Eccentric Structural Design: Commonly available in single, double, or triple eccentric structures, effectively reducing friction and wear during opening and closing, thereby extending sealing life.
Metal Sealing Pair: Options include stainless steel + Stellite alloy, tungsten carbide coating, chromium alloy overlay, etc.—offering superior wear, corrosion, and temperature resistance.
Low Torque, Flexible Operation: Optimized flow channel and sealing angle reduce torque and enhance ease of operation.
High Temperature & Pressure Resistance: Certain designs withstand temperatures up to 600°C and pressures above PN40.
Zero Leakage Performance: Precisely matched and ground sealing surfaces achieve bubble-tight sealing (Class VI).
Extended Service Life: Triple eccentric design nearly eliminates sealing friction, outperforming traditional concentric soft-seated butterfly valves in longevity.
Broad Applicability: Adaptable to harsh conditions such as high temperature/pressure, frequent cycling, and solid particles.
Smart Monitoring (Optional): Compatible with limit switches, position feedback, smart positioners, remote valve position transmission, and cloud-based monitoring—ideal for intelligent plant automation.
High-temperature steam
High-pressure air
Oil-based fluids (diesel, heavy oil, lubricants)
Corrosive gases (customizable based on sealing materials)
Powders and granules (requires specialized structural design)
Acid and alkali chemicals
Process gases (e.g., nitrogen, hydrogen, oxygen)
Petrochemical Industry: High-temp/high-pressure process lines, gas shutoff systems, coking units
Power Plants: Boiler systems, high-temp steam, flue gas desulfurization systems
Metallurgy: Coke oven gas, hot air, oxygen pipelines
Municipal & Environmental: Sludge transport, high-temperature biogas lines
Marine Engineering: High-pressure piping systems, fuel transport
Nuclear & Natural Gas Industry
Structure Type:
Double-eccentric: Suitable for most medium-pressure applications
Triple-eccentric: Recommended for stricter sealing or harsh temperature/pressure environments
Sealing Material Pairing:
General: Stainless steel + stainless steel
Wear-resistant: Stainless steel + Stellite
Strong corrosion resistance: Hastelloy, nickel-based alloys
High temperature: Stainless steel + tungsten carbide coating
Connection Type:
Wafer type: Ideal for small diameters and limited space
Flanged type: Suitable for medium to large diameters, offers secure installation
Welded type: For high-pressure and sealed systems
Actuation Type:
Handle or gear: Applicable for DN ≤ 300
Electric, pneumatic, or hydraulic: Suitable for automated control
Hydraulic spring-return: Ideal for safety-critical quick shutoff systems
These valves are typically used in complex environments such as medium to high pressure, high temperature, corrosive, or particle-laden media. Due to their structural design and metal sealing features, precise installation is critical to ensuring reliable operation and sealing.
Pre-Installation Inspection
Visual Check: Confirm no scratches, dents, or corrosion on disc and sealing surfaces; sealing pair must be intact and smooth.
Model Verification: Check nameplate parameters (size, pressure, material, structure) match application and design drawings.
Actuator Pre-Test: For electric/pneumatic actuators, perform zero/full-stroke testing to prevent seal damage due to incorrect actuation.
Installation Direction & Position
Follow the manufacturer’s flow direction marks strictly—especially for triple-eccentric designs which are often unidirectional.
Mount with the valve stem either horizontal or vertical (stem upward preferred). Avoid “stem-down” configurations to minimize liquid accumulation and wear.
For wafer-type valves: ensure precise flange alignment with flat, concentric faces. Specialized wafer-type flanges are recommended.
Flange & Bolt Connection
Use standard bolts (e.g., Grade 8.8 or 10.9) with anti-seize lubricant. Tighten bolts symmetrically in a crisscross pattern in stages to avoid valve body deformation.
Ensure flange surfaces are flat, free from welding slag and scratches to prevent damage to metal sealing rings.
