Cryogenic Gate Valve

Description of Cryogenic Gate Valve:The main material of ZECO cryogenic gate
valve is selected. Considering from the metallographic aspect, in addition to
austenitic steel, copper and aluminum with face centered cubic lattice, general
steel will appear low temperature brittleness at low temperature, thus reducing
the strength and service life of the valve. When the temperature is higher than
-100℃, choose ferritic steel; when the temperature is lower than -100℃,
choose austenitic steel; low pressure and small diameter valves can choose
copper and aluminum and other materials. Stem and fastener is selected, when
the temperature is higher than -100℃, stem and bolt materials adopt Ni, Cr-Mo
alloy steel, through appropriate heat treatment, to improve tensile strength
and prevent thread bite. Austenitic stainless steel is used when the
temperature is higher than -100℃. Low hardness of 18-8 acid resistant steel
will cause mutual abrasion between stem and packing, causing leakage of
packing.Therefore, the stem surface must be hard chrome plated (thickness 0.04-
0.06mm), or nitride and nickel-phosphorous plated to improve surface
hardness.In order to prevent nuts and bolts from biting to death, the nuts are
generally made of Mo steel or Ni steel and coated with molybdenum disulfide on
the surface of the threads.

Features of Cryogenic Gate Valve:1. The valve body of ZECO cryogenic gate
valve is able to withstand expansion and contraction due to temperature changes
without permanent deformation of the seat structure due to temperature
changes;2. The bonnet of ZECO cryogenic gate valve is constructed with a long
neck bonnet to protect the stuffing box.The long neck bonnet design also
facilitates winding of cooling material;3. ZECO cryogenic gate valve uses
flexible wedge or open wedge. These structures maintain a reliable seal
regardless of temperature;4. The low temperature properties of the material,
such as compression resilience, tightening force, tightening pressure
distribution and stress relaxation, are taken into account.
Material of Cryogenic Gate Valve:
No Part Material
1 Body ASTM A350 LF3
2 Seat Ring ASTM A276 410 + STL
3 Wedge ASTM A350 LF3 + STL
4 Stem ASTM A182 F6
5 Bonnet Gasket Graphite + SS316
6 Bonnet Bolt ASTM A193 B16
7 Bonnet Nut ASTM A194 4
8 Bonnet ASTM A350 LF3
9 Backseat ASTM A182 410
10 Stem Packing Reinforced Graphite
11 Handwheel KTH330-08
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Minimum Order: 1 pieces

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