35 Series SERPAR® Double Valves with Dual Monitoring Installation Instructions

H2: Overview

The ROSS Controls 35 Series SERPAR® Double Valves with Dual Monitoring are designed to meet both OSHA and CSA Z142 standards for press clutch/brake control on mechanical power presses. By incorporating both an L-G (pneumatic lockout-gate) monitor and an E-P (electro-pneumatic) monitor in a single dual-monitored valve assembly, this product provides the redundant monitoring capability required by the Canadian Standard CSA Z142 for mechanical power press safety.

The dual monitoring configuration provides two independent means of detecting valve malfunction — the L-G and E-P monitors operate independently to lock out the valve when discordance in the shifting of the two main valve elements is detected. Sometimes only one monitor locks out; other times both may lock out. Both monitors must be reset before normal operation can resume, ensuring that all detected faults are formally acknowledged.

The 35 Series SERPAR® with Dual Monitoring is available in Basic Size 8, with L-G and E-P monitors integrated into a single assembly. ROSS Controls has been manufacturing press safety valves for over 100 years since 1921. Installation instructions SS284 cover this CSA Z142 compliant dual-monitored configuration. Additional documentation is available at www.rosscontrols.com.

Key Features

CSA Z142 Compliance with Dual Independent Monitors

The dual monitoring configuration — L-G plus E-P — provides the redundant monitoring capability required by CSA Z142 for mechanical power press safety. The two monitors operate independently: a discordance in valve element shifting triggers lockout in one or both monitors. Both must be independently reset before operation can resume, providing a robust barrier against undetected faults.

L-G and E-P Monitor Coordination

The L-G monitor is reset pneumatically (at least 60 psig / 4 bar minimum at the pneumatic reset port), while the E-P monitor is reset electrically (signal to terminals 1 and 9). The two monitors are independent — it is recommended to provide reset signals to both after any lockout occurrence, per the coordinated reset procedure in the installation instructions, before attempting to resume normal operation.

OSHA and CSA Dual Compliance

The 35 Series SERPAR® with Dual Monitoring satisfies requirements of both OSHA 29 CFR 1910.217 (U.S.) and CSA Z142 (Canada), making it a single press safety valve solution for manufacturers supplying equipment to both U.S. and Canadian markets or for Canadian plants requiring CSA Z142 compliance.

Technical Specifications

Standards Compliance: OSHA 29 CFR 1910.217 and CSA Z142
Basic Size: 8
Monitor Configuration: Dual — L-G (pneumatic reset) + E-P (electrical reset)
L-G Reset Pressure: Minimum 60 psig (4 bar)
E-P Reset: Electrical signal to terminals 1 and 9 (momentary only)
E-P Reset Solenoid: Rated for intermittent duty
Standard Voltages: 100–110 VAC, 50 Hz; 100–120 VAC, 60 Hz; 24 VDC
Pilot Solenoid Power: Each solenoid — 87 VA inrush, 30 VA holding (50/60 Hz); 14 watts DC
Electrical Connections: Internal terminal strip (per circuit diagram supplied with valve)
Ambient Temperature: 40° to 120°F (4° to 50°C)
Media Temperature: 40° to 175°F (4° to 80°C)
Flow Media: Filtered air — 5-micron recommended
Inlet Pressure: 30 to 125 psig (2 to 8.5 bar)
L-G Reset Pressure: 60 psig (4 bar) minimum
Reset Warning: De-energize both solenoids before resetting either monitor
Application: Press clutch/brake control on mechanical power presses

Applications

CSA Z142 Mechanical Power Press Applications

The 35 Series SERPAR® with Dual Monitoring is the specified valve for mechanical power press clutch/brake control applications in Canada that must comply with CSA Z142. It is used on stamping presses, blanking presses, forming presses, and other mechanical power presses in Canadian manufacturing facilities and in export equipment destined for Canadian use.

High-Safety Mechanical Press Operations

In operations where maximum redundancy in press safety valve monitoring is desired — regardless of regulatory requirement — the dual monitoring configuration provides an extra layer of protection against undetected valve faults. Machine builders and safety engineers specifying this product can demonstrate a higher level of due diligence in press safety system design.

