If you own a submersible well pump, you know the frustration of hearing water hammer banging through your pipes every time the pump stops. That shock can shorten the life of your pump, pressure tank, and even your plumbing. A quality check valve for water well pump solves this by allowing water to flow in one direction only, preventing backflow before it starts.
In this guide, we compare six check valves designed specifically for well pump applications. From compact brass units to heavy-duty stainless steel models, we break down their key features and help you choose the one that fits your system. If you’re also upgrading your pressure tank setup, check our well pump for pressure tank for a complete picture.
Pros
- Easy, direct installation with included Teflon tape and clear flow arrow.
- Durable forged brass construction outperforms cast check valves in corrosion resistance.
- Effectively eliminates water hammer and pipe vibration, protecting your pump system.
- High customer satisfaction with a 4.9 out of 5 star rating across 30 reviews.
Cons
- Only available in 1-1/4 inch size, may not fit all pump systems.
- Not recommended for high-temperature steam or strong oxidizing chemicals.
- No union or disassembly feature, which could make maintenance slightly more involved.
The VERIWIS 1-1/4" Brass Check Valve is a direct-fit, spring-loaded check valve designed specifically for submersible well pumps. It is also ideal for irrigation systems, sump pumps, and other water transfer applications where backflow prevention is critical.
Its standout feature is the instant spring-loaded action that stops backflow and dramatically reduces water hammer. The low cracking pressure allows smooth forward flow, while the 304 stainless steel spring snaps the rubber washer shut the moment flow reverses, preventing chatter and vibration.
The valve features a precision-forged brass body that resists corrosion and mineral scaling far better than cast alternatives. Inside, a high-resilience stainless steel spring and abrasion-resistant NBR rubber seat ensure consistent sealing and long service life under heavy-duty cyclic use.
One potential drawback is that this valve is only available in the 1-1/4 inch size, which may not fit all pump configurations. Additionally, it is not intended for high-temperature steam or strong oxidizing chemicals, limiting its use in some industrial settings.
Overall, the VERIWIS check valve offers exceptional build quality, easy installation, and reliable performance at a reasonable price. With a near-perfect customer rating, it is a smart upgrade for anyone needing a durable, quiet backflow preventer for their well pump or irrigation system.
Brand: VERIWIS
Model: VWCV01
Size: 1-1/4 inch NPT
Material: Solid Forged Brass
Spring: 304 Stainless Steel
Seat: NBR (Buna-N) Rubber
Connections: 1.25" MNPT Inlet x 1.25" FNPT Outlet
Dimensions: 2.2 x 2.2 x 3 inches
Weight: 14.88 ounces
Warranty: 3-Year by VERIWIS
Included: Check valve, manual, Teflon tape
Pros
- Precision-machined brass body for reliable sealing and corrosion resistance
- Stainless steel spring and fasteners for long-term durability in water applications
- Compatible with standard 1-1/4 inch NPT well pump and irrigation connections
- Flexible installation orientation and clear flow arrow
- Strong customer satisfaction and dependable pressure retention
Cons
- Only available in 1-1/4 inch NPT, so other pipe sizes require adapters
- NPT threads need sealant tape or pipe dope to create a leak-free connection
- All-metal body is heavier than plastic check valves and may need support in some installations
The Wassermann 1-1/4 inch brass check valve is a spring-loaded backflow preventer built for submersible well pumps, irrigation lines, and household water supply systems. It connects with a 1.25 inch NPT inlet and a 1.25 inch FNPT outlet, making it a direct replacement for standard 1-1/4 inch well pump installations. Homeowners and contractors who want a corrosion-resistant valve will appreciate the durable all-brass body.
The valve opens automatically as water flows in the correct direction and closes quickly when flow reverses. A stainless steel spring and fasteners on the poppet help reduce water hammer, protecting the pump and downstream pipes from pressure spikes. User experiences show tight sealing and steady pressure retention, with no measurable water loss over a full week of use.
