BETTER Drilling Fluid Equipment Industrial Limited could supply Expanding Valve Interchangeable with WKM Model gate valve. The expanding gate valve features a non-ring stem with an expanding gate design to provide safe, dependable service in a variety of environments, It's a available in flanged or threaded ends in standard bore sizes from 2-1/16" thru 4-1/16" in working pressures of 3000psi thru 5000psi.
Full-Bore Design:
Maximizes valve service life.
Eliminates the collections of destructive particles. 
Expanding Gate:
Produces a positive mechanical seal across the seats.
Isolates the body cavity from bore pressure in both the open and closed position.
Metal-to-Metal Seal:
Body/bonnet interface, and gate/seat interface.

Press Fit Seat: 
Press fit seats allow the seats to be tightly wedged into the seat pockets in the open or closed position.
Long Life, Low Maintenance:
Simple routine maintenance program limits repairs, eases operation, protects against corrosion, and extends service life.