Top mounted low-temperature ball valves are valve fittings used for low or ultra-low temperatures. Mainly used to connect or disconnect media. Its characteristics are low fluid resistance, quick and convenient switching, and good sealing performance. The valve stem seal is reliable and can achieve automatic and remote control. Overcoming the difficulties of disassembling and repairing other ordinary low-temperature ball valves on pipelines, as well as the sealing leakage caused by the middle flange due to thermal expansion and contraction.

This product has the following structural characteristics:

1. Integrated valve body design, with upper mounted pivot fixed support.

2. The high-strength integral pivot fixed ball design adopts an anti blowing protection structure to ensure the precise positioning of the ball.

3. It has dual blocking and releasing function (DBB function).

4. Due to the nickel coil spring, the metal valve seat moves towards the ball, providing bidirectional sealing function for both the inlet and outlet.

5. The high-performance metal hard sealed valve seat ensures effective sealing at low temperatures.

6. Adopting unique retractable valve seat technology, the valve stem, valve stem sealing ring, metal valve seat, and spiral spring can be replaced online.

7. Sealed grease injector design, when the valve seat is sealed with PCTFE, sealant can be injected in emergency situations to seal the valve seat

8 is used for low-temperature valves at -100 ℃, using austenitic stainless steel. The valve body, valve cover, valve seat, valve stem and other parts undergo at least 2 deep cold treatments before precision machining.

9. The valve cover shall be lengthened according to Shell's "Valve Specification Requirements for Low Temperature Media", and the partition/drip plate shall be welded to ensure that the packing is always at a temperature above zero under different low temperature conditions, and to ensure that the valve stem will not be damaged when moving at the packing.

The small diameter space between the 10 valve stem and the extended valve cover reduces heat transfer losses.

The surface of the 11 valve stems has undergone surface hardening treatment, and the roughness RU value of the contact surface with the packing is less than 0.4um.

Performance parameters:

Nominal Size:

DN15~DN600/NPS1／2~NPS24

Nominal Pressure:

PN16~PN100/Class150~Class600

Valve body Material:

Carbon steel/3.5% nickel steel/alloy steel/austenitic stainless steel

Operating temperature

-29℃~-196℃

Suitable medium:

LNG、 Liquid nitrogen, liquid oxygen, liquid ammonia, etc

Operation method:

Manual, gear, pneumatic, electric

Design and Manufacturing:

GB／T12237/ GB／T 24925/API 608/MESC SPE 77／200

Flange size:

JB／T 79/ GB／T 9113/HG／T 20592/ASME B16.5

Structural length:

GB／T 12221/ASME B16.10

Inspection and Testing:

GB／T 26480/API 598/ GB／T 24925/BS6364