- Gate valve
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- DN1000 Extension stem double flange soft seal gate valveDIN F4 resilient seated gate valveDN450-1200 Resilient Seated Gate ValveDIN F5 resilient seated gate valveSocket connection soft seal gate valveUnderground cap soft seal gate valveBS5163 rising stem soft seal gate valveHard seal gate valveAPI slab Gate ValveStainless steel flange gate valveWafer knife gate valvePneumatic gate valveSoft seal gate valveExtension stem gate valveUL/FM fire protection groove ends gate valveRising stem forged steel gate valvecarbon steel gate valveStainless steel threaded gate valveDIN soft seal gate valveANSI soft sealing gate valve 200PSICast iron gate valveBS resilient seated gate valve
- Butterfly valve
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- DN900 pneumatic triple eccentric hard seal butterfly valveD643H Triple Eccentric Butterfly ValveD343H Hard seal butterfly valveMulti standard EPDM seated butterfly valveSingle flange butterfly valveDN2000 Double eccentric butterfly valveFlange butterfly valveLug butterfly valveWafer butterfly valve with handleWorm gear operated butterfly valveWafer lined fluorine butterfly valveStainless steel wafer butterfly valveStainless steel flanged butterfly valveThree eccentric flange butterfly valvePneumatic flanged butterfly valvePneumatic wafer butterfly valveTriple eccentric butterfly valve wafer typeWafer butterfly valve ULC approvedInflatable seat butterfly valveHigh performance butterfly valveGrooved end butterfly valveElectric soft seal butterfly valveFlange fluorine lined butterfly valveHandle aluminum butterfly valveWorm Gear Aluminum Butterfly ValveFull PTFE lined butterfly valve wafer typeOne stem no-pin wafer butterfly valveMulti standard aluminum stem butterfly valveStainless Steel wafer Butterfly ValveAluminium handle operated lug butterfly valveLever Operated Flange Butterfly ValveButterfly valve stemButterfly valve discButterfly valve seat
- Ball valve
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- DN1400 top-mounted eccentric semi-ball valveFlanged three-way ball valveFully welded ball valveNatural gas ball valveHigh platform flange ball valve1 PC ball valveFixed ball valvePTFE seat flanged ball valveMetal seat ball valveAPI 6D ball valve3 Piece ball valveFull Bore 3 way ball valve L-Port3 Way T-Port ball valve2PC Ball valve female thread stainless steel
- Globe Valve
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- API Carbon Steel Globe ValveBellows Globe ValveStainless steel flange globe valveStainless steel thread S type globe valveStainless steel thread B type globe valveCast Steel Globe ValvePiston Globe ValveWCB Carbon Steel Globe Check Valveelectric motorized control stainless steel SS316 globe valveBrass Globe ValveCryogenic Globe valveHT200 Globe ValveThreaded Stainless Steel Globe ValveGG25 Globe ValveANSI API Cast Steel And Stainless Steel Globe valve
- Check valve
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- Rubber seal check valveDN800 Slow closing check valveDN800 Rubber Disc Check ValveButterfly Buffering Check Valvecheck valve with counter weightSilent Check ValveWCB Swing check valveSwing Check ValveSingle Chip Check Valve H74WStainless Steel Wafer Check ValveSwing Start Check ValveFoot check valveAPI Swing Check ValveDIN Flange check valveSingle plate check valveLifting Check ValveBottom ValveHammer Diminish Noises Check ValveWafer Check ValveWafer dual plate check valve
- Water Meter
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- Vertical Type Water MetersStainless steel threaded water meterPiston water meterPlastic water meterMore flow rotor dry water meterspiral vane flange water meterCI wotlman water meter with pulse outputLXCLG(R) Vertical removable element woltman cold (hot) water meterSingle flow rotor dry water meterPrepaid Token Water MeterElectromagnetic flowmeterRotary Piston Liquid Sealed Water MeterRotary Piston Liquid Sealed Water Meter
- Air valve
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- Double ball exhaust valveDoubleair Air Valve SaudiDoubleair Air Valve Southeast AsiaDoubleair Air Valve South AmericaDouble Air ValveThreaded Air ValveSingle Air ValveTriple Functions Air ValveAutomatic Air Release ValveAutomatic release valveAutomatic exhaust valveComposite Exhaust Air ValveBrass exhaust valveDouble Ball Air Valve
- Pipe Repair & Coupling
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- Flexible Multi-Function Pipe Coupling ZFJ-SSS Semi-Circle Pipe Repair Clamp SJW-HDuctile Iron Band Repair ClampStainless Steel Band Repair ClampDouble-Section Pipe Repair CouplingFolding Type Pipe RepairSingle-Section Multi-Function Pipe Coupling MF-SGear-Ring Type Multi-Function Pipe Coupling GR-SZBW Damping Corrugated Hose
- Dismantling Joint
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- VSSJAFC(CC2F) Detachable Flange Transmission JointVSSJA-2(B2F) Double Flange Limited Expansion JointVSSJA-1(BF) Single Flange Limited Expansion JointVSSJA(AF) Flange Loose Expansion JointJGD-B Threaded Rubber JointZBW Damping Corrugated HoseKXT-S Flexible Dual-Spherical Rubber JointKXT Rubber Soft JointFlange Adaptor
What is the Main Function of a Silent Check Valve?
