would you mean a egr valve i worked on car about 15 years never heard of a ejr but if its a egr that would be a exhaust gas recirculation valve keep the internal combustion chamber cool while the engine running at high speeds
EJR
Valve pocketing is when a valve is hammering the valve seat.mostly due to miss adjusted valve spring/wrong valve spring/to strong of a valve spring or valve stem to short.Makes the valve seat deeper.
tricuspid valve,bicuspid valve and pulmonary valve
A valve spring "keeper" or AKA a valve spring "retainer" is used to lock a valve spring to the valve.
# The PCV valve is located in the valve cover # Detach the hose from the valve then unscrew the valve from the valve cover
Spill valve is a overflow valve.
The tilt of the Earth plus the rotational speed of 1000Mph cases a wobble effect. So the Earth not only orbits on is axis it wobbles on it. See below http://www.soes.soton.ac.uk/staff/ejr/DarkMed/F7wobble.jpg
Ileocecal valve
The valve guide is a precise hole in the head that the valve stem slides in. The valve is retained by the retainer and two valve locks.
intake valve is bigger.
the triscuspid valve is the valve in a bathroom sink.
a gate valve is a one way totally open or closed valve, a control valve is a variable valve.