Double Block&bleed Ball Valve
Platinum DBB ball valve is designed with two closure elements that can achieve double block and bleed function. It can isolate medium from upper steam and downsteam. At same time, to relieve residual pressure through the middle cavity. The safe control of DBB double ball valve can be met. Platinum valve's DBB ball valve is including DBB Trunnion ball valve, DBB floating ball valve, etc. If you have special design requirements, our team will customize it in compliance with your standard.
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): Ensures double sealing and pressure relief, providing enhanced safety and reliability.
Secondary Seals in Pure Graphite: Offers excellent sealing performance and resistance to high temperatures and pressures.
Anti-Static Device: Prevents static electricity accumulation, ensuring safe operation in hazardous environments.
Anti-Blowout Stem: Adds an extra layer of protection against stem ejection in high-pressure situations.
Emergency Sealant Injection on Seats and Stem: Provides a quick and effective means of sealing leaks in emergency situations.
Low Fugitive Emission Stem Packing: Reduces emissions and environmental impact, meeting stringent regulatory requirements.
O-Ring / Lip Seals and Graphite Configuration: Combines the flexibility of O-rings and the durability of graphite for superior sealing.
CRA Overlay on All Dynamic Sealing Areas or on All Wetted Parts: Enhances corrosion resistance and extends valve lifespan in harsh environments.
Extended Bonnet for Low & High Temperatures: Accommodates a wider range of operating temperatures, ensuring valve performance in extreme conditions.
OPERATOR
Manual: wrench or Gear with padlocking
Actuated: Pneumatic/ Hydraulic/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: 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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