JONLOO Butterfly valves have discs that act as a gate that opens or closes the flow path.Because this kind of valve is lightweight and costs less, industries that need fluid control use them very often. Additionally, many industries prefer this valve as it is small and easy to operate and maintain.

Details
Size: NPS2"~60"(DN50~DN1600)
Pressure Rating: Class150~600(PN10~PN100)
Body material:Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel
End connection:RF, WAFER,LUG, and BW.
Working temperature: -46~+650 celsius degree.
Operation:Wrench, Pneumatic, Electric, Hydraulic
Application: natural gas, propane gas, digester gas, liquid asphalt, HVAC balancing, ore slurries, and various other industrial services.

Standards
Design and Manufacture:API 609,EN 593
Face to Face: API 609,EN 558,ISO 5752
Flanged Ends:ANSI B16.5, ANSI B16.47 A Series & B Series,EN 1092-1,GOST 54432,JIS 2220
Inspection and Test: API598,EN 12266-1

Features
With laminated seat ring:Zero leakage sealing in bi-directional(As per DIN Class I or ANSI Class V)
With massive seat ring:Bi-directional tight seating(As per ANSI Class V)
Be excellent for isolation and control of gases and liquids
Having long service life with welded-in stainless steel or stellited body seat.
No friction,wear and galling in the seat(compression only)
Be easily replaceable and adjustable seal ring
Be applicable to harsh working condition such as high temperature,high pressure and corrosive conditions
Self-compensating for process temperature variances
Low operation torque and reliable seated torque
Inherent fire-safe design.

Eccentric (Double or Triple Offset) Butterfly Valve

The stem passes the center back side of the disk and attached to the center bore. Otherwise known as the single offset butterfly valve, the design prolongs the lifespan of the valve. In order to do so, the disc and the seat have less contact before the valve closes.

• Double Offset Butterfly Valve

  The double offset is a high-performance valve with two offsets radiating from the center. That is, the stem is placed behind the disk and there is another offset placed on one side of the disc.

  The design creates a cam action, transforming the rotational movement into a more linear one. Furthermore, it provides less friction to the seat. An in-depth explanation about what a double offset butterfly valve is can be viewed in the video above.

  Industry standards dictate that this type of valve follows the ANSI Class 600 for stainless and carbon steel. Most seats of this design are made of Teflon but since high-pressure use is also common, metal seats are also available. Most applications include chemical, gas, oil, HVAC, water treatment, and power generation.

• Triple Offset Butterfly Valve

  In contrast to the double offset, the triple offset butterfly valve has three. An additional offset is in the disc seat. Compared to the two other offset designs, this is the most efficient and less prone to wear and tear since.

  In addition to this, the seal is stronger because of the offsets on both sides. Triple offset designs require a metal seat as most applications have to deal with high temperature and pressure that is over 150 psi. If you want to learn more about triple offset butterfly valves, check out the video above.