24 VDC solenoid valves are standard for pneumatic actuators. For modulating control: 4-20 mA analog signal is the industry standard, providing proportional valve positioning. Digital communication protocols (Modbus, Profibus) are available for integrated control systems.
Yes. ONEMO pneumatic actuators are available with NEMA 4X (IP67) rating, making them suitable for wash-down environments in food and dairy plants. Electric actuators with IP67 rating are also available for environments where hose-down cleaning is routine.
3-A Sanitary Standards — Pump and valve design for food/dairy
EHEDG Guidelines — Hygienic equipment design
ISO 5211 — Valve actuator mounting dimensions
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