13 best type of check valves
Check valves are essential components in various industries, including valves, fittings, hydraulics, pneumatics, plumbing, and industrial science. They play a crucial role in controlling the flow of fluids (liquids or gases) in pipelines and systems, ensuring that the flow only moves in one direction while preventing backflow. There are several types of check valves, each designed to suit specific applications:
Swing Check Valve: Swing check valves have a hinged disc or "flapper" that swings open when the fluid flows in the desired direction, allowing it to pass through. When the flow reverses, the disc swings closed, preventing backflow. These valves are commonly used in water and wastewater systems.
Ball Check Valve: Ball check valves use a ball-shaped closure mechanism that moves up and down to allow or block fluid flow. When there's forward flow, the ball lifts, permitting fluid to pass. In reverse flow, the ball drops and seals the valve. They are often used in applications with low flow rates.
Diaphragm Check Valve: Diaphragm check valves use a flexible diaphragm or membrane to control flow.When the pressure on the upstream side exceeds the downstream pressure, the diaphragm lifts, allowing fluid to pass. In the absence of forward flow, the diaphragm returns to its closed position to prevent backflow. These valves are suitable for corrosive or abrasive fluids.
Dual Plate Check Valve: Dual plate check valves consist of two semicircular plates that swing open on hinges to allow flow in one direction. The plates close to stop backflow. They are compact and ideal for high-pressure applications.
Lift Check Valve: Lift check valves have a disc that lifts off the seat to permit flow when there's forward pressure. When the flow reverses, gravity or spring action forces the disc back onto the seat, sealing the valve. These valves are used in applications with variable flow rates.
Tilting Disc Check Valve: Tilting disc check valves feature a disc that tilts on a hinge, allowing it to open when fluid flows in the desired direction and close to prevent backflow. They are commonly used in the oil and gas industry.
Stop Check Valve: Stop check valves combine the features of a lift check valve and a globe valve. They can be manually operated to stop flow in both directions, making them suitable for applications where flow control is essential.
Duckbill Check Valve: Duckbill check valves consist of a flexible, tapered elastomer tube that opens under pressure to allow flow and closes to prevent backflow. They are useful in applications requiring low backpressure.
These are some of the common types of check valves used in various industries to control fluid flow and prevent backflow. Choosing the right type of check valve depends on factors such as the application, fluid type, flow rate, and pressure requirements. Proper selection and maintenance of check valves are essential to ensure the reliable operation of fluid systems.
Below you can find our editor's choice of the best type of check valves on the market
Beer keg coupler accessories, 4pcs Gas Check valve and 4pcs Beer washer for D type coupler Replacement
Product description
Package content:
4pcs Gas Check valve
4pcs Beer washer
- This check valve and washer install on the inside of the beer coupler on the air/gas hose nipple.
- Made of Food grade silicone.
- Replacements,no need buy new coupler.
- Work well for D Type Coupler
- Full refund for any reason
Control Devices-IC25-AB Brass Check Valve, Poppet Type, 1/4" NPT Female
Control Devices
Product description
- Poppet-type in-line check valve
- Installs in the discharge line of the compressor in cases where an in-tank valve will not fit
- Made from brass for higher corrosion resistance than steel; PTFE poppet and stainless steel spring
- Female NPT threads for use with male threaded pipes
- Maximum pressure rating of 450 psi; maximum working temperature of 400 degrees Fahrenheit
User questions & answers
| Question: | What is the cracking pressure? and full open |
| Answer: | This valve will crack at less than 3 psi and is full open at 12 scfm. |
| Question: | I just purchased this item and it leaks ever so slightly over time so this is not aceptable in my appliation. is it defective |