Sealing Protection Measures
Keep the valve slightly open (5°–10°) during installation to avoid contact between disc/seal and flange.
Do not hammer or pry the valve body—this can misalign the sealing pair or distort the sealing cone.
If minor surface damage occurs on the sealing ring, polish with fine sandpaper (professional assistance recommended).
Open/Close Commissioning
After installation, operate the valve (manually or automatically) through at least 3 full cycles to confirm smooth and obstruction-free movement.
For actuated valves, verify proper setup of limit switches, positioners, and torque settings.
Start-Up & Commissioning
During first fluid injection, pressurize gradually to operational level, observing for leaks or abnormal sounds.
For large diameters or fast gas flows, conduct low-pressure trial runs to avoid impact damage to the sealing pair.
Special Condition Installation Tips
|
Condition Type |
Recommendation |
|
High Temperature (>300°C) |
Preheat the valve body to prevent thermal shock to the sealing pair |
|
Corrosive Media |
Use special alloy sealing materials; apply anti-corrosion treatment pre-installation |
|
Particulate Media |
Install filters or purge systems to prevent particle-induced seal damage |
|
Frequent Cycling |
Equip with high-durability actuators and dampers to reduce impact on sealing elements |
Installation Record Keeping
For each installation, document:
① Installation location
② Installer name
③ Operation test results
④ Pressure test outcomes
⑤ Sealing pair material codes
⑥ Limit switch setting parameters
These records support future maintenance and troubleshooting.
To ensure long service life, zero leakage, and safe operation, regular and systematic maintenance is essential.
Recommended Inspection Schedule
|
Inspection Item |
Frequency |
Details |
|
Sealing Pair Wear |
Every 3–6 months |
Check disc and seat cone surfaces for matching and damage |
|
Actuator Lubrication |
Every 3–12 months |
Check manual/gear/electric actuator internals for lubrication or rust |
|
Packing Leakage Check |
Monthly |
Inspect packing gland for seepage; replace graphite packing if needed |
|
Feedback Signal Verification |
Quarterly |
Ensure proper function of limit switches and positioners |
|
Bolt Tightness |
Quarterly |
Check all connection bolts for looseness and retighten if necessary |
Cleaning & Lubrication
Cavity Cleaning: After system shutdown, use compressed air or suitable solvent to remove media deposits from the disc and sealing surfaces, especially in solid-containing applications.
Lubrication:
Apply high-temp antioxidant grease to gear operators regularly.
For electric/pneumatic actuators, follow the manufacturer’s instructions for periodic oiling and maintenance.
Actuator Maintenance (Electric/Pneumatic)
Calibrate limit switch positions to prevent over-travel damage to sealing rings.
For electric actuators: check terminal wiring, overheating protection, and control signal stability.
For pneumatic actuators: clean air supply, and drain filters, pressure regulators, and water traps regularly.
Troubleshooting Guide
|
Issue |
Possible Cause |
Recommended Action |
|
Sealing Leakage |
Scratched seal, debris entrapment, misaligned eccentricity |
Polish or replace seal; re-calibrate eccentric angle |
|
Difficult Opening/Closing |
Debris in pipeline, rusted bearings, actuator failure |
Clean valve cavity, inspect bearings, retest actuator |
|
Packing Leakage |
Aging packing, loose gland |
Replace graphite packing and tighten appropriately |
|
Inaccurate Feedback Signal |
Limit switch shifted, faulty positioner |
Reset switch, repair positioner |
|
Valve/Disc Corrosion |
Residual fluid or delayed cleaning |
Thoroughly drain and clean post-operation; apply protective coating |
Handling Long-Term Shutdowns
Store the valve in a half-open position to avoid long-term stress deformation of sealing components.
Disconnect power/air from actuators and apply protective covers.
Rotate the shaft manually 1–2 times per quarter to prevent bearing seizure.
Store in a dry, well-ventilated area protected from dust and corrosive gases.
