Business License
Contact Us
Your inquiry content must be between 10 to 5000 characters
Please enter Your valid email address
Causes and Analysis of Partial Sticking in Butterfly Valves
The reasons for partial overrun are relatively complex. After ruling out factors such as incorrect operation of the control handle, accidental contact with the butterfly valve relay, and failure to engage the locking pin after the butterfly valve opens, the causes of partial overrun were analyzed and determined as follows.
The wear of the butterfly valve pilot and the four-way valve piston causes the gland packing in the piston chamber to seal improperly, allowing pressure oil to leak from the closing chamber. This results in the piston moving toward the closing side under unbalanced pressure, thereby driving the butterfly plate to turn toward the closed position. When the valve reaches a certain position, the remaining pressure oil takes effect, preventing the butterfly plate from further rotating to the fully closed position.
(2) The failure of the butterfly valve rotating bearing to fully engage caused the valve shaft to deviate from the installation centerline, resulting in a closing torque on the disc. Alternatively, bearing wear or slippage reduced the frictional torque of the butterfly valve, leading to disc deflection toward the closing side during operation due to factors such as pressure oil leakage from the relay or four-way valve or vibration.
(3) The occasional imbalance of water flow generates an unbalanced torque on the valve body, causing the butterfly plate to turn toward the closed side.
(4) The maintenance of the butterfly valve failed to meet the quality standards, primarily due to the rotating shaft not being positioned properly or the central axis being misaligned, resulting in the butterfly valve's inability to maintain a stable state as required.
(5) Improper daily maintenance leaves hidden hazards.
(6) The butterfly plate was not opened to the fully open position, leaving travel space, which posed a risk of partial bypass.
Recently Posted
-
Installation precautions for check valves
August 26, 2026Installation precautions for check valves:1. Do not let check valves bear weight in the pipeline system. Large check valves should
Read More -
The purpose of check valve
August 26, 2026Butterfly double valve check valve is suitable for high-rise building water supply pipelines, pipelines with certain chemical corr
Read More -
Process Design of Check Valve
August 26, 2026Process Design of Check Valve：(1) Quality Control of the Main Body Rough Material All components of this valve are forged pi
Read More -
Check valve selection standard 2
August 25, 2026Check valve selection standard：Diaphragm check valve is suitable for pipelines prone to water hammer. Diaphragm can well eliminate
Read More
Contact Us
Recommended Products
-
ANSI Class 150 Lug/Wafer Butterfly Valve ASTM A126B Body API 609 Design ASME B16.42 Flange Industrial Pipeline Valve Manual/Worm/Electric OperatedUS$ 50 - 100MOQ: 9 Pieces -
Certified DIN Swing Check Valve Meeting DIN3356 and ISO5208 Standards for Safe and Efficient OperationNegotiableMOQ: 1 Unit
-
Made in China 150LB, 300LB, 600LB, 900LB BS Non- Rising Gate ValveNegotiableMOQ: 1 Piece
-
ANSI Stainless Steel Gate Valve API600 DN40–DN600 150LB–900LB Industrial Valve Flanged Gate Valve for Oil Gas WaterUS$ 50 - 1000MOQ: 1 Piece
-
4" PN10 PN16 Butterfly Valve Flange BS Butterfly ValveNegotiableMOQ: 1 Piece
-
ANSI Cast Steel Gate Valve API 600/6D Standard 1/2"-40" DN15-DN1000 150LB-900LB WCB/CF8/CF8M Body Flanged End ASME B16.25 TestedUS$ 50 - 700MOQ: 1 Piece
-
API Swing Check Valve BS 1868 Standard 2"-24" DN40-DN600 150LB-600LB ASTM A216 WCB Body Flanged End API 598 Tested Non-Return ValveUS$ 50 - 700MOQ: 1 Piece
-
Made in China DN40~DN1000 DIN Butterfly Valve With PinNegotiableMOQ: 1 Piece
-
900LB API 600 Gate Valve ASME B16.34 2"-12" Flanged/Welded End MSS SP-61 Tested Factory DirectUS$ 100 - 1000MOQ: 1 Piece
-
DN100 Cast Iron DIN Ball Valve PN16 Reliability ValveNegotiableMOQ: 1 Piece
-
API ANSI B16.9/ASTM A234 Wp11 Lr 45/90 Degree DN200 Seamless Steel Pipe Fitting Forged Stainless Steel Seamless ElbowNegotiableMOQ: 1 Piece
-
Universal Joints Single Sphere Carbon Steel Flexible Rubber Epdm Joint Expantion Reduction JointNegotiableMOQ: 1 Piece
-
ANSI B16.5 Inlet Flange Forged Carbon/Stainless Steel Flanges Blind FlangeUS$ 39MOQ: 1 Piece
-
JIS Standard 5K Marine Valves JIS F7376 Cast Iron Cast Steel 10K Angle Check Valves Globe ValveUS$ 580.61 - 683.06MOQ: 1 Unit
-
ANSI Rising Stem Gate Valve Cast Iron Flanged Gate Valve 125LB/150LB MSS SP-70 API 598 DN50-DN1000 Flanged End Petroleum/Chemical IndustryUS$ 35 - 79MOQ: 1 Piece
-
ANSI/JIS DN80 3 Inch Ductile Iron Water Knife Gate Valve Wafer/Flange/Lug Type SS Plate Knife Gate ValveUS$ 551.73 - 689.66MOQ: 1 Piece
-
API 900lb Forged Steel High Quality Stainless Steel SS 316 F304L F22 Flange Type Bolt Bonnet Gate ValveUS$ 207.04 - 690.13MOQ: 1 Unit
-
DIN3352 Square Nut DN200 Ductile Iron GGG40 Double Socket End Gate Valve Used for PVC Pipes Swing Check ValveUS$ 138.03 - 345.07MOQ: 1 Unit
-
GOST GB Standard PN16 DN200 Rising Stem Ss321 GOST Electric Actuator Gate ValveUS$ 551.73 - 1379.32MOQ: 1 Unit
-
ANSI Cast Steel Globe Valve API 600/6D Standard 1/2"-24" (DN15-DN600) 150LB-900LB ASTM A216 WCB Body Flanged End Industrial Flow ControlUS$ 50 - 700MOQ: 1 Piece
