118 / 1906
ENGINE
82
i) Tank Pressure Valve (TPV) :
The tank pressure valve is a two way valve
provided to keep the pressure in the fuel tank
within safe limits.
The valve operates according to the pressure
inside tank.
1. The tank pressure valve opens out when
pressure differential occurs between the tank
side and open side port and allows Vapour
from the tank to the atmosphere. When the
pressure inside the tank becomes positive
and exceeds on established level of 1 – 2.5
Kpa valve opens out.
2. When the pressure in the fuel tank becomes
negative (vacuum) and reaches it specified
value (1.6 Kpa vacuum) it opens the valve to
let the outside air flow in the fuel tank.