| Answer: | This valve has a maximum allowable leakage of 50 sccm at 80 psi. Based on your description the valve is probably below this limit. For zero leakage applications we recommend valves with rubber seals, like this one: https://www.amazon.com/Control-Devices-Brass-Check-Valve/dp/B007GDX93E/ref=sr_1_15?keywords=control+devices+check&qid=1568033642&s=gateway&sr=8-15 |
SHYOKO SCH80 PVC Check Valve 1/2'', True Union Ball Check Valve, Ball-Type Control Devices (No Spring), Rated at 150 PSI @73F, Clear [Available 3/4'',1'',1.25'',1.5'',2'']
SHYOKO
- Clear pvc body
- Slip connection for easy attachment
- Maximum pressure rating of 150 psi at 74°F
- 1/2’’ - Meets ASTM and ANSI standards
- Each valve 100% factory tested no leak before delivery
User questions & answers
| Question: | This appears to be made out of a material other than cpvc. is it glued in the same fashion with primer and then pvc cement |
| Answer: | Yes |
| Question: | Will this fit in tubing that is 1/2"id 5/8"od |
| Answer: | Yes, the 1/2’’ check valve has an id of 21.34mm, so it is suitable for pipes with 1/2"id 5/8"od. |
| Question: | can this be installed vertically with the water flow in the down direction |
| Answer: | /Duration 0:05Loaded: 0.00%Stream Type LIVESeek to live, currently playing liveLIVERemaining Time -0:05 Playback Rate1xChaptersChaptersDescriptionsdescriptions off, selectedCaptionscaptions off, selectedAudio TrackFullscreenThis is a modal window. .noScriptDisplayLongText { display : none; } .noScriptNotDisplayExpander { display : none; } .noScriptDisplayLongText { display : block; } Gravity pulls the check valve ball DOWN against the ball-seat. Water MUST flow UP to push the ball upwards from its seat. |
| Question: | what is the length of this vale |
| Answer: | Package dimensions indicate that a 1.5" valve is MUCH longer than 3.5". REAL DIMENSIONAL DATA, please. |
Product features
Prevention of Backflow
The tightly-fitted ball seal abandons the spring or heavy hammer design of the traditional check valve, and has stronger sealing performance. When installed vertically, there is no requirement for the minimum water pressure of the sealing water, and the water resistance is lower. High pressure resistance, can withstand pressure to 150PSI, equivalent to the water pressure of 100 meters of water column
Durable & Non-corrosive
Made of transparent UPVC material without any metal components, these valves will not be blocked or sick due to rust or corrosion. The double-live connection design is convenient for later disassembly, cleaning and quick replacement, shortening the stagnation time of pipeline caused by maintenance
Malida water purifiers Tube Quick Connector Fittings Set of 5 (I-Type check valve)
Malida
Product description
Push To Connect Tube Fitting Elbow RO DI Fitting Reverse Osmosis Package Quantity: 5 pack
- SIZE:1/4" to 1/4" tube OD
- RO DI Fitting Reverse Osmosis
- water purifiers Quick connector
- Male Push To Connect Tube Fitting
- Package Quantity: 5 pack
User questions & answers
| Question: | What is the direction of flow? does the water flow towards the 1/8" npt end? or does the water flow towards the 1/4" tubing end |
| Answer: | Sorry I didn’t remembered backing awhile ago |
| Question: | What PSIs are these rated to |
| Answer: | Project USES the food grade material, suitable for all water purifiers 1/4 "tubing of the valve. I didn't understand what is your question?Can be more specific? |
| Question: | Are the check valves ball valves or crack-pressure valves |
| Answer: | it's just a back flow valve inline is all, one way just look for the arrow on it. |
Zoeller 2" Check Valve with Ball Valve, PVC, Solvent Connection Type - 30-0048
ZOELLER PUMP COMPANY
Product description
2 PVC Ball Valve Check Valve Union Quiet
Escape the Island of Eldritch Lust (Princess to Pleasure Slave Adventure 2)
AIICIOO Swing Check Valve Stainless Steel - 1/2 Inch NPT Female WOG 200 PSI SS304 CF8M Rust Free
AIICIOO
- Swing check valve size: 1/2 inch NPT female x female threaded.
- Swing check valve material: stainless steel 304.
- Check valve working temperature: -60℉ to 450℉(-51℃ to 232℃); max pressure:200 Psi.
- Wide application: Applicable for water, steam, oils, nitric acid, urea and more. Mainly used in the pipelines of petroleum, chemical, pharmacy, fertilizer, electricity.