2025-03-18
What is the Main Function of a Silent Check Valve?
I. Introduction to Silent Check Valves
II. Working Principle of Silent Check Valves
The core operation of a silent check valve relies on dynamic balance design and a phased closing mechanism:
Forward Flow Phase:
When media (e.g., water, steam, or oil) flows in the correct direction, fluid pressure pushes the valve disc open, allowing full passage with minimal resistance.
Deceleration Closing Phase:
When flow velocity decreases or the pump stops, the valve disc closes slowly under spring preload or hydraulic damping, preventing sudden pressure surges.
Complete Sealing Phase:
The valve disc tightly adheres to the sealing ring, completely blocking reverse flow.
Key Components:
Valve Body: Made of cast iron, stainless steel, or engineered plastics for corrosion resistance and high pressure tolerance.
Valve Disc: Lightweight design integrated with springs or hydraulic dampers for slow closure.
Sealing Ring: Constructed from high-elasticity materials like EPDM or NBR for long-term sealing performance.
III. Core Advantages of Silent Check Valves
Ultra-Low Noise Operation:
Reduces noise from >90 dB (traditional valves) to 30–50 dB, suitable for noise-sensitive environments like hospitals and hotels.
Prevention of Water Hammer:
Slow-closing technology absorbs pressure fluctuations, protecting pipelines from damage.
Energy Efficiency:
Low-flow resistance design minimizes energy consumption and reduces pump power usage.
Long Service Life & Low Maintenance:
Wear-resistant materials and precision engineering extend lifespan and reduce downtime.
Broad Compatibility:
Compatible with water, sewage, oils, gases, and more. Operating temperature range: -20°C to 150°C.
IV. Applications of Silent Check Valves
Building Water Supply Systems:
Prevents backflow in high-rise buildings and central air conditioning systems.
Industrial Pipelines:
Ensures unidirectional flow in chemical plants and oil pipelines.
Municipal Engineering:
Controls reverse flow in wastewater treatment plants and firefighting water systems.
Specialized Fields:
Used in nuclear plant cooling systems and ship ballast water systems for precise flow control.
V. Installation and Maintenance Guidelines
Installation Tips:
Ensure the valve body arrow aligns with the medium flow direction.
Prefer horizontal installation; vertical installation requires upward flow.
Maintain straight pipe sections (5x pipe diameter) upstream/downstream to avoid turbulence.
Reinforce large-diameter valves with brackets to prevent vibration.
Maintenance Recommendations:
Inspect valve disc flexibility and sealing ring wear every 6 months.
Clean internal debris to prevent blockages.
Lubricate moving parts with food-grade grease (for water systems).
Conduct annual pressure tests at 1.5x working pressure.
VI. Key Functions of Silent Check Valves
Prevent Reverse Flow: Ensures unidirectional flow to avoid equipment damage or contamination.
Noise Reduction: Eliminates water hammer noise for improved environmental comfort.
Extended Equipment Lifespan: Reduces mechanical stress on pumps and pipelines.
Energy Efficiency: Optimizes fluid dynamics to minimize energy waste.
VII. FAQs About Silent Check Valves
Difference between silent and standard check valves?
Silent valves use slow-closing mechanisms to reduce noise and water hammer; standard valves rely on gravity/inertia.
Can silent check valves be installed vertically?
Yes, but ensure upward flow and proper alignment of disc gravity and spring force.
Compatible media?
Suitable for water, sewage, oils, steam, and non-corrosive gases (material-dependent).
Suitable for water, sewage, oils, steam, and non-corrosive gases (material-dependent).
When to replace a silent check valve?
If backflow, abnormal noise, or leakage occurs, consult professionals for inspection.
Do they eliminate water hammer entirely?
They significantly reduce it but may require additional measures (e.g., expansion tanks) for extreme surges.
