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  • Low temperature stop valve

A globe valve is a valve in which the closing member moves linearly along the centerline of the valve seat. Due to the relatively short opening or closing stroke of the valve stem, the change in the valve seat opening is directly proportional to the stroke of the valve disc, and it has a very reliable cut-off function, which is very suitable for regulating flow. Globe valves are generally connected to pipelines using flange connections or welded connections. The packing part of the low-temperature globe valve is raised, that is, the valve stem is lengthened, which can be reliably and stably applied in working conditions below -40 ℃.

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Structure and characteristics:
1. Globe valves rely on valve stem pressure to tightly fit the sealing surface of the valve disc with the sealing surface of the valve seat, preventing the flow of the medium. It belongs to a mandatory sealed valve. 
2. There are two types of flow directions for the medium in the shut-off valve: "low inlet and high outlet" and "high inlet and low outlet". Only one-way flow of the medium is allowed, and there is directionality during installation.
3. The structural forms of the globe valve body include straight through, straight through, and right angle.
4. When the shut-off valve is opened, when the opening height of the valve disc reaches 25% to 30% of the nominal diameter of the shut-off valve, the flow rate has reached its maximum, indicating that the shut-off valve has reached the fully open position.
5. Globe valves have a simpler structure than gate valves and are easier to manufacture and maintain.
6. The sealing surface is not easily worn or scratched, with good sealing performance. There is no relative sliding between the valve disc and the valve body sealing surface during opening and closing, so the wear and scratches are not severe, the sealing performance is good, and the service life is long.
7. When opening and closing, the valve disc stroke is small, so the height of the globe valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve.
8. The opening and closing torque is large and labor-intensive.
9. The fluid resistance is high due to the tortuous medium channels inside the valve body, resulting in high fluid resistance and high power consumption.
10. The valve disc is often eroded when fully open.
 
Design specifications:
Design standards: API 623, BS 1873, ASME B16.34, GB/T12235, MESC SPE 77/200
Structural length: ASME B16.10, GB/T 12221
Connection standards: ASME B16.5, GB/T 9124, JB/T 79, HG/T 20592, ASME B16.25
Pressure test: API 598, GB/T 13927, GB/T 26480, JB/T 9092, BS 6364
Pressure and temperature rating: ASME B16.34, GB/T12224
 
Performance parameters:
Main material: carbon steel, stainless steel
Nominal diameter: NPS 2 "~NPS 24" DN50~DN600
Pressure range: CL150~CL2500 PN10~PN420
Working temperature: -196 ℃~+200 ℃
Application scope: It can be applied to flammable, explosive, and highly permeable substances, such as liquid nitrogen and LNG.

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