- Good sealing: The lifting and closing parts are opened or closed by the medium flow and the force, and the sealing property is good to prevent liquid leakage. This type of valve should be installed horizontally during installation, allowing only the medium to flow in one direction to prevent accidents.
User questions & answers
| Question: | Can this valve be installed vertical or horizontal? Does it matter? is the flapper string loaded to return closed? or no spring |
| Answer: | Yes, it can also be installed in vertical-flow up position. No, it is not spring loaded. |
| Question: | what is the minimum pressure to open the valve full? Does pressure upstream, at the destination ie: tank 40-60lbs determine opening pressure |
| Answer: | Yes. The upstream psi determines the flow velocity and the check opens full at very little flow. You can move it side to side and see how easily it moves. It is not like a spring loaded check, it swings freely! |
Product features
Description
1, Using high quality stainless steel material to prevent leakage, pressure, corrosion.
2,The thread is clear, the seal is stronger, the thread is connected consecutively.
3, Transport protection, place the sponge, place the valve plate collision in transit.
4. All-caliber flow, pipe flow is perfectly compatible with check valve.
Good sealing
The lifting and closing parts are opened or closed by the medium flow and the force, and the sealing property is good to prevent liquid leakage.
Hardness
304 stainless steel is twice as hard as copper and ten times as hard as aluminum
No rust
Even in humid environment, it still has strong oxidation resistance and does not corrode
The Unofficial LEGO Technic Builder's Guide, 2nd Edition
No Starch Press
Product features
Clear, step-by-step, full-color directions
Follow along with helpful illustrations to build essential parts for your creations, like reinforced worm gear casings, linkages, couplings, and motorized valves.
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Get acquainted with the Radio Control system, used to make this Pagoni Zonda model.
Spears S158020F 2" FPT Spring Type Check Valve S1580-20F
Rachio WiFi Smart Lawn Sprinkler Controller, 8-Zone 2nd Generation, Alexa and Apple HomeKit Compatible with Rain, Freeze and Wind Skip (8ZULW-B)
Rachio
Product description
Take the guesswork out of watering with a Rachio Smart Sprinkler Controller. The easy-to-use mobile app lets you manage your sprinklers without running back and forth to the controller, while automatic weather adjustments mean no more watering in the rain. Get peace of mind - Rachio knows just how much water your yard needs. Control your sprinklers using a smartphone or with category-leading smart home integrations, including Amazon Alexa and more. Master Valve-Compatible with master valve, pump relay, or indexing valve. Wi-Fi Connection - Wi-Fi (2.4GHz) required. Supports dedicated 2.4GHz and dual-band networks. Cannot operate on 5 GHz only networks. Sensors Rain Sensor - Wired & Wireless Normally Closed (NC) sensors, Soil Sensor - Wired & Wireless Normally Closed (NC) sensors, Wired Flow Sensors
- 5-STAR RATINGS. Amazon’s most- and highest-rated Wi-Fi sprinkler controller.
- Avoid watering in the rain. Exclusive weather intelligence automatically skips unnecessary watering with features like rain skip, wind skip, freeze skip, and more.
- Control from anywhere with the easy-to-use app. Run sprinklers, view upcoming schedules, and observe your estimated outdoor water usage.
- Experience fast DIY installation. Rachio Smart sprinkler controllers replace 99% of existing sprinkler controllers. Install in 30 minutes or less with no special tools needed. Our in-app installation tutorial helps you get online and watering in no time!
- Deliver all the water your plants need; no more, No less. Rachio creates tailored Smart schedules based on the specific needs of your lawn, including plant type, soil type, sun exposure, and more.
