Low temperature valves of globe valve, good sealing and avoid
potential rupture
Size: NPS2～NPS48,
Rating: Class150～Class2500,
Material: Carbon Steel,Stainless Steel,Alloy Steel,Duplex Stainless
Steel
Operation: Manual,Gear Operated,Electric Operated,Pneumatic
Operated
Applicable: Oil,Chemical,Natural Gas,Petrochemical,Coal Chemical
and so on
Design and manufacture standards:BS 6364, ISO 10434, GB/T 24925,
API 600
Face to face dimensions standards:ASME B 16.10, GB/T 12221
Flange dimensions standards:ASME B 16.5, GB, JB, HG, SH, BS, DIN,
JIS and etc
Testing inspection standards:API 598, GB/T 13927, GB/T 26480,
JB/T9092, ISO 5208, BS6364
Kelite valves specialized in manufacturing Cryogenic Gate valve
with following good characteristics: good sealing performance,
reliable safety guarantee, long life span and etc. Cryogenic Gate
valve is one of the most widely used cutting off valve as the
device of cutting off or connecting the flowing medium in pipeline,
but nor for regulation purpose. Gate valve has a wide applicable
range, both for pressure, temperature and nominal size, especially
for middle & large sized pipe. The connection type of cryogenic
gate valve could be flanged, screwed or socket welding.
Flanged Cryogenic Gate valve is used to connect pipe and fitting or
its accessories. Flanged connection has the features of easy
installation, good connection strength and good excellent sealing
performance. The flange connection consists of flanges, bolts, nuts
and gasket. When we fasten the connecting bolts, it would press the
sealing gasket between the flange which would have elastic
deformation and fill all the small space between the two flanges'
sealing face, thus to realize the good sealing.
Cryogenic Gate valve refers to the valve with working temperature
below -110℃ and widely used in area of LNG, LPG and other cryogenic
medium. There are two different types of bonnet designing. One is
bolted bonnet, i.e. the body is connected with bonnet by bolts &
nuts with spiral wound gasket(If required, metal ring gasket could
be provided) between. And the other type is welded bonnet, i.e. the
bonnet is welded to body directly.
Cryogenic Gate valves are suitable for using on various kinds of
pipeline from Class150 To Class900, PN16 To PN160 to cut off or
connect the flowing of medium. By using different material, the
valves could be suitable for medium such as water, steam, oil,
nitric acid, acetic acid, oxidizing substance, carbamide and etc.
Manual/bevel gear/pneumatic or electric actuators could be chosen
by needs.
Most types of Cryogenic Gate valve is forced sealing, i.e. when
valve is closing, an external force should be pushed on the gate to
press it onto the seat surface so as to realize the good sealing.
The rising stem cryogenic gate valve is the gate valve whose stem
moves up and down together with the disc. With the function of stem
nut and guiding groove on valve body, the cryogenic gate valve
turns the rotation movement of disc to linear motion.
Technical parameters and characteristics:
| Product type | Gate Valve |
| Product description | low temperature gate valve |
| Model | Cryogenic gate valve |
| Nominal diameter | NPS 2”～48”(DN50～DN1200) |
| Operating temperature | -196℃～300℃(the range of service temperature may vary for different
materials ) |
| Nominal pressure/td> | CLASS 150～2500 (PN20～PN420) |
| Material | Main material: A351 CF8,CF8M,CF3,CF3M;A352 LCB,LCC, etc. |
| Design standard | API 600,API 6D,ASME B16.34,GB/T 12234,GB/T 12224,BS 6364 |
| Structural length | ASME B16.10,GB/T 12221 |
| Connecting end | ASME B16.5,ASME B16.47,ASME B16.25,GB/T 9113,GB/T 12224 |
| Test standard | API 598,ISO 5208,GB/T 26480,GB/T 13927,BS 6364 |
| Operation method | Non-elevating hand wheel, bevel gear, motor drive unit, pneumatic
drive unit |
| Application fields | For application of liquid nitrogen, liquid hydrogen, liquid oxygen,
etc. in fields such as electric power industry, petroleum refining,
petrochemical engineering, offshore oil, chemical engineering in
urban construction, etc. |
| Other remarks 1 | The sealing faces of valve seat and valve clack are build-up welded
with hard alloy to improve the erosion resistance and extend the
service life of valve. |
| Other remarks 2 | The main parts subject to a temperature ≤-101℃ are subzero treated
to prevent valve deformation under ultra-low temperatures. |
| Other remarks 3 | SS+ graphite or metallic seal or pressure self-sealing is adopted
between valve body and bonnet for reliable sealing. |
| Other remarks 4 | Rising stem structure, making the valve switch position be clear at
a glance |
| Other remarks 5 | The valve stem thread will not come into contact with the medium,
so the corrosion of medium to the thread is reduced. |
| Other remarks 6 | Small switching moment, reliable sealing |
| Other remarks 7 | The gate valve has the wedge resilient, self-sealing parallel
double-plate and stretching type parallel double-plate structures,
so the sealing performance is good. |
| Other remarks 8 | Small flow resistance, high flow capacity and good flow
characteristics |
| Other remarks 9 | For small wedge resilient gate valves, the interchangeability can
be ensured with process tooling. |
| Other remarks 10 | Through improving the structural design and selecting reasonable
packing structure and qualified packing supplier, the valves can
meet the Class A sealing test requirements of ISO 15848 FE. |
