Introduction

The High Performance Cryogenic Butterfly Valve is a valve that uses the rotation of a butterfly plate to control the flow of media, and is specifically designed for the transportation and control systems of cryogenic media (such as LNG).

Specification

Parameter	Specification
Model	PCB300-CRY or OEM
Size Range	2" ~ 42"
Pressure Range	ANSI 150-300
End Connection	RF / BW
Bore	Full bore
Operation	Manual operation, Actuated operation
Body Material	CF3, CF3M, CF8, CF8C, CF8M, etc.
Disc Material	CF3, CF3M, CF8, CF8C, CF8M, etc.
Seat Material	Soft seat in PCTFE, Metal-to-Metal, Metal+Graphite
Additional Options	Additional sizes and pressure classes available upon request
Basic Design Standard	API 609, EN 593
Face-to-Face Standard	ASME B16.10, EN 558
Flange End Standard	ASME B16.5 (up to 24"), ASME B16.47 series A/B (26" and above), EN 1092
Test & Inspection	API 598, EN 12266
Fire-safe Test	API 607
Fugitive Emission Test	ISO 15848-2
Type Testing for FE	ISO 15848-1, API 641
Application	Developed for LNG systems
Bonnet Design	Extended bonnet for cryogenic application
Corrosion Standard	Manufacturing to NACE latest version on request

Features

Low Loss: An extended bonnet structure moves the stuffing gland position upwards to outside the low-temperature zone, and meets ISO 15848 emission control requirements to control stem seal leakage.

Excellent Sealing: The valve body and disc are made of austenitic stainless steel (such as CF3, CF3M, CF8M). This type of material maintains impact toughness at low temperatures, and combined with PCTFE or metal + graphite sealing structures, it meets sealing requirements in low-temperature environments.

High Temperature Resistance: The sealing structure has passed the API 607 flame resistance test. In the event of soft seal failure, the metal or metal + graphite sub-seal assumes the sealing function, limiting media leakage.

Applications

LNG Industry: Used in liquefied natural gas storage and transportation systems to control the opening, closing, and flow regulation of cryogenic media.

Cryogenic Gas Processing: Applied in air separation and cryogenic gas units to control the flow of cryogenic media such as oxygen and nitrogen.

Oil and Natural Gas: Used in cryogenic separation and processing units to control the flow of cryogenic hydrocarbon media and for system isolation.

Cryogenic Chemical Systems: Used in pipelines involving cryogenic reactions or storage and transportation to achieve media control and equipment isolation.

FAQ

Q: How to choose the sealing type for cryogenic conditions?

A: For extremely low temperatures (such as LNG), PCTFE soft seals are preferred to meet initial sealing requirements. If temperature fluctuations or fire risks exist, metal or metal + graphite composite seals should be selected to balance cryogenic conditions and abnormal operating conditions.

Q: What is the role of an extended bonnet in practical use?

A: An extended bonnet isolates the stuffing box area from the cryogenic medium, keeping the valve stem seal in a higher temperature range, thus avoiding leakage problems caused by packing hardening or shrinkage.

Q: How to select this valve in an automation system?

A: Manual or actuator-driven operation can be selected according to control requirements, combined with flange (RF) or weld neck (BW) connections to match the pipeline. Simultaneously, the suitability of the actuator in cryogenic environments should be confirmed to avoid actuator failure.

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