Condition

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Low temperature butterfly valve
Working condition
Pain Points and Proposal
Reference
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Working condition

Pressure RatingCLASS 150 to CLASS 900 (PN 10 to PN 150)
Nominal SizeNPS 3 to NPS 48 (DN 80 to DN 1200)
Internal Leakage StandardBS 6364, SPE 77/200
Applicable MediumCryogenic Liquids
Temperature Range-196℃
Actuation MethodsPneumatic, Manual, Electric, Hydraulic, etc.

Pain Points and Proposal

1. Internal Leakage

① At low temperatures, the fitting degree of seat ring and disc ring get poor due to inconsistent shrinkage of the valve stem and plate.

② To achieve a good sealing under high-temperature conditions, the closing torque of the actuator is excessively large, resulting in high pressure on sealing surface. The higher the pressure on the sealing surface, the higher the possibility of wear, creep, overload, and metal adhesion. It increases the probability of damage on the sealing surface and the iinternal leakage.

③ Excessive locking force on the seal ring retainer prevents the seal ring from achieving its self adaptive adjustment.

2. External Leakage

An unreasonable extension height of the valve bonnet may easily cause condensed water in the air to enter the packing, where it freezes, scratches the packing, and leads to external leakage.

3. Valve Jamming

At low temperatures, residual moisture inside the valve freezes, causing a sharp increase in valve torque, reaulting jamming of the valve.

1.1 Adaptive seat structure design that maintains a high level of contact between the ball and the seat regardless of temperature variations.
1.2 Anti-displacement energy-storage ring structure to prevent scratches and failures caused by ring movement.
2 The stem extension height is optimized through finite element analysis (FEA) and applicable standards, ensuring the packing temperature always remains above 0°C.
3 Unique elastic seat design featuring low temperature sensitivity, pressure self-adaptation, stable torque performance, and high product consistency.
4 Self-relieving seat structure that can be configured to relieve pressure on the upstream or downstream side according to customer requirements.


Reference