Pendant Valves 1 to 6 Lever Options

Product Overview

The ROSS Controls Pendant Control Valves are ergonomically engineered manual pneumatic directional control valves available in configurations from 1 to 6 lever options, purpose-built for applications requiring hands-on directional air control at elevated or remote operator stations. These valves are the standard solution wherever an operator must command an air hoist, air motor, cylinder, vacuum gripper, or counterbalance cylinder from a hanging pendant station on an overhead crane bridge, monorail, or jib arm.

Two product lines cover the full range of pendant applications. The 2025A Series uses a rigid dial mount with variable control design optimized for precise, feathered positioning where modulated flow is as important as on/off switching. The 3900A Series provides a rigid dial mount with integrated hand lever, giving the operator a tactile, positive-engagement lever action. Both lines use poppet valve construction for superior dirt tolerance and long service life without the wear mechanisms inherent in spool-type valves.

Valve configurations include single 3/2 (single-acting cylinder and pilot applications), dual 2/2 (load balancer and lift assist applications), dual 3/2 (air hoist, double-acting cylinders, bidirectional air motor control), triple 3/2, and quad 3/2 (air hoist with air trolley, multi-function pendant stations). For high-flow applications demanding rapid actuator response, the high-flow variants with 3/8 inch and 1/2 inch NPT ports deliver Cv values up to 2.0 per valve section.

For design engineers integrating material handling automation, the series offers the broadest configuration range in pendant valve technology: the same poppet core in 1 through 6 lever assemblies, NPT and G thread options, protective covers for accidental actuation prevention, and a temperature range extending to -40F that accommodates cold storage and outdoor crane installations without modification.

Key Engineering Features

• Poppet Valve Construction - Provides superior dirt tolerance compared to spool-type designs. The poppet seat seals positively under both actuated and spring-returned conditions, eliminating the bypass leakage and contamination sensitivity that limits spool valves in real-world industrial environments.
• Variable Stroke Control - The lever travel modulates airflow proportionally, allowing operators to feather actuator speed for precise positioning of loads, critical in pick-and-place, balancer, and hoist applications where inch-by-inch control prevents load swing and product damage.
• 1 to 6 Lever Configurations - Covers the full range from a single 3/2 pilot signal source up to a quad 3/2 for simultaneous hoist and trolley directional control in a single pendant housing, reducing operator station complexity and cabling.
• High-Flow Variants up to Cv 2.0 - The high-flow 2025A Series with 3/8 and 1/2 inch NPT ports delivers Cv 2.0 per section, enabling fast actuator response and reduced cycle times compared to the standard-flow 3900A Series (Cv 0.24 to 0.73 per section).
• Extended Temperature Range -40F to 175F - Operates reliably from -40F (-40C) to 175F (80C) ambient and media temperatures without modification, accommodating outdoor bridge cranes in arctic climates, cold storage facilities, and high-ambient manufacturing environments.
• Optional Protective Cover - Available on select 2025A high-flow models to shield levers from accidental actuation in congested production environments or outdoor installations where inadvertent contact is a risk.
• NPT and G (BSPP) Thread Options - Standard models ship with NPT threads. G-threaded variants are available by adding a D prefix to the model number (e.g., D2025A3232), enabling direct integration with metric-threaded pneumatic systems without adapters.
• Feathering Capability - The variable stroke design allows operators to achieve graduated flow control, critical in load balancer applications where smooth, low-velocity movement is needed to prevent oscillation of suspended loads.
• Hanging and Rigid Dial Mount Options - I-bolt pendant hanging mount and rigid dial mount configurations are both available, enabling pendant stations on overhead chains, cable suspensions, or fixed mounting brackets on machine frames.
• ROSS/FLEX Engineering Design Services - Custom pendant configurations combining different valve functions, emergency stop integration, special port sizes, corrosion-protection coatings, brass or stainless steel materials, and air balancer designs are available through ROSS rapid-response engineering.

Technical Specifications

General Specifications

Temperature Ratings

The Series pendant valves operate across the full -40F to 175F range in both ambient and media conditions. For media temperatures below 40F (4C), supply air must be free of water vapor to prevent ice formation inside the valve body.

Important: For temperatures below 40F (4C), compressed air must be dry. For temperatures below -40F (-40C), consult ROSS Controls for application-specific guidance.

