Highlight: Bellows Flanged Globe Valve
Product introduction:
Bellows gate valves are primarily gate valves that use bellows as
the stem sealing element. They are often used in scenarios with
strict stem
sealing requirements, such as high-vacuum applications and nuclear
industries. By replacing the packing函 (packing gland) in ordinary
valves
with bellows or using them in combination with packing glands,
these valves can achieve zero leakage at the stem, preventing the
leakage of
radioactive materials or precious metals, or maintaining high
vacuum. The bellows expand and contract with the rise and fall of
the stem, and
their maximum working pressure depends on the pressure resistance
and fatigue strength of the bellows. Bellows gate valves, also
known as
bellows-sealed gate valves, form a metal barrier between the fluid
medium and the atmosphere through automatic roll welding to ensure
zero
stem leakage. The stem adopts a dual-sealing structure of bellows
and packing to ensure leak-free sealing at the stem, making it
particularly
suitable for pipelines conveying flammable, explosive, toxic, and
valuable media. The bellows are made of stainless steel or Inconel
materials,
with a reasonable structural design that is fatigue-resistant and
has a long service life.
Product technical parameter:
Type Number | WZ41H-JGPV |
Nominal Pressure PN(MPa) | 1.0 - 4.0 |
Nominal Diameter DN(mm) | 15～600 |
Test pressure (MPa) | Strength (water) | 1.5 times of pressure nominal |
Sealing (water) | 1.1 times of pressure nominal |
Sealing (Air) | 0.6 times of pressure nominal |
Sealing for bellows (water) | 1.5 times of pressure nominal |
Raw material | WCB, CF8, CF8M |
Medium suitable: | Water, steam, oil mediums |
Working temperature | -196℃～600℃ |
Connection type | Flange |
Operational method | Hand-wheel, bevel gear, pneumatic and electric actuators |
Product features:
1. The key component of the bellows globe valve is the metal
bellows. The lower end is automatically roll-welded to the valve
stem assembly,
and the upper end is automatically roll-welded to the connecting
plate, forming a metal barrier between the fluid medium and the
atmosphere
to ensure zero stem leakage.
2. The valve disc adopts a conical design, with the sealing surface
streamlined to the medium, resulting in better sealing performance
and
longer service life.
3. The dual-sealing design (bellows + packing) ensures that if the
bellows fail, the valve stem packing will also prevent leakage,
complying
with international sealing standards.
4. The valve cover is equipped with a built-in grease fitting,
allowing direct lubrication of the valve stem, nut, and bushing.
Traditional globe
valves can only lubricate the threads.
5. The ergonomic handwheel design offers longer service life, easy
and convenient operation, and greater safety and reliability.
