Palm & Push Button Valves 11 & 12 Series

Product Overview

The ROSS Controls covers three families of manually actuated palm and push button directional control valves designed for pneumatic machine control panels, operator stations, and pilot circuit applications in industrial automation. The product line includes the 12 Series Flush and Mushroom Pushbutton valves, the 11 Series Palm Button valves with poppet construction, and the 12 Series Heavy-Duty Palm Button valves combining robust poppet construction with a large-format ergonomic palm button actuator.

The 12 Series Flush and Mushroom Pushbutton valves use spool and sleeve construction in a compact inline body, providing 3/2 normally closed or normally open directional control at 1/8 and 1/4 inch port sizes. The spool construction is well-suited for general-duty machine signaling where cycle rates are moderate and air quality is maintained. Both flush and mushroom button styles are available in green and red actuator colors for operator station coding.

The 11 Series Palm Button valves use poppet construction with side and bottom mounting flanges for direct machine frame mounting. Available in 2/2 and 3/2 normally closed configurations with 1/4 inch NPT or G ports, these valves provide reliable pilot signal generation for downstream pressure-actuated valves. The poppet design tolerates contaminated air supplies better than the spool variants and covers a wider temperature range extending down to -10F (-23C).

The 12 Series Heavy-Duty Palm Button valves combine the compact 12 Series mounting envelope with poppet valve internals and a large-diameter high-strength plastic palm button rated for sustained operator force without fatigue. Available in 2/2 and 3/2 normally closed configurations at 1/4 inch ports, these valves are the preferred choice for operator safety applications where the larger palm contact area reduces the chance of accidental actuation by a single finger. Ring guard accessories are available to further restrict actuation to deliberate palm contact.

Key Engineering Features

• Three Distinct Actuator Families - Flush pushbutton for panel-flush machine interface aesthetics, mushroom button for prominence in emergency or caution applications, standard palm button (11 Series poppet) for general operator interface, and heavy-duty palm button for applications requiring large-area contact and enhanced accidental actuation protection.
• Poppet and Spool Construction Options - The 11 Series and 12 Series Heavy-Duty Palm Button use poppet valve internals for superior dirt tolerance, reliable sealing, and extended service life. The 12 Series Flush and Mushroom Pushbutton use spool and sleeve construction for compact inline dimensions and straightforward replacement in existing 12 Series footprints.
• Green and Red Button Color Coding - All 12 Series pushbutton and heavy-duty palm button variants are available in green (start/open) and red (stop/close) actuator colors, supporting OSHA-compliant and ANSI-standard color coding for industrial operator panels and machine controls.
• Side and Bottom Mounting Flanges - The 11 Series and 12 Series Heavy-Duty Palm Button valve bodies include integrated side and bottom mounting flanges with 0.34 inch (8 mm) diameter bolt holes on a 2.00 inch (51 mm) by 2.00 inch (51 mm) pattern, enabling direct machine frame and panel mounting without separate mounting brackets.
• Normally Closed or Normally Open by Piping - The 12 Series spool valves allow normally closed or normally open circuit function to be achieved simply by swapping the inlet connection between ports, without changing the valve model or actuator. This provides application flexibility with a single part number.
• Low Actuator Force Requirements - The 12 Series pushbutton and selector switch valves feature a valid operation distance of 0.22 inches (5.5 mm) and require only 7.7 lb (3.5 kg) force for valid actuation, suitable for repeated actuation in high-cycle production environments without operator fatigue.
• Ring Guard Accessory for Heavy-Duty Palm Button - Ring guard model 278B30 is available as an accessory for heavy-duty palm button valves to further restrict actuation to deliberate downward palm force, reducing the risk of accidental valve actuation from lateral contact in congested operator stations.
• Compact Physical Dimensions - The 12 Series spool body measures 1.46 inches (37 mm) length by 3.9 to 4.6 inches (99 to 118 mm) width by 1.26 inches (32 mm) height, allowing dense panel layouts. The 11 Series poppet body is 1.82 inches (46 mm) by 2.76 inches (70 mm) by 3.27 to 3.38 inches (83 to 86 mm) high.
• NPT and G Thread Options - All Series models ship with NPT threads as standard. G (BSPP) threaded variants are available on any model by adding a D prefix to the model number (e.g., D1121A2001 for the 2/2 palm button with G ports).
• Filtered Air Compatibility - All Series valves are designed for use with filtered compressed air. The poppet-based 11 Series and heavy-duty palm button variants tolerate moderate air contamination without immediate failure; the spool-based 12 Series flush and mushroom variants benefit from cleaner air supply to prevent spool sticking.