Flow Performance Data

Flow performance for representative Series configurations. High-flow variants (2025A Series with 3/8 and 1/2 inch ports) provide Cv 2.0 per section. Standard-flow variants (3900A Series and 2025A rigid dial mount with 1/8 and 1/4 inch ports) provide Cv 0.24 to 0.73 depending on flow path.

Response Time Formula: Response Time (ms) = M + (F x V). M is the minimum response constant (taken as zero for manually operated valves in most practical applications). F is the fill or exhaust factor per flow path. V is the downstream volume in cubic inches.

Certifications & Compliance

Typical Applications & Industries

Material Handling and Overhead Lifting

• Air hoist directional control using dual 3/2 pendant configurations for raise and lower functions. The variable stroke allows precise load positioning and soft starts to minimize hoist shock loads.
• Overhead bridge crane and monorail hoist control where the pendant station must withstand industrial environments including dust, oil mist, and mechanical vibration from crane travel.
• Air balancers and lift assist devices in assembly operations where feathering control allows operators to counterbalance workpiece weight and position components with minimal physical effort.
• Quad 3/2 configurations for simultaneous hoist raise/lower and trolley forward/reverse from a single four-lever pendant station, eliminating the need for multiple separate pendant assemblies.
• Air winches and cable tensioning systems requiring bi-directional flow control with variable speed for gradual load acceleration and controlled deceleration.

Pneumatic Cylinder and Actuator Control

• Double-acting cylinder control for clamping, pressing, and positioning operations where the operator needs direct, tactile control over stroke direction and speed without relying on solenoid logic.
• Single-acting cylinder extension using the single 3/2 configuration for part feeding, punching, and ejection applications where manual initiation is preferred over automated sequencing.
• Remote pilot signal generation for larger air pilot directional control valves with port sizes up to 2-1/2 inch, enabling manual override of automated circuits without electrical control.
• Vacuum cup pick-and-place operations where the operator controls vacuum application and release timing for manual material transfer at workstations.

Air Motors and Articulating Arm Systems

• Bidirectional air motor speed and direction control using dual 3/2 or 3/2 plus flow control in a single pendant for torque tool, mixer, and conveyor drive applications.
• Articulating arm and tool balancer positioning systems where the operator guides the arm end effector and the pendant controls pressurization and exhaust for movement.
• Cold storage and freezer facility material handling at temperatures down to -40F where standard solenoid valves and electronic controls are unreliable or require special heating enclosures.

Automotive and General Manufacturing

• Assembly line ergonomic tooling including nut runners, press tools, and assembly fixtures controlled from hanging pendants at operator stations, reducing repetitive motion injuries.
• Metal stamping and forging assist devices where the pendant controls counter-balance cylinder pressure for operator-guided part manipulation near press tooling.
• Outdoor crane installations at ports, steel mills, and lumber yards where the -40F to 175F rating eliminates seasonal valve failure in extreme climates.

Ordering and Model Number Configuration

The Series covers two primary product lines: the 2025A Series (rigid dial mount with variable control and high-flow options) and the 3900A Series (rigid dial mount with hand lever). Model numbers encode valve type, port size, lever count, and protective cover options.

Standard models ship with NPT threads. For G (BSPP) threads, prefix any model number with D (e.g., D2025A3232).

High-flow 2025A Series variants (3/8 and 1/2 inch ports) provide Cv 2.0 per section and are available with or without protective lever covers.

Standard-flow 3900A Series and 2025A rigid dial mount variants (1/8 and 1/4 inch ports) are available in 1-lever through 4-lever configurations.

Custom configurations including special materials, corrosion protection, emergency stop integration, and non-standard port arrangements are available through ROSS/FLEX Engineering Design Services.

High-Flow 2025A Series Model Selection (3/8 and 1/2 inch NPT)

Standard-Flow 2025A and 3900A Series Model Selection (1/8 and 1/4 inch NPT)

Accessories

Exhaust Silencers

Aluminum exhaust silencers are available for 1/4 inch port sizes to reduce exhaust noise at pendant valve stations. Rated to 150 psig maximum operating pressure.

Warning: Exhaust silencers must have flow capacities at least as great as the exhaust capacities of the valves. A clogged or undersized silencer creates back pressure that can interfere with valve shifting and actuator speed control.

ROSS L-O-X Energy Isolation Devices

ROSS L-O-X and L-O-X with EEZ-ON devices provide lockout/tagout-compliant energy isolation for pendant valve circuits during maintenance. These devices are energy isolation products, not emergency stop devices.

