Question 1

What is a triple offset butterfly valve?

Accepted Answer

A triple offset butterfly valve adds a third offset -an angular cone axis offset to the double offset design. This allows the disc to move without friction against the seat for most of the stroke, contacting only at the final closure point, enabling metal to metal zero leakage sealing

Question 2

What are the main advantages?

Accepted Answer

Key advantages include: friction free operation reducing wear; bidirectional bubble tight sealing; wide temperature range (-196C to 815C); and suitability for high temperature, high pressure, corrosive, and abrasive media applications.

Question 3

Can triple offset butterfly valves achieve bidirectional sealing?

Accepted Answer

Yes. Advanced designs use a spring loaded adjusting ring to compensate for shaft elastic deformation under pressure, enabling reliable bidirectional sealing. Forward pressure increases sealing tightness; reverse pressure is compensated by spring stored energy

Question 4

What leakage class can be achieved?

Accepted Answer

With metal to metal seating, they achieve Class VI bubble tight shut off per 598/ISO 5208.

Question 5

What temperature range can they handle?

Accepted Answer

They operate from cryogenic -196C (LNG service) up to 815C, far exceeding ordinary butterfly valves.

Question 6

Why is operating torque so low?

Accepted Answer

The triple offset geometry ensures the disc does not contact the seat for approximately 85 of rotation -- only making contact at the very end -- resulting in minimal friction and the lowest torque among butterfly valve types.

Question 7

What are key installation precautions?

Accepted Answer

Pipelines must be purged of weld slag before installation; flanges must be perfectly aligned (deviation <1mm) to avoid body distortion; bolts must be tightened evenly using a cross pattern sequence in multiple passes; and the disc should be slightly open during installation.

Question 8

What are common failures and how are they addressed?

Accepted Answer

Common failures: Internal leakage (debris on sealing face -- flush by cycling or clean manually); High operating torque (packing too tight or dry bearings -- loosen packing and lubricate); Stem packing leakage (loose gland bolts -- tighten evenly)

Question 9

What is the recommended maintenance schedule?

Accepted Answer

Inspect manually every 3 months for smooth operation and packing leakage; lubricate stem and gearbox every 6 months; annually or during turnarounds, disassemble critical valves to inspect seal ring wear.

Question 10

How does a triple offset valve differ from standard butterfly valves?

Accepted Answer

Standard (concentric/double offset) valves rely on seat elasticity and experience friction during operation. Triple offset valves use torque-based sealing with nearly friction-free movement, offering higher sealing class (Class VI), wider temperature/pressure capability, and longer service life.

Question 11

How to select the proper body material for a triple offset butterfly valve?

Accepted Answer

Selection depends on media composition, temperature, pressure, and corrosivity. Common materials include carbon steel (for water, steam, oil), stainless steel 304/316 (for mild corrosives), duplex stainless steel (for chloride-containing services), and Inconel (for strong acid/high-temperature environments). We recommend providing full process data for factory-assisted material selection.

Question 12

What is the typical delivery lead time?

Accepted Answer

Standard sizes (DN<600, carbon steel) take about 4~6 weeks; special materials or large diameters (DN>800) require 8~12 weeks. For urgent needs, expedited production can be negotiated, reducing lead time to as short as 2~3 weeks.

Question 13

What factors determine the price of a triple offset butterfly valve?

Accepted Answer

Price is primarily determined by size, pressure rating, body material (carbon steel/stainless/alloy), seating surface material (hard alloy/Stellite/Inconel), actuation type (manual/pneumatic/electric), and any special certifications (e.g., fire-safe, fugitive emission)

Question 14

Do you offer a warranty? What does it cover?

Accepted Answer

The standard warranty is 18 months from shipment or 12 months from installation (whichever comes first). It covers manufacturing defects in the body, disc, stem, and other components, but excludes damage caused by media corrosion, improper installation, misoperation, or normal wear

Question 15

Do you provide on-site installation guidance or after-sales technical support?

Accepted Answer

Yes, we can provide video and phone guidance. If customers have special requirements, we can also provide on-site installation supervision, debugging services, and operation training, and provide long-term spare parts supply. At the same time, there is a 24-hour technical hotline, which promises to respond within 48 hours in emergency situations and arrange engineers to provide docking services.

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