trailer control valve
The trailer valve, or Emergency Shut-off Valve, is constructed from A356-T6 aluminum alloy or carbon steel. It is designed for a working pressure of 250 PSI approximately 17 bar. The connection diameter is typically 2 or 3 inches with NPT or ACME threaded standards. Its full closure time under nominal pressure is less than 3 seconds. The primary seal uses a resistant elastomer like Viton or EPDM with a -40°C to +120°C operating range. The valve features a manual activation mechanism and a pneumatic actuator requiring minimum 60 PSI air pressure. Its hydrostatic testing complies with DOT-406 standard at 375 PSI.
The internal structure features an axial shut-off disc with a 304 stainless steel stem. The required force for manual activation is under 150 Newtons. The valve body includes a chamber for installing a position switch. This switch transmits the open/closed status signal to the cabin. All wetted parts are resistant to petroleum-based products. The valve has a minimum IP67 rating against water and dust ingress. This design allows rapid isolation of the cargo tank from the vessel in emergencies and complies with DOT and ADR regulations.
