Vatac Stainless Steel Globe Valve are designed and manufactured strictly to International Standards API 602, ASME B16.34, DIN3202 or Equivalent, a compact but extremely sturdy design for high pressure-temperature service, Solid CoCr alloy wedge (optional) ensures low friction and long service life, packing rings are precompressed to 4000 psi to provide a high integrity seal, for welded bonnet valves, the bonnet is threaded in and torqued to an engineered torque value and the body bonnet joint is strength-welded, offering double protection against leakage. (Body/bonnet threads and strength-weld), fully guided wedge reduces wear on seating surfaces, Optional design available with double packing, leak-off connection, live-loading and a packing blowout for easy removal of old packing.  http://www.vatacvalve.net/