Tmbv Double Block&bleed Ball Valves
Tmbv Double Block&bleed Ball Valves is design with double block and bleed function. With cylindrical forged body, we will apply soft seat( PTFE, RPTFE, DEVLON, NYLON, PEEK) as seat insert to achieve good sealing performance. If the working condition is high pressure and high temperature, we will carry out TCC or STELLITE surface treatment on ball and seat to ensure stability of sealing performance under such strict working environment.
DBB design can ensure the valve's common operation, even one block is temporarily ineffective.
VALVE DESIGN
API 6D, API 6A, ASME B16.34, ISO 14313, ISO 10423, ISO 17292
TEMPERATURE RANGE
-58 to 392°F (-50 to 200°C)
SIZE
NPS 1-12 (DN 25-300)
PRESSURE RATING
ASME 150 - ASME 2500
FACE-TO-FACE
As per API 6D standard
END CONNECTIONS
RF, RTJ as per B16.5 &B16.47
BW, Butt Welded as per B16.25
SW, Socket Welded as per B16.11
MATERIALS
Low Temperature and Low Alloy Carbon Steel
Stainless steel, Duplex and Super Duplex
Nickel alloys, Titanium
BODY DESIGN
Forged and casting bolted two-piece and three-piece
SEAT DESIGN
Soft or metal seated with Hard facing on ball and seats
Double piston seats
Combination seats
FEATURES
Double block and bleed design (DBB)
Secondary seals in pure Graphite
Anti-Static Device
Anti Blow out stem
Emergency sealant injection on seats and stem available
Low fugitive emission stem packing available
O-ring /Lip seals and Graphite configuration
CRA overlay on all dynamic sealing areas or on all wetted parts available
Extended bonnet for low & high temperature available
OPERATOR
Manual: wrench or Gear with padlocking
Actuated: Pneumatic/Electric
TESTING & CERTIFICATIONS
Compliance with API 6D & ISO 5208 & API 598 inspection and testing
Fire safe and fire tested as per API 607
SIL 3 Certification as per IEC61508
Fugitive Emission as per ISO15848
PED 2014/68/UE
FAQ
Q: What are the differences between Side entry DBB ball valve and Top entry DBB ball valve?
A: 1. Installment Side entry ball valve：Ball is installed from the side of the valve body, which is resulting in a more compact structure. Consequently , maintenance for side-entry one requires disassembling the valve body or the pipeline. Our suggestion is that it suitable for scenarios with low maintenance frequency. Top entry ball valve：The ball is installed from the top of the valve body. During maintenance,we need to remove the top valve cover to replace ball or valve seat, without the need to dismantle the pipeline. 2. Cost Side entry ball valve：Because the ball will be installed from side of body, the body is usally integral structure. The price is more economical. Top entry ball valve：The structure for its body is usually split and the cost is higher than side-entry one,but this kind of valve is easy to maintain. 3. Sealing performance Side entry ball valve：The flow resistance is relatively low, the structure is simple, but the sealing surface is easily affected by the medium erosion. Top entry ball valve：The sealing performance is better. Some models adopt a spring pre-tightening design, which can automatically compensate for wear.
Q: What are the differences between One-piece DBB ball valve and Split DBB ball valve?
A: 1. Structure design Integral DBB ball valve: Doulble block and bleed function in single module, forged from premium material, compact structure, no leakage risk. Split DBB ball valve: Split body forged from premium material, Convenient maintainance, 2-piece body or 3-piece body. 2. Sealing performance Integral DBB ball valve: Integral forge body is suitable for high pressure and high temperature working condition. Split DBB ball valve: Split forge body have more connecting points, so the sealing performance will be impacted subtlely. 3.Maintainance cost Integral DBB ball valve: high Split DBB ball valve: low
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