FREEDE Co. Quality Guarantee Issues
1.    Shell thickness reach and exceed demand of GB and ANSI standards.
2.    Chemical element and mechanics performance of body material reached demand of stipulated standard.
3.    Chemical element of stem material reached demand of stipulated standard; whole precision grind, causticity resistant surface and nitrification assured mechanics performance and rigidity of stem.
4.    Tolerance met with demand of stipulated standard.
5.    Seat seal structure adopt: dissociative thread seat and dissociative enchased weld seat.
6.    Rigidity of seal face reached demand of stipulated standard, and the width exceed stipulated standard.
7.    Middle part flange seal adopt trapeziform slot metal loop mat and high intensity bolt, so the seal will be more reliable and more effective.
8.    It has been high pressure spurt cleanout with coal oil and antirust oil before assembling, clean out test medium after tested, and sprayed antirust oil.