Velan Design - Velan Piping King
1. AUTOMATIC STEAM TRAP OPERATION
Inlet
valve and outlet valve both in top, closed position to provide double
protection against leakage through the bypass.
2. COMPLETE SHUTOFF - NO FLOW TRAP ISOLATED FOR SERVICE
Inlet
valve in bottom position, outlet valve in top position. The trap
is now sealed off by the inlet valve and the bypass is closed by
the outlet valve. The valve is protected from back-pressure by the
check valve portion of the outlet valve.
3. BYPASS OPEN - FULL FLOW TRAP ISOLATED FOR SERVICE PREFERRED SERVICE
POSITION
Both
inlet valve and outlet valves in bottom position to seal off the
trap against flow and back-pressure.
Trap is isolated and ready for service.
4. THROTTLED BY-PASSING - TRAP ISOLATED FOR SERVICE
Inlet
valve in bottom position, outlet valve in intermediate position.
The trap is sealed off by the inlet valve and flow through the bypass
is restricted by the position of the outlet valve. The floating check
valve of the outlet valve protects the trap from back pressure.