Remote Air Pilot Directional Control Valves

ROSS offers a full range of remote air pilot directional control valves with port sizes from 1/4 inch to 2-1/2 inch for applications where the pendant valve serves as the pilot signal source rather than the primary flow path.

Related Products & Accessories

• Palm and Push Button Valves (256 Series) - 11 and 12 Series manual pushbutton and palm button valves for machine-mounted operator control stations. https://www.rosscontrols.com/en/series/256-palm-push-button-valves
• Pedal and Treadle Valves (259 Series) - 36 and RM Series foot-operated poppet valves for hands-free machine control. https://www.rosscontrols.com/en/series/259-pedal-treadle-valves
• Lever Valves (258 Series) - 11, 31, and 36 Series toggle, lever, and heavy-duty hand lever valves for panel and machine mounting. https://www.rosscontrols.com/en/series/258-lever-valves
• Lockout Valves L-O-X - Energy isolation devices for OSHA-compliant lockout/tagout of pneumatic pendant systems during maintenance. https://www.rosscontrols.com/en/series/1287-lockout-valves-15-series
• Exhaust Silencers - Aluminum silencers for pendant valve exhaust ports to reduce noise at operator stations. https://www.rosscontrols.com/en/series/90-silencers

Frequently Asked Questions (FAQ)

Q: What is the difference between the 2025A Series and the 3900A Series pendant valves?

A: The 2025A Series uses a rigid dial mount with a variable control design and is available in both standard-flow (1/4 inch ports) and high-flow (3/8 and 1/2 inch ports, Cv 2.0) configurations, with some models offering optional protective covers. The 3900A Series uses a rigid dial mount with an integrated hand lever and is available in standard-flow configurations only (1/8 and 1/4 inch ports). Both series use poppet construction and the same temperature and pressure ratings.

Q: What pendant configurations are available for air hoist control?

A: The dual 3/2 configuration (two levers, one handle) controls raise and lower functions for a single-axis air hoist. For an air hoist with air trolley, the quad 3/2 configuration (four levers, one handle) controls hoist raise/lower and trolley forward/reverse from a single pendant housing. Models include 3900A0379 (dual 3/2, 1/8 inch NPT) and 2025A4432 (4-lever high-flow, 1/2 inch NPT with cover).

Q: What is the maximum operating pressure for pendant valves?

A: The maximum operating pressure is 150 psig (10 bar) across all Series configurations. The minimum operating pressure is 0 psig, meaning the poppet design allows control even at near-zero supply pressures, unlike some spool-type valves with minimum pressure requirements.

Q: Can pendant valves be used as pilot signal sources for larger directional control valves?

A: Yes. ROSS pendant valves are widely used as remote air pilot signal sources for larger directional control valves with port sizes from 1/4 inch to 2-1/2 inch. The low-flow standard variants (Cv 0.24 to 0.73) are well-suited to pilot signal service where flow volume is less important than reliable signal generation.

Q: How does the variable stroke control work?

A: The poppet is actuated through a variable-travel lever mechanism. At partial lever depression, the poppet opens a restricted flow passage, proportionally reducing Cv and slowing actuator speed. At full lever depression, the full Cv is available. This feathering characteristic allows operators to modulate suspended load velocity for precise positioning.

Q: Are protective covers required for outdoor or crane-mounted installations?

A: Protective covers are available on select high-flow 2025A models (suffix 2 in model number indicates cover included, suffix 1 indicates no cover). While not required, covers are recommended for outdoor crane installations and production environments where accidental lever contact could cause unintended load movement.

Q: What is the weight of a typical pendant assembly?

A: Standard-flow dual 3/2 configurations weigh approximately 0.9 lb (0.4 kg). High-flow 2-lever 3/2 configurations (2025A3231/3232) weigh 3.0 lb (1.36 kg). Larger multi-lever assemblies are heavier proportionally. All weights are for the valve assembly only, excluding hose whips and mounting hardware.

Q: Can I order pendant valves with G (BSPP) threads instead of NPT?

A: Yes. All models are available with G (BSPP) threads by adding a D prefix to the standard model number. For example, 2025A3232 becomes D2025A3232 for G-threaded ports. No other specification changes; pressure, temperature, and Cv ratings are identical.

