The Stem Guided valve and seat and the Wing Guided valve and full open seat offers many advantages for today's higher pressures and faster drilling operations.

Stem-guided valve &Tri-arm seat

Features: greater fluid flow than four-arm seats, as well as it features an extra wide metal to metal seal on the valve flange,. The serrated upper surface on the valve gives a longer non-breathing seal between valve body and insert while the rigid seat cross-arms give greater strength and positive sealing.
The strong, thick, valve knock off nut holds the insert tightly reducing flex and breathing which lessens the chance of foreign matter getting between valve and insert.