Soft Sealing Double Block&bleed Ball Valve
Soft Sealing Double Block&bleed Ball Valve is through using PTFE,RPTFE, DEVLON,NYLON OR PEEK,etc. as its seat insert to achieve good sealing performance. Once the pressure class is out of 2500 class and the working temperature is out of the normal range, please kindly consider the metal-to-metal seat.
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 seated with Hard facing on ball and 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 Soft seat and Metal-to-Metal seat?
A: Ball valve with soft seat (non-metallic material) has excellent elasticity and zero leakage, suitable for low-temperature, low-pressure and can easily clean media; metal-to-metal seat (metallic material) can withstand high temperatures and high pressures, suitable for harsh working conditions.
Q: The mechanical property of TCC,CCC, STL
A: TCC: The hardness is extremely high. The surface hardness of Ball valve with TCC can be up to 1050HV-1450HV( about 70 HRC).It has excellent wear resistance, but the thicker the coating, the lower the adhesion. CCC: Under extremely high temperature(900℃), Ball valve with CCC can still keep low friction coefficient and excellent wear resistance. STL:The hardness of cobalt-based alloy after spray welding is generally 38 - 52 HRC, while that of nickel-based alloy is 50 - 60 HRC. It possesses both corrosion resistance and wear resistance.
Q: How to achieve Doulbe acting function?
A: For achievng double acting function, we need to change our operation way of ball valve to Actuator acting. Equipped with pneumatic or electric actuator, ball valve can have the ability to emegency open the closure element and shut down it. By the way, if you want to purchase the actuator by yourself, we will offer our price with bare stem and attache the ISO pad information and torque value for you to select suitable actuator by yourself.
Q: How to select materials of seat insert?
A: In common condition, we will quote as your material requirements. If the seat insert our clients select is not suitable for your working condition(medium, temperature, pressure), we help you to change the suitable one for you. The working medium will directly touch with seat insert and working temperature and pressure will impact the sealing performance of seat insert, so our technical team will choose the most fittable material of seat insert for you based on it working condition. Below 150#, PTFE. 150# to 600# RPTFE. 600# to 900# Delvon. 900# to 1500# Devlon or Nylon. 2500# PEEK.
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