{HEAD ~ The throttle valve} has at least two variable orifices and {TAIL ~ a compensation chamber} between the variable orifices 
has
{ HEAD ~ The throttle valve } has at least two variable orifices and { TAIL ~ a compensation chamber } between the variable orifices
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH