CM26 Series CrossMirror® Air Pilot Pressure Controlled Double Valves Installation Instructions

Overview

ROSS Controls, founded in 1921 with over 100 years of leadership in fluid power, offers the CM Series CrossMirror® Pressure Return Double Valves as high-integrity, base-mounted pneumatic safety valves providing AND-gate control for machine safety applications. The CM26 air pilot version is controlled by two independent pneumatic pilot signals that must be applied simultaneously to actuate the valve. The CrossMirror® design uses dynamic monitoring and inherent lockout capability that locks out the valve if the two internal valve elements do not operate synchronously.

The CM26 Series meets the requirements of EN13736 (Safety Requirements for Pneumatic Cylinder Presses) and ANSI B11.2 (Safety Requirements for Hydraulic and Pneumatic Mechanical Power Presses) for hazardous pneumatic cylinder applications. The valve achieves Category 4, Performance Level e with functional safety data: B10D = 20,000,000; PFHD = 7.71×10⁻⁹; MTTFD = 301.9 (nop: 662,400). CE Marked; DGUV BG certified.

IMPORTANT: This valve is not designed for controlling clutch/brake mechanisms on mechanical power presses. Contact ROSS at 1-800-GET-ROSS or www.rosscontrols.com.

Key Features

CrossMirror® Dynamic Monitoring and Inherent Lockout

When either main valve element does not operate synchronously with the other — either on actuation or de-actuation — the CM26 automatically moves to the locked-out position. In the locked-out position, one crossover and its timing chamber are exhausted while the other is fully pressurized. The valve elements are held in an intermediate locked-out position by return springs. Sufficient air pressure on the return pistons is required to return to the fully home position, which is achieved by applying a momentary reset signal to the RESET port.

Pneumatic Pressure Actuation with Integrated Silencers

The CM26 air pilot version uses two independent pneumatic input signals. Both air pilot signals must be de-energized prior to reset and must remain de-energized until after the reset signal is removed. The silencers for Ports 3 and 5 are integrated into the valve body — no external silencers are required. Do not restrict exhaust ports 3 and 5, as this adversely affects valve operation.

Compliant with EN13736 and ANSI B11.2 for Pneumatic Cylinder Presses

The CM26 is specifically cited as meeting the safety requirements of EN13736 and ANSI B11.2 for pneumatic cylinder presses and other hazardous pneumatic cylinder applications. This makes it the valve of choice for press manufacturers and end-users who need a single component that meets both the European and North American press safety standards for pneumatic cylinder force-generating equipment.

Technical Specifications

Construction: Double spool and sleeve
Mounting Type: Base mounted
Ambient Temperature: 15° to 122°F (-10° to 50°C)
Media Temperature: 40° to 175°F (4° to 80°C)
Flow Media: Filtered air
Inlet Pressure: 40 to 150 psig (2.7 to 10 bar)
Pilot Pressure: Must be equal to or greater than inlet pressure (not to exceed maximum)
Pilot Type: Pneumatic (air pilot) — pressure return
Reset Port: Supplied externally from a 3/2 normally closed valve; reset signals must be momentary
Integrated Exhaust Silencers: Ports 3 and 5
Pressure Switch Rating: Max Current 4A / 250 V AC; Max Current 50 mA / 24 V DC
Monitoring: Dynamic, cyclic, internal; memory lockout requires momentary reset signal after fault
Functional Safety Data: Category 4 PL e; B10D: 20,000,000; PFHD: 7.71×10⁻⁹; MTTFD: 301.9 (nop: 662,400)
Certifications: CE Marked, DGUV BG
Vibration/Impact Resistance: Tested to BS EN 60068-2-27
Standards Compliance: EN13736, ANSI B11.2

Applications

Pneumatic Cylinder Presses

The CM26 is specifically designed for pneumatic cylinder presses where the force-generating cylinder poses a risk of injury if the control valve fails in a manner that causes unintended cylinder motion. The EN13736 and ANSI B11.2 compliance gives press manufacturers the documented evidence required for machine conformity assessment and regulatory compliance in both European and North American markets.