Safety and Compliance Standards

OSHA 29 CFR 1910.217 — Mechanical power presses (U.S.)
CSA Z142 — Power press safety standard (Canada)
ANSI B11.1 — Safety requirements for mechanical power presses
Reset Warning: Both solenoids must be de-energized before resetting any monitor
Dual monitor coordination: Provide reset to both L-G and E-P after any lockout

Installation and Setup Guide

Wiring and Electrical Connections

Connect all solenoid and monitor wiring per the circuit diagram supplied with the valve. The terminal strip must be connected correctly — E-P monitor inputs at terminals 1, 3, and 5 (dual input device — never use a single input). The E-P reset solenoid connects to terminals 1 and 9. The L-G lockout signal port can be connected to a normally closed pressure switch for a lockout indicator light.

Air Line and Pilot Supply

Install a 5-micron air filter in the inlet line. Ensure all port connections are of adequate size and free from restrictions. The L-G monitor pneumatic reset port requires a dedicated line with a 3/2 normally closed reset valve (solenoid or manual) capable of supplying at least 60 psig (4 bar).

Post-Installation Testing

After installation, test both monitors for proper lockout function per the test procedure in installation instructions SS284. Verify that: (1) de-energizing one solenoid during operation causes lockout; (2) the locked-out valve cannot be cycled; (3) the monitor(s) can be successfully reset; (4) normal operation resumes after reset. Perform the test for both solenoids.

Coordinated Reset Procedure

After any lockout, provide reset signals to BOTH the L-G monitor (pneumatic, ≥60 psig) and the E-P monitor (electrical to terminals 1 and 9, momentarily). This is the recommended practice to ensure both monitors are cleared before resuming press operation. CAUTION: De-energize both pilot solenoids before resetting either monitor.

Why Choose ROSS Controls

ROSS Controls has been the leading supplier of press safety valves in North America for over 100 years. The 35 Series SERPAR® with Dual Monitoring reflects ROSS's commitment to meeting both U.S. and Canadian press safety standards in a single, proven product. For application engineering support, contact ROSS at 1-800-GET-ROSS or visit www.rosscontrols.com.

Download This Document

The official 35 Series SERPAR® Double Valves with Dual Monitoring Installation Instructions (document SS284) includes complete specifications, wiring diagrams, and monitor reset procedures for the CSA Z142 compliant dual monitoring configuration.

Download PDF: https://ross-admin-global-us-east.s3.amazonaws.com/production/uploads/document_language_file/file/46/ROSS_35_Series_SERPAR_Double_Valves_CSA_Installation_Instructions_SS284.pdf

Frequently Asked Questions

Q: What is the key benefit of dual monitoring on the 35 Series SERPAR®?

A: Dual monitoring provides two independent means of detecting valve malfunction — the L-G and E-P monitors operate independently. This provides the redundancy required by CSA Z142 and also satisfies OSHA 29 CFR 1910.217, making the valve suitable for both U.S. and Canadian press applications in a single assembly.

Q: How is the L-G monitor reset on the dual monitoring version?

A: The L-G monitor is reset pneumatically by applying air pressure (minimum 60 psig / 4 bar) to the pneumatic reset port on the L-G monitor housing. A 3/2 normally closed reset valve (solenoid or manual) should be installed in the reset line.

Q: How is the E-P monitor reset on the dual monitoring version?

A: The E-P monitor is reset electrically by energizing the reset solenoid at terminals 1 and 9. Energize only momentarily — prolonged energization can burn out the solenoid.

Q: Do both monitors always lock out at the same time?

A: No. Sometimes only one of the two monitors will lock out, and other times both will lock out. After any lockout, it is recommended to provide reset signals to both monitors before attempting to resume normal operation.

Q: What is the inlet pressure range for the dual monitoring version?

A: The 35 Series SERPAR® with Dual Monitoring (Basic Size 8) supports inlet pressures of 30 to 125 psig (2 to 8.5 bar), with a 5-micron air filter recommended.

Q: What is the E-P monitor solenoid voltage rating?

A: The E-P Reset Solenoid is rated for intermittent duty at the same standard voltages as the pilot solenoids: 100–110 VAC / 50 Hz, 100–120 VAC / 60 Hz, or 24 VDC.

Q: What does the L-G lockout signal port do?

A: The L-G lockout signal port (on the same side as the reset port) can be connected to a normally closed pressure switch to operate a lockout indicator light, providing visual confirmation of a valve lockout condition to press operators.

Q: How are the pilot solenoids connected on the dual monitoring version?

A: Electrical supply for the pilot solenoids and the E-P reset solenoid is connected via an internal terminal strip, which must be connected according to the circuit diagram supplied with the valve.