Technical Specifications

General Specifications

Temperature Ratings

The 12 Series spool-based Flush and Mushroom Pushbutton valves have a higher minimum temperature limit of 40F (4C) due to the spool and sleeve construction. The 11 Series and 12 Series Heavy-Duty Palm Button poppet valves operate down to -10F (-23C). For temperatures below 40F (4C), compressed air must be free of water vapor.

Important: For media temperatures below 40F (4C), compressed air must be dry to prevent ice formation inside the valve body and on the spool or poppet sealing surfaces.

Flow Performance Data

Cv values represent the average flow coefficient at rated conditions. Response time for manual valves is calculated as Response Time (ms) = M + (F x V) where M is taken as zero for manually actuated valves in most practical applications. F values: 11 Series palm button F(1-2) = 2.5, F(2-3) = 3.2; Heavy-Duty Palm Button F(1-2) = 2.0, F(2-3) = 2.3. V is downstream volume in cubic inches.

Certifications & Compliance

Typical Applications & Industries

Machine Control Panels and Operator Stations

• Flush pushbutton valves for panel-mounted machine start/stop controls where the actuator must sit flush with the panel surface to prevent inadvertent actuation from objects resting against the panel.
• Mushroom button valves for emergency stop or caution positions in operator panels where the larger actuator contact area and raised profile provide visual prominence and rapid actuation under stress.
• Heavy-duty palm button valves at two-hand control stations requiring simultaneous palm contact from both hands before machine cycle initiation, in compliance with OSHA and ANSI machine safety guarding requirements.
• Color-coded operator panels using green and red button variants for start and stop functions respectively, meeting ANSI/NFPA 79 color convention requirements for industrial machinery.

Remote Pilot Signal Generation

• 11 Series and 12 Series heavy-duty palm button valves as air pilot signal sources for larger solenoid or air pilot directional control valves with port sizes from 1/4 to 2-1/2 inch, allowing manual control of high-flow circuits from compact pilot valve stations.
• Machine interlock circuits where manual confirmation of a safe state is required before automated sequences can proceed, using the pushbutton or palm button as a permission signal source.
• Safety circuit pilot signals for pneumatic presses, punches, and forming machines where operator initiation of the cycle requires deliberate actuation of a palm-type operator to prevent inadvertent machine cycle starts.

Automation and Assembly Manufacturing

• Fixture clamping and unclamping in manual assembly operations where the operator controls clamp cylinder actuation with a push button valve, freeing both hands during the load and unload sequence.
• Part ejection and transfer systems in semi-automated assembly lines where operator-initiated pushbutton signals trigger pneumatic ejectors, pushers, and diverters.
• Packaging and cartoning lines at manual inspection or rejection stations where the operator buttons bypass products or activate reject gates.
• Pneumatic test stands where the operator initiates pressurization and vent sequences for leak testing, function testing, and flow measurement using pushbutton valve controls.

General Industrial and Process Applications

• Air motor and rotary actuator control at manual operator stations where cycle frequency does not justify solenoid control but a dedicated manual valve provides more reliable and consistent operation than an inline shutoff.
• Pneumatic indexing mechanisms at manual assembly workstations where the operator controls advance and return strokes of index cylinders for part positioning during manual assembly tasks.
• Chemical and process industry applications where the poppet construction and -10F to 175F operating range accommodate environments unsuitable for spool-type valves with tighter contamination tolerances.

Ordering and Model Number Configuration

The Series uses model numbers that encode the valve series, construction type, revision level, port size code, button type, and button color. Understanding the structure allows direct model number construction for all standard configurations.

Standard models ship with NPT threads. For G (BSPP) threads, add a D prefix to the model number (e.g., D1121A2001 for 11 Series 2/2 palm button with G ports).

The 12 Series spool valves (flush and mushroom pushbutton) allow NC or NO function to be achieved by selecting the appropriate inlet port, without requiring a different valve model.

Ring guard accessory model 278B30 is available for heavy-duty palm button valves to restrict actuation to deliberate downward palm force.

All 11 Series and 12 Series Heavy-Duty Palm Button valves ship spring return (normally closed). No detented or maintained-contact options are standard in these families.

Accessories

Ring Guard for Heavy-Duty Palm Button

Ring guard model 278B30 mounts over the heavy-duty palm button to restrict actuation to downward palm force only, preventing accidental side contact from tools, body parts, or nearby equipment from activating the valve.

Warning: The ring guard is an anti-accidental-actuation device, not a safety guard. Machine safety circuit design must comply with applicable machine safety standards independent of ring guard installation.

Exhaust Silencers

Aluminum silencers for 1/4 inch exhaust ports to reduce noise at operator station locations. Rated to 150 psig maximum operating pressure.

Warning: Exhaust silencers must not be allowed to become plugged with contamination. A restricted exhaust port creates back pressure that reduces valve shifting speed and can cause erratic actuator behavior.

