extended stem ball valve Description
Extended stem ball valves are valve devices designed to operate in special conditions by extending the stem, and their core functions include:
Remote control: control the opening and closing of valves in deeply buried or high-risk environments from the ground or a secure area by extending the stem (up to several metres);
Media control: suitable for the cut-off and regulation of liquids, gases and cryogenic media (e.g. LNG), with some models supporting fluids containing fibres or particles;
Environmental adaptability: can be directly buried in the ground or deployed in low temperature (-196 ℃), high pressure (Class 2500) and other extreme environments.
Structure
| subassemblies | Technical features |
|---|---|
| Extended stem | Stainless steel or nickel-based alloy with chrome-plated surface, lengths can be customised according to working conditions (standard 1.5-3 metres) |
| valve body | Fully welded carbon steel/stainless steel construction, no need for large valve wells for buried installation, saving construction costs. |
| sealing system | Fireproof design: When the PTFE seal fails, the spring pushes the metal seat to form a secondary seal with the ball. |
| Actuating type | Supports remote operation with manual wrenches, hydraulic actuators or ROVs (underwater robots) |
extended stem ball valve specification
|
item |
value |
|
Application |
Commercial Kitchen |
|
Port Size |
25 |
|
place of origin |
China |
|
Henan |
|
|
power |
Hydraulic |
|
temperature of media |
High Temperature, Low Temperature, Medium Temperature, Normal Temperature |
|
brand name |
GNEE |
|
structure |
ball |
|
media |
Water |
|
customized support |
OEM, ODM |
|
Ball Material |
Carbon Steel |
|
Connection Type |
FLANGED |
|
Operating Pressure |
200PSI, 775psi |
|
Connection Size |
2 in |
|
Sealing Material |
EPDM |
|
Operating Temp. Range |
32-150f |
extended stem ball valve
Advantages
Installation Convenience
Fully welded valve body can be directly buried, only shallow service wells are required, reducing the amount of civil engineering work by 90%;
Seal reliability
Double-stage sealing (soft seal + metal seal) design, leakage rate ≤ 1/3 of BS 6364 standard;
Resistant to extreme environments
Low-temperature models have passed SHELL 77/200 certification and can withstand -196℃ liquid nitrogen medium.
Applications
City heating network: DN50-DN1200 fully welded ball valves are used for heat pipeline media control, opening and closing torque ≤ 200N-m;
LNG storage and transportation system: extension stem cryogenic ball valve meets BS 6364 standard, used for liquefied natural gas pipeline cut-off;
Oil and gas field direct buried pipeline: carbon steel valve body + epoxy coating anti-corrosion, adapted to the soil environment with Cl- concentration >5000ppm.
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