Flanged Ball Valve vs Threaded Ball Valve: Which One Is Better for Your Project? | installation method, sealing performance, application range
Threaded ball valves are suitable for pipelines up to DN50. Installation is straightforward: wrap the threads with PTFE tape and tighten. Their pressure rating is about 68 bar. Flanged ball valves are designed for high-pressure systems above DN50. They require a gasket and diagonal cross-tightening of the bolts. With pressure resistance up to 420 bar, […]
How to Maintain a Flanged Ball Valve in Crude Oil Service | routine inspection, seal protection, operating practice
Flanged ball valves in crude oil pipelines must be kept either fully open or fully closed. Throttling at a 45-degree half-open position is strictly prohibited, as it allows impurities to scour and damage internal components. Routine inspections should be carried out every 3 to 6 months. Cleaning fluid and grease should be injected through the […]
Flanged Ball Valve vs Butterfly Valve in Chemical Pipelines | corrosion resistance, flow control, installation space
In chemical service, flanged ball valves can handle pressures up to 16 MPa, use PFA lining for strong corrosion resistance, and create virtually zero flow resistance. Butterfly valves are only about one-third the face-to-face length of ball valves, making them far more space-efficient. Both operate with a 90-degree turn, but ball valves excel at tight […]
Why Flanged Ball Valves Are Preferred in Chemical Processing Systems | leak prevention, easy maintenance, secure flange connection
By tightening 4 to 8 flange bolts in a cross-pattern sequence and pairing them with a PTFE seal ring, the connection can withstand system pressures of up to 50 bar and keep the pipeline leak-tight. The flange connection is extremely secure, and during routine maintenance, operators can remove the entire valve simply by unbolting it, […]
How to Choose the Right Flanged Ball Valve for Industrial Pipelines | pressure rating, flange standard, valve material
First verify the operating pressure rating (such as PN16) and the flange standard (ASME B16.5) to ensure the bolt spacing matches exactly. Then select the body material based on the medium: WCB carbon steel for standard water and gas service, and 316L stainless steel for corrosive fluids. Before installation, use calipers to measure the outside […]
What Are the Key Testing Requirements for API 6D Ball Valves | Shell Test, Seat Test, Functional Test
During the API 6D ball valve testing, the shell hydrostatic test requires pressurization to 1.5 times the design pressure, holding the pressure for at least 3 minutes with zero leakage; The seat test uses 1.1 times the water pressure or 0.6 MPa air pressure to detect internal leakage; The functional test requires 3 consecutive full […]
How to Extend the Service Life of an API 6D Ball Valve | Proper Material, Regular Inspection, Correct Operation
To extend the lifespan of API 6D ball valves, Inconel 625 weld overlay materials should be selected for highly corrosive conditions. Routine maintenance must strictly execute ultrasonic thickness measurements and grease injection every 6 months. They must be kept in a fully open or fully closed state; it is strictly prohibited to open them slightly […]
Which is Better: Trunnion Mounted vs Floating API 6D Ball Valve? | Torque, Pressure Performance, Valve Size
The overall performance of trunnion ball valves is generally superior. Floating ball valves rely on fluid thrust to press the ball for sealing, making them suitable for low-pressure applications of 6 inches and below Class 300. Under high pressures, their operating torque becomes exceptionally large and they are prone to wear. The ball of a […]
How to Reduce Leakage Risks with the Right API 6D Ball Valve | Seat Design, Seal Material, Pressure Balance
For standard operating conditions, PTFE soft-seated valves are used; for high-temperature and abrasive media, tungsten carbide metal hard seats with a hardness exceeding HRC 65 are selected. Pressure balancing requires a Single Piston Effect (SPE) design, achieving automatic pressure relief when the body cavity pressure exceeds 1.33 times the nominal value. Daily operations require regularly […]
How to Select Materials for Custom API 6D Ball Valves | Carbon Steel, Stainless Steel, Duplex Steel
For conventional oil and gas, select carbon steel WCB, suitable for -29 to 425°C; For corrosive media, select stainless steel 316; For high-pressure sour offshore conditions, use duplex steel 2205 with a PREN value over 35 to resist pitting corrosion. Carbon Steel For operating conditions between -29°C and 425°C, ASTM A216 WCB (cast) or A105 […]
