Terminator Gravity Mount General Description

The Terminator valve actuator with Gemini controller is an economical emergency chlorine shutoff system designed for use on 150 lb (68 kg) type chlorine and sulfur dioxide cylinders commonly used at water and wastewater treatment plants. The system is DC electric powered with AC only used for keeping battery optimally charged at all times. In the event of a loss of AC power, the system continues to protect for 24 hours. If AC power remains off for an extended period of time, the system will auto-initiate emergency close while sufficient battery power remains.

The Terminator is compatible with standard valves meeting Chlorine Institute specifications and requires no tools or adapters for installation. The Terminator is simply placed on the cylinder valve after process connections are made, leak tested, and the valve opened. Being a safety device, the Terminator is only powered in the closing direction. When the Gemini controller receives an emergency close signal from a gas detector, emergency shutoff switch, or other input, the Terminator is activated and the cylinder valve is rapidly closed. One or two Terminator actuators may be controlled by the Gemini, making this the perfect safety solution for both single and dual cylinder applications. System includes a low voltage 24VDC relay output for remote indication of emergency close activation and an optional relay in-terface module provides dry contact relays with latching capabilities when required.


  • Economical, low cost solution.
  • Protects personnel and community by quickly and automatically stopping a gas leak.
  • Easy-to-use gravity mount design for 150 lb (68kg) cylinders.
  • Battery powered system – continues to protect for up to 5 days if AC power lost.
  • Fire code approved for many applications as scrubber alternative.
  • Helps comply with RMP gas leak mitigation requirement.
  • Compatible with all cylinder mounted vacuum regulators.
  • Actuator retention pin for added security.

Terminator Gravity Mount Technical Specs

Enclosure :XENOY™, NEMA 4X
Drive Shaft :440C Stainless Steel
Drive Bushing :XYLAN® Aluminum-Silicon Bronze
Cable :7 ft (2.14m), 2 Wire
Closing Torque :40 ft-lbs
Charging Current @ 110/220VAC :0.9A MAX
Charging Current @ 12VDC (Solar) :.34A MAX
Battery Type :12VDC, 8.0 Amp-Hour, High Rate
Standby/Backup Time :Up to 5 days
Standard Compatibility :Chlorine Institute DWG’s 110, 113
Yoke Compatibility :Chlorine Institute DWG’s 189, 131


Terminator Options And Accessories

4500.05 :Relay Interface Module – 5A, 250VAC Dry Contact
4500.06AManual Relay Reset Button (requires Relay Interface Module, P/N 4500.05)
5151.00 :Open Style Yoke
6888.00 :Yoke to Pigtail Adapter
2202.00 :Auxiliary Valve Adapter
6430.00 :Additional Emergency Close Switch
8600.00 :Additional Actuator Storage Bracket


Eclipse Actuator

The Eclipse™ emergency valve actuator automatically closes chlorine or sulfur dioxide ton container and 150 lb cylinder valves in the event of a system leak or emergency.

Junction Box

Junction Box for extending actuator cable lengths. NEMA 4X/UL listed, color coded screw terminal connectors for joining actuator cables to conduit wires.

Chlorine Ton Container Adapter

Chlorine Ton Container Adapter. Allows Eclipse and Terminator valve actuators to be used with vacuum regulators that require adapters.

VR Extension

VR Extension for Direct Mount Vacuum Regulators. Allows both the Eclipse actuator and the vacuum regulator to be mount-ed to the same ton container valve.