Q: What filtration is required for pendant valve applications?

A: ROSS recommends filtered compressed air for all Series valves. A 5-micron coalescing filter upstream of the pendant station is recommended for general industrial applications. The poppet design is inherently dirt-tolerant compared to spool valves, but fine filtration extends seal life and prevents debris from accumulating on the poppet seat.

Q: Are custom pendant configurations available for special applications?

A: Yes. ROSS/FLEX Engineering Design Services provides rapid-response engineering for custom pendant assemblies including non-standard combinations of valve functions, emergency stop integration, corrosion-protection coatings, brass or stainless steel materials, special port configurations, and private label options. Contact ROSS technical support to discuss custom requirements.

Q: What does the D prefix mean in ROSS model numbers?

A: The D prefix indicates G (BSPP) threaded ports as opposed to the default NPT threads. This applies uniformly across the ROSS manual and mechanical valve product lines.

Q: Can pendant valves be used below -40F?

A: For temperatures below -40F (-40C), ROSS recommends consulting their application engineering team directly. Standard Series valves are rated to -40F (-40C). Special low-temperature seal compounds or design modifications may be required for sustained operation below this threshold.

Installation & Maintenance Guidelines

• Mount the pendant valve assembly using the I-bolt hanging mount or rigid dial mount as appropriate for the application. Ensure the mounting hardware is rated for the combined weight of the valve assembly, hose whips, and any accessories plus dynamic loading from operator actuation forces.
• Route air supply hoses with sufficient slack to accommodate the full travel range of the crane bridge, trolley, or pendant arm without creating hose tension that could affect lever actuation feel or pull the valve out of alignment.
• Supply filtered compressed air from an inline FRL unit positioned upstream of the pendant station. Use a 5-micron filter minimum to prevent contaminants from reaching the poppet seats. Ensure the regulator downstream pressure does not exceed 150 psig (10 bar).
• Do not restrict the valve exhaust port. Unrestricted exhaust is required for full flow capacity during actuator return. If exhaust noise is a concern, install a muffler or silencer with a Cv rating at least equal to the exhaust Cv of the valve.
• For air temperatures below 40F (4C), ensure that compressed air is dried to a dewpoint below the minimum operating temperature to prevent ice formation on the poppet seat and in the valve body. Use a refrigerated or desiccant air dryer upstream of the supply FRL unit.
• When installing in cold storage facilities at ambient temperatures approaching -40F (-40C), verify that all fittings, hose whips, and seals are rated for the minimum operating temperature. Standard nitrile rubber hoses may become brittle at low temperatures.
• Connect port 1 (inlet) to the compressed air supply, port 2 to the actuator or pilot device, and port 3 (exhaust) to atmosphere or silencer on 3/2 configurations. For 2/2 configurations, connect port 1 to supply and port 2 to the actuator; these valves have no integral exhaust port.
• After installation, actuate each lever through its full stroke several times to verify free movement without binding or stiffness. Check for air leakage at all port connections and lever mechanism with a leak detection solution.
• Inspect the pendant station mounting hardware and hose connections at regular service intervals, particularly in high-cycle applications such as continuous production hoist operations where mechanical fatigue of fittings and hose ends is a wear mechanism.
• When using pendant valves as remote pilot signal sources for larger downstream directional control valves, ensure that the pilot line between the pendant valve outlet and the main valve pilot port is free of kinks, restrictions, and excessive volume that would increase pilot signal delay time.
• Do not use petroleum-based oils or silicone lubricants directly on the valve body or lever mechanism. Poppet valves are designed to operate dry on filtered air. If lubrication is required for downstream actuators, use a petroleum-based air line lubricator set to approximately one drop per minute with ISO 32 viscosity oil.
• For multi-lever pendant assemblies, verify that each lever operates independently without mechanical interference from adjacent levers. Simultaneous actuation of multiple levers may be required in some hoist and trolley applications; confirm the pneumatic circuit design allows for combined function operation without adverse pressure interactions.

Warranty & Global Support

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

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

Service kits providing replacement seals and internal components are available for field refurbishment of pendant valves. Contact ROSS with the valve model number to identify the correct service kit.

For complete technical data, dimensional drawings, and CAD model downloads, visit the ROSS Controls product page at rosscontrols.com or contact your authorized ROSS distributor.

Download Catalog: https://www.rosscontrols.com/en/documents/319/pendant-control-valves