Related Products & Accessories

• Selector Switch Valves (257 Series) - 12 Series detented selector switch valves for maintained on/off circuit selection. https://www.rosscontrols.com/en/series/257-selector-switch-valves
• Lever Valves (258 Series) - 11, 31, and 36 Series toggle lever, lever, and heavy-duty hand lever valves for panel and machine mounting. https://www.rosscontrols.com/en/series/258-lever-valves
• Cam and Plunger Valves (260 Series) - 11 Series mechanical cam roller and plunger valves for automated machine-actuated pilot circuit control. https://www.rosscontrols.com/en/series/260-cam-plunger-valves
• Pendant Valves (255 Series) - 1 to 6 lever pendant control valve assemblies for air hoist and overhead crane applications. https://www.rosscontrols.com/en/series/255-pendant-valves
• Exhaust Silencers - Aluminum silencers for 1/4 inch exhaust ports on pushbutton and palm button valve operator stations. https://www.rosscontrols.com/en/series/90-silencers

Frequently Asked Questions (FAQ)

Q: What is the difference between flush pushbutton and mushroom button valves?

A: Both are 12 Series spool and sleeve valves with identical internal construction and flow performance. The flush pushbutton actuator sits at or below the panel surface level to reduce the risk of accidental actuation by passing objects. The mushroom button actuator has a larger, raised profile that is easier to locate and depress under stress and is commonly used for operator caution or stop functions where visual prominence and rapid actuation are priorities.

Q: Can the 12 Series pushbutton valves be wired for normally open operation?

A: The 12 Series spool valves allow NC or NO circuit function through piping, not wiring - these are pneumatic devices. By connecting the compressed air supply to port 3 instead of port 1, the valve shifts from normally closed to normally open operation. No model change is required. Consult ROSS application data for port numbering and piping diagrams.

Q: What is the difference between the 11 Series palm button and the 12 Series heavy-duty palm button?

A: The 11 Series palm button uses a standard aluminum pushbutton actuator on a poppet valve body with side and bottom mounting flanges. The 12 Series heavy-duty palm button uses a larger high-strength plastic palm button contact area on a poppet valve body, also with mounting flanges. The heavy-duty palm button provides a larger contact area for palm actuation, reducing fatigue in high-cycle operations and providing more resistance to accidental finger actuation. The 12 Series HD Palm also offers green and red color options; the 11 Series does not.

Q: What is the ring guard and when should it be used?

A: Ring guard model 278B30 is an accessory that mounts around the heavy-duty palm button to restrict actuation to direct downward palm force. It prevents accidental actuation from lateral contact with tools, workpieces, or body parts in congested operator stations. Ring guards are recommended when the palm button valve is installed near moving machine elements or in areas of high traffic where incidental contact is a risk.

Q: Why do the 11 Series poppet valves operate to lower temperatures than the 12 Series spool valves?

A: The 12 Series spool and sleeve construction uses a close-fitting aluminum spool in a bored aluminum sleeve. At temperatures below 40F (4C), differential thermal contraction between the spool and sleeve can reduce clearances and increase spool stiction, potentially causing sluggish or missed shifts. The 11 Series poppet design seats against a resilient seal under spring force, maintaining reliable operation down to -10F (-23C) because the sealing mechanism does not depend on close sliding fit clearances.

Q: What air filtration is required for the 12 Series spool valves?

A: ROSS recommends filtered compressed air for all Series valves. For the 12 Series spool and sleeve construction, 5-micron or finer filtration is recommended to prevent particulate contamination from depositing in the spool bore and causing spool stiction. The 11 Series and heavy-duty palm button poppet valves are more tolerant of moderate contamination, but fine filtration is still recommended for maximum service life.

Q: Can pushbutton valves be used as two-hand safety control devices?

A: Two adjacent heavy-duty palm button valves can be used in a two-hand control circuit requiring simultaneous actuation of both palms. However, ROSS palm button valves are manual directional control valves, not certified two-hand control devices per ISO 13851 or EN 574. Safety circuit design for two-hand control applications must comply with applicable machine safety standards and may require ROSS safety products or third-party certified control components in addition to or instead of standard palm button valves.

Q: What are the port assignments for 2/2 and 3/2 valve configurations?

A: For 2/2 valves: Port 1 is the inlet (supply) and Port 2 is the outlet (to actuator or pilot device). There is no integral exhaust port on 2/2 valves. For 3/2 valves: Port 1 is the inlet, Port 2 is the outlet (to actuator), and Port 3 is the exhaust. In the spring-returned (normally closed) position, Port 1 is blocked and Port 2 is connected to Port 3 exhaust. When actuated, Port 1 connects to Port 2 and Port 3 is blocked.

Q: Are the series valves suitable for hydraulic applications?

A: No. All Series palm and push button valves are designed for filtered compressed air service only. They are not rated for hydraulic fluid, water, or other liquid media. Using these valves with liquid media will damage the seals and internal components.

Q: What is the expected service life of pushbutton and palm button valves?

A: With properly filtered compressed air and normal operating conditions, ROSS manual valves provide long service life. Specific cycle life data is not published for the series, but the poppet design of the 11 Series and 12 Series Heavy-Duty Palm Button inherently resists wear from contamination. Service kits with replacement seals and internal components are available from ROSS for field refurbishment when wear is observed.

Q: Can I mount the 11 Series valve in any orientation?

A: The 11 Series and 12 Series Heavy-Duty Palm Button valves include side and bottom mounting flanges, allowing both vertical and horizontal mounting. There is no required orientation for valve function. However, mount the valve so that the actuator button faces the operator at a comfortable ergonomic height and angle for the intended operation.

Q: What does the B suffix mean in model numbers like 1223B2001?

A: The B in ROSS model numbers such as 1223B and 1221B denotes a revision level or design level designation within the series. It identifies the current production configuration of the heavy-duty palm button valve family. When ordering replacement parts or service kits, include the full model number including the revision letter to ensure correct part identification.

Installation & Maintenance Guidelines

• Mount the valve body using the side or bottom mounting flanges with appropriate fasteners for the mounting surface material. Verify that the valve body does not flex or distort when the mounting bolts are torqued, as body distortion can affect spool or poppet alignment.
• Orient the valve so that the actuator button or palm button faces the operator at an ergonomically comfortable height, typically 35 to 44 inches above floor level for standing operators per ANSI/HFES 100 ergonomic guidelines.
• Connect port 1 to the compressed air supply and port 2 to the downstream actuator or pilot device. For 3/2 valves, connect port 3 to a silencer, muffler, or to atmosphere. Ensure exhaust is directed away from operator faces and sensitive equipment.
• For 12 Series spool valves intended for normally open operation, connect the compressed air supply to port 3 and connect the outlet load to port 2. Port 1 becomes the exhaust in this piping configuration.
• Install a 5-micron inline filter immediately upstream of all 12 Series spool valves to prevent spool stiction from particulate contamination. The 11 Series and heavy-duty palm button poppet valves benefit from filtration as well, though the poppet design is more tolerant of moderate contamination.
• Supply pressure must not exceed 150 psig (10 bar) at port 1. Verify that the upstream regulator output is set below this limit before connecting the valve to the compressed air system.
• Minimum supply pressure for reliable pilot signal generation is 5 psig (0.3 bar). Operation below this threshold may produce insufficient downstream pressure for reliable actuation of pilot-operated downstream valves.
• For cold weather installations where ambient temperatures may approach the minimum rating (40F for 12 Series spool valves, -10F for 11 Series and 12 Series Heavy-Duty poppet valves), ensure that the compressed air supply is dried to a dewpoint below the minimum expected operating temperature.
• After installation, cycle each valve several times manually and verify that the actuator returns freely to the spring-returned position when released. Sluggish or incomplete return indicates a blocked exhaust port, insufficient spring force, or contamination in the valve bore.
• Check all port connections for air leakage with a leak detection solution before placing the machine in service. Leakage at inlet port 1 in the normal position indicates poppet or spool seat wear. Leakage at exhaust port 3 with the valve actuated indicates worn poppet or spool seals.
• Do not use thread sealant tape in a manner that allows tape fragments to enter the valve port. Use liquid thread sealant rated for compressed air service on NPT threads, or apply PTFE tape carefully to avoid introducing fragments into the air circuit.
• Inspect button actuators and operator knobs at regular maintenance intervals for cracking, deformation, or wear. A damaged button actuator can change the actuation force or prevent full valve stroke, leading to incomplete valve shifting or unreliable pilot signal generation.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all Series palm and push button valves, covering defects in material and workmanship from the date of purchase.

Technical support is available through ROSS Controls USA at (800) 438-7677 or through ROSS global offices in Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Service kits with replacement seals and internal components are available for field refurbishment of all Series valves. Provide the complete model number including revision letter when ordering service kits.

For dimensional drawings, CAD models, and complete product specifications, visit the ROSS Controls product page at rosscontrols.com or contact your authorized ROSS distributor.

Product Catalog - Manual Palm Push Button Valves: https://www.rosscontrols.com/en/documents/3883?filename=Manual_Palm_Push_Button_Valves_ROSS-MV-PB_EN.pdf

Installation Instructions - 11 & 12 Series: https://www.rosscontrols.com/en/documents/52?filename=ROSS_11_12_Series_Mechanical_and_Manual_Valves_Installation_Instructions_SS105.pdf