- Power source type: Corded Electric. No Hub Required for Voice Control
User questions & answers
| Question: | Can you manually turn on zones from the unit itself without the use of a phone |
| Answer: | If you remove the front cover, there are buttons for selecting a zone and running it manually. There are LEDs in a circle around the Rachio logo, numbered to match the sprinkler zones as you select your target zone. Once the zone you wish to water is highlighted, simply press the manual run button. Good in an emergency, but this unit's primary use case is using the app or website. |
| Question: | Does this work if wifi is down? What watering schedule does it revert to in this case? Will the app alert me |
| Answer: | The Iro utilizes EEPROM, persistent memory, so the last saved schedule(s) are stored on the device itself. So Please rest assured knowing that if the Iro loses connectivity with your WiFi, it will always continue to water using the last saved. Any updates/changes to these watering schedules will upload to the Iro the next time it reconnects with the cloud. You will receive an e-mail notifying you that it is off line. |
| Question: | Can you manually start/stop zones via the app? When working on the system I would love to not walk back to the garage for this |
| Answer: | Yes. You can manually start/stop each zone individually from the app, as well as adjust how many minutes each zone is on. |
| Question: | What's are the differences between gen 1 and gen |
| Answer: | The sync up is totally different in that just approaching the devise with you smart devise it will ask for the serial number and then you are linked with the unit. There are several manual cycles when you do not have wifi available during initial installation. There is the function of the using flow sensors in the future. There is much more space for the valve wires. There is the visual of what valve is operating during the irrigation cycle on the controller to name a few. |
Product features
Remote Control
Start, Stop, Pause or Skip individual zones - even create a Custom Run schedule - all from our exclusive Remote. Only Rachio offers smartphone control this precise.
Intuitive Schedules
Build schedules with confidence. Guided setup walks you through every detail, customizing the timing and frequency of watering to your specific landscape.
Exclusive Weather Intelligence
With advanced Rain, Freeze and Wind Skips, Weather Intelligence automatically adjusts watering schedules for predicted weather based on the latest local forecasts.
Customized Zones
Set up customized zones with confidence. Let Rachio recommend soil type based on your zip code, then add a few simple details like plant type, sun exposure and more to optimize watering for your specific yard.
Most 5-Star Ratings
Amazon’s most- and highest-rated WiFi sprinkler controller is the Rachio Generation 2 Smart Sprinkler Controller.
Committed to Sustainability
We make it easy to nurture a healthy, beautiful yard while embracing sustainable water use.
Easy Installation
Install it yourself - no special tools or expertise required!
EPA WaterSense Certified
Certification date: Dec 2014.
John Guest 1/4" Check Valve, Acetal Resin Copolymer, Push Connection Type
CAI - JOHN GUEST
Product description
Designed for easy, toolless installation this JOHN GUEST check valve is for use with PVC, polyethylene, nylon, polyurethane, brass, copper, and mild steel tubing. Fitting has a durable nitrile O-ring seal, stainless steel teeth, and can be used for potable water, food, chemical, pneumatic, reverse osmosis, plumbing, and fiber optic applications.
Item: Check Valve
Material of Construction: Acetal Resin Copolymer
Size: 1/4"
Connection Type: Push
Max. Water Pressure: 150 psi
Cracking Pressure: 0.3 psi
Max. Temp.: 167 Degrees F
Standards: NSF-61 For Drinking Water, NSF-51 For Food And FDA For Food And Beverage
Control Devices-P5050-1EP Brass In-Tank Check Valve, 1/2" NPT Female x NPT Male
Control Devices
Product description
- Poppet-type in-line check valve
- Installs in the discharge line of the compressor in cases where an in-tank valve will not fit
- Made from brass for higher corrosion resistance than steel; PTFE poppet and stainless steel spring
- Compression connection on one end and female NPT threads on the other for connecting to male threaded pipe
- Maximum pressure rating of 450 psi; maximum working temperature of 400 degrees Fahrenheit
Oxygen Flash-Guard Hose Torch Type Welding Check Valve (Left) Harris 88-3FGL
Harris
Product description
NEW - Surplus Stock - Oxygen Flash-Guard Torch Type Check Valve - Left Hand Threads - 125 Psi Max - 9/16½ – 18 connections - Harris Check Valves 88-3FGL - Harris Model 88-3FGL Flash-Guard Torch Type Check Valve w/Left Hand Threads. Harris Model 88-3FG Flash-Guard torch type check valves fully open with only ounces of pressure. If reverse flow starts, the valve closes immediately for total shutoff. - Product Features - High Capacity- adequate for cutting steel and for operating the largest heating tips - Quality Manufacture- valve spring made of stainless steel for long life - 100% Production Tested- individually tested and packaged immediately to assure cleanliness - Conforms to OSHA regulations -
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