Injector valve?

[c-los13]

I bought some s15 injectors off another.member here. They arrived this morning i noticed the.small metal piece on top of the injector was missing, i texted the seller and he said he had it running like that but i would like to get some second opinions. I took a picture of a godd one and the one thats broken. Any input is appreciated.
this is a good one:
http://i212.photobucket.com/albums/cc68/karetronco/IMG_20120618_085434.jpg
This is the one w.the valve.looking thing broken
http://i212.photobucket.com/albums/cc68/karetronco/IMG_20120618_085422.jpg