Description
The EVRM-NA type valve is a manual reset safety valve that is normally open. The closing function is electrically activated. This type of device, connected to one or more gas leakage detectors, safety thermostat or alarm signals for the presence of carbon monoxide, is suitable to perform locking operations on the gas line
Function and Application
The EVRM-NA /6NA type valve is a manual reset safety valve that is normally open. Manual operation is, therefore, necessary to open the valve and reset the mechanism consenting to maintain this state. The powered by means of line current and/or condenser discharge, induced by the leakage detector, safety thermostat, or alarm system cause driving of the mechanism and consequent closing of the gas orifice. If the energizing of the sensor persists because of the presence of gas, the valve remains under power and does not allow reset. When the causes of locking have been eliminated, the valve must be opened manually.
The models from DN125 or bigger and the 6 bar versions are provided with a dual-shutter system for pressure compensation. To open the valve pull the knob for the first step, wait for pressure compensation, and then pull the knob completely up to full resetting.
Specification
| Connections | Internal threaded ISO 7-1 from Rp3/8 to Rp2½ |
| ANSI-ASME B1.20 from 3/8” NPT to 2”½NPT | |
| Flanged ISO 7005 PN16 from DN40 to DN300 | |
| ANSI-ASA-ASME B16.5 class 150 from 2” to 10” | |
| Voltage ratings | 230 VAC 50/60 Hz |
| 110 VAC 50/60 Hz | |
| 24 VAC/DC | |
| 12 VAC/DC | |
| Voltage tolerance | -15% to +10% |
| Temperature | -15°C to +60°C (+5°F to +140°F) |
| Max. operating pressure | 600 mbar (9 psig) |
| 6 bar (90 psig) | |
| Body test pressure | 1 bar (15 psig) |
| 9 bar * (130 psig) | |
| Closing time | < 1 second |
| Gas strainer | 600 µm (0.02 in), metal mesh (except 6 bar models) |
| Enclosure | IP54 (NEMA 3) |
| (IP65 optional with cable NEMA 4) | |
| Cable gland | PG 9 |
| Wires cross-section | 1,5 mm2 max. (AWG 14) |
| Electrical safety | Class I (EN 60335-1) |
| Coil winding insulation | Class H (200°C, 392°F) |
| Coil thermal resistance | Class F (155°C, 311°F) |
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