ZFV Cryogenic ball valve.
Product features :
Type : Trunnion Ball Valve
Connecting : Flanged end , RF
Size and rate : 4’’ class 900
Full bore, 3piece body construct
Operating Torque : 1350/N.m
Face - face distance : 457mm
Finishing polish, no painting needed
Drive : Pneumatic actuator
Suitable Temperature : -29°C ~ 150°C
Suitable Presure: 15Mpa/150Bar
For tight shut off
Standard : API6D, API608
Packing: Plywooden case
Certificate : EN 3.1 certificate
Material : Body stainless steel ASTM A182 F316, Ball A182 F316, Stem A182 F316, Seat NYLON, bolts A320 L7 & A194 7
Standard : Design and manufacture API6D, face to face dimension ANSI B16.10, flange dimension ANSI B16.5, test and inspection API598
Cryogenic treatment of cryogenic ball valves
The cryogenic treatment should be applied to main part of any ultra-low temperature valve of -101 ° C and below, or required by technical agreement. In this process , its main parts include valve body, bonnet, ball, valve seat, valve stem or valve sealing surface.
Before the finishing after roughing, 100% immersion in a cryogenic liquid nitrogen tank at -196 °C for "cryogenic treatment". Immerse the parts in a liquid nitrogen tank for sufficient cooling. When the temperature of the parts reaches -196 °C, keep the temperature at 1-2 hours (or according to the requirements of the corresponding technical agreement), and then take out the box and naturally heat up to room temperature.
The purpose of “cryogenic treatment” is to eliminate the martensitic transformation of the cryogenic valve material and the sufficient shrinkage deformation of the material at the ultra-low temperature, thereby eliminating the hidden dangers affecting the dimensional precision of the low-temperature valve sealing pair and improving the valve at low temperature conditional reliability