Pneumatic Two-Hand Control for Hazardous Operations

In applications where two-hand control is required to prevent operator exposure to hazardous machine motion — such as pneumatically actuated clamps, punches, riveters, and assembly fixtures — the CM26 air pilot version provides the AND-gate function using two pneumatically piloted input devices (palm buttons, foot pedals, or guard sensors). The inherent lockout function ensures a single point of failure cannot permit machine actuation.

Safety and Compliance Standards

Complete the mandatory lockout test procedure after installation and after any maintenance before returning to service. Reset anti-tie-down: both air pilots must be de-energized before reset is applied. Before service, shut off electrical power, shut off air supply, exhaust all pressure, and lock out power sources. Use 5-micron rated filter. CAUTION: Before operating the CM Series CrossMirror® double valve, always complete the test procedure upon installation and after maintenance. Failure to do so could result in personal injury or equipment damage.

Installation and Setup Guide

Installation and Test Procedure

Step 1: Blow air lines clean; install 5-micron filter on inlet line.
Step 2: Mount valve and base; connect inlet Port 1, outlet Ports 2 and 4.
Step 3: Do not restrict integrated exhaust silencers on Ports 3 and 5.
Step 4: Connect RESET port externally to a 3/2 NC valve (momentary signals only).
Step 5: Connect optional status indicator pressure switch to monitoring circuit.
Step 6: Apply inlet pressure; perform mandatory lockout test (steps A through F).
Step 7: Test A: Energize both air pilots; de-energize one — expect lockout.
Step 8: Test C: De-energize both pilots; apply reset signal — expect valve unlocks.
Step 9: Test D: Repeat A with the other pilot — expect lockout again.
Step 10: After satisfying all tests, simultaneous actuation of both pilots = normal operation.

Why Choose ROSS Controls

ROSS Controls, founded in 1921 with over 100 years of leadership in fluid power, pioneered the CrossMirror® technology and continues to lead in pneumatic machine safety. The CM26 provides EN13736 and ANSI B11.2 compliance in a single certified component. Contact ROSS at 1-800-GET-ROSS or www.rosscontrols.com.

Download This Document

PDF download: https://ross-admin-global-us-east.s3.amazonaws.com/production/uploads/document_language_file/file/95/ROSS_CM_Series_CrossMirror_Double_Valves_Pressure_Controlled_Installation_Instructions_SS152.pdf

Frequently Asked Questions

Q: What standards does the CM26 meet for pneumatic cylinder presses?

A: EN13736 (Safety Requirements for Pneumatic Cylinder Presses) and ANSI B11.2 (Safety Requirements for Hydraulic and Pneumatic Mechanical Power Presses).

Q: What is the inlet pressure range?

A: 40 to 150 psig (2.7 to 10 bar).

Q: What functional safety data does the CM26 provide?

A: Category 4 PL e; B10D: 20,000,000; PFHD: 7.71×10⁻⁹; MTTFD: 301.9 (nop: 662,400).

Q: How is the valve reset after a lockout?

A: Apply a momentary pressure signal to the external RESET port (from a 3/2 NC valve). Both pilot signals must be de-energized before and during reset.

Q: Are external exhaust silencers required?

A: No — silencers for Ports 3 and 5 are integrated into the valve body. Do not add further restrictions to the exhaust ports.

Q: What temperature range is the CM26 rated for?

A: Ambient: 15° to 122°F (-10° to 50°C). Media: 40° to 175°F (4° to 80°C).

Q: Can the CM26 be used for press clutch/brake applications?

A: No. This valve is not designed for clutch/brake mechanisms on mechanical power presses.

Q: What certifications does the CM26 carry?

A: CE Marked and DGUV BG certified. Vibration/impact resistance tested to BS EN 60068-2-27.