Max-Air

Air-powered rack and pinion rotary actuators, described by Max-Air as built for precise action and reliable long-life operation.

Use it whenUse it as the default pneumatic actuator for quarter-turn valves in ordinary plant service. Start here and only move off it if torque, environment or space forces you to.

The rack and pinion design in stainless steel construction rather than aluminum.

Use it whenUse it in washdown, coastal, chemical-splash or otherwise corrosive environments where an aluminum housing will chalk and pit. Costs more; the payback is not repainting or replacing actuators.

Compact rack and pinion actuators with polymer housings.

Use it whenUse it on small valves in corrosive or washdown areas where you want corrosion immunity without the cost or weight of stainless. Good fit for water treatment and food plants.

A limited-rotation aluminum actuator giving 180 degrees of travel rather than 90.

Use it whenUse it on three-way and diverter valves that have to rotate a half turn. A standard 90 degree actuator physically cannot drive these, and this is the part people forget when automating a diverter.

Heavy-duty rotary actuators, air or fluid powered, for high-torque applications.

Use it whenUse it when the valve torque exceeds what a rack and pinion unit will deliver -- large ball valves, high differential pressure, high-friction seats.

The heavy-duty design in a hydraulic-powered version.

Use it whenUse it when the torque requirement is beyond what plant air pressure can achieve in a reasonable actuator size, and hydraulic supply is available.

Scotch yoke pneumatic actuators for heavy-duty service.

Use it whenUse it on large or high-pressure valves where you want the scotch yoke's high breakaway torque right at the start and end of travel -- which is exactly where a stuck ball or a loaded seat needs it.

Max-Electric's intelligent electric actuator for ordinary locations.

Use it whenUse it when you want on-board configuration, diagnostics and modulating control rather than a simple open-close motor. Worth it on valves you will tune or monitor.

The industrial-class electric actuator for ordinary locations.

Use it whenUse it as the workhorse electric on-off actuator where there is no plant air and no hazardous area classification.

A multi-function electric actuator.

Use it whenUse it when one unit needs to cover several control modes or signal types rather than being ordered for a single fixed duty.

An electric actuator with a spring return, for ordinary locations.

Use it whenUse it when the valve must drive to a defined safe position on power loss. Standard electric actuators hold last position -- if that is unacceptable for the process, this is the family, not an accessory.

The industrial electric actuator built for hazardous, classified locations.

Use it whenUse it when the installation is in a classified Class and Division area. This is not an option on the ME -- it is a different family, so identify the area classification before selecting.

A spring-return electric actuator for hazardous, classified locations.

Use it whenUse it when you need both a defined fail position and hazardous-area construction -- the combination that catches people out late in a project.

Solenoid valves that switch air to a pneumatic actuator through a NAMUR mounting interface.

Use it whenUse NAMUR mounting whenever the actuator has a NAMUR pad -- it bolts directly to the actuator with no tubing between them, which removes the most common leak and failure point on an automated valve.

Solenoid valves with inline NPT porting rather than a NAMUR pad.

Use it whenUse it when the actuator has no NAMUR interface or when the solenoid must be mounted remote from the actuator -- for example to keep the electrical away from a hot or wet location.

Proportional positioners with feedback, for modulating actuator control.

Use it whenUse it any time the valve has to sit at an intermediate position instead of just open or closed. Required on control ball and butterfly valves.

Discrete switch boxes reporting valve open and closed position.

Use it whenUse it when the control system needs confirmed position rather than a commanded state -- standard on interlocked, safety-related and remotely operated valves.

Air preparation for pneumatic actuators.

Use it whenUse it on every air-actuated valve. Dirty or wet plant air is the single most common cause of premature actuator and solenoid failure and this is the cheapest possible fix.

Devices that increase air delivery to an actuator.

Use it whenUse it when a large actuator strokes too slowly through a small solenoid, or when a fast trip time is required on a big valve.

Manual handwheel gear operators, available with manual override capability.

Use it whenUse it when a valve is too large to lever by hand, or when an automated valve must remain operable during an air or power outage.

The mechanical interface between actuator and valve, to the ISO 5211 standard.

Use it whenUse it when the valve is not direct mount. Get the ISO pad size and stem dimensions right on the order -- a mismatched adapter is the usual reason an automated valve arrives and will not go together.

Tubing and electrical termination hardware for automated valve packages.

Use it whenUse it to finish a package consistently rather than improvising in the field.

Delta T's butterfly range: ductile iron and stainless resilient-seated valves, a data-center series, a marine series, double and triple offset high-performance valves, a patented C Series control design for cavitation reduction, and the T5X for powder and abrasive service. The 800 and 900 Series are listed in Classes 150, 300 and 600.

Use it whenUse resilient seated (050/650) for clean low-pressure isolation; 800 double offset when a resilient seat is wearing out from cycling; 900 triple offset when you need tight metal-seated shutoff at temperature; C Series where cavitation is damaging valves; T5X on powders and abrasives.

Sesto's ball valve range, split between industrial cast bodies for standard service and forged bodies for high-pressure, cryogenic, severe service and modular block-and-bleed configurations.

Use it whenUse industrial cast for ordinary process isolation at Class 800 and below; move to forged when the service is high pressure, cryogenic, severely erosive, or when you need double block and bleed in a single modular body instead of three valves and spool pieces.