Machining accuracy and seal quality are noticeably better than typical hardware-store check valves. The brass exterior resists rust and corrosion in deep well environments, while the strong body stands up to repeated cycling. An arrow on the valve clearly marks flow direction, and the design supports both horizontal and vertical installation.
The main limitation is the fixed 1-1/4 inch NPT size, so other pipe diameters need adapters. Installers should use thread sealant tape or pipe dope on NPT threads to avoid leaks, and the all-metal construction is heavier than plastic valves, which may require extra support in certain layouts.
Overall, this is a dependable upgrade for well pump and water system owners who need reliable backflow prevention. Solid materials, precise machining, and strong sealing performance make it a smart choice for 1.25 inch NPT systems. For long-term durability and peace of mind, the Wassermann brass check valve delivers.
Pros
- Easy to install with standard tools and minimal plumbing skills.
- Effectively stops backflow, solving common well pump short-cycling issues.
- High-quality brass construction with no lead for safe water.
- Excellent value compared to professional pump replacement costs.
- Positive user feedback highlights reliable performance and no leaks.
Cons
- Some users report threads may arrive marred, requiring extra tape or paste to seal properly.
- Not suitable for vertical installation; must be installed horizontally for proper operation.
- No integrated spring, so it relies on gravity and backflow pressure to close, which may not be ideal for all systems.
The American Granby CVNL100BS is a 1-inch brass check valve designed for water well systems. It is specifically used to prevent water from flowing backward from the pressure tank into the well, a common issue that causes pumps to cycle frequently and wear out prematurely. This valve is ideal for homeowners and DIYers looking to solve such problems without costly pump replacement.
In real-world use, this check valve has proven effective. Customer reviews highlight how it solved water pressure issues and stopped pumps from running excessively. One reviewer noted that after installing it before their pressure tank, the pump only ran when water was needed, potentially extending the pump's lifespan. The installation is straightforward for those with basic plumbing skills, especially when using 1-inch plastic or copper lines.
The valve's construction is solid, featuring no lead brass that meets NSF/ANSI 372 standards for safe drinking water. It is rated for a maximum pressure of 200 psi, making it suitable for most residential well systems. The NPT threads allow for a secure connection, though some users have reported that the threads can arrive slightly marred, which may require extra sealing tape or pipe dope to ensure a leak-free fit.
While the product is generally reliable, there are a few considerations. The threads issue, while not universal, is worth checking upon delivery. Additionally, this check valve is gravity-operated, meaning it should be installed horizontally to function correctly. Vertical installations may not allow the valve to close properly, so careful placement is necessary.
Overall, the American Granby CVNL100BS is a high-quality, cost-effective solution for well pump backflow prevention. It has earned a 4.7-star rating from over 170 customers, reflecting its performance and value. For anyone experiencing pump short-cycling or backflow issues, this valve is a smart investment that can save hundreds of dollars in service calls.
Pros
- High-quality machining and durable build praised by users
- Good value for a no-lead brass check valve
- Easy to install with standard threaded fittings
- Versatile orientation for vertical or horizontal use
- Reliable backflow prevention for many applications
Cons
- May not fully stop reverse flow under all conditions, best for specific setups
- California Prop 65 warning applies (standard for brass products)
- Limited to 1-inch pipe size only
The Merrill MFG CVNL100 is a 1-inch no-lead brass check valve from the 700 Series, designed for residential and light commercial plumbing applications. It is ideal for preventing backflow in water well systems, irrigation, and other setups where consistent flow direction is critical.
Its durable no-lead brass construction ensures long-lasting reliability and is IAPMO certified for safety. The abrasion-resistant O-ring provides a positive seal, and users consistently praise its quality machining and ease of installation in both vertical and horizontal positions.
The valve features threaded FNPT connections for simple integration into existing piping. With a maximum pressure rating of 200 psi, it handles typical residential water pressures with ease. Customer reviews highlight its solid build and good value for the price.
One performance consideration is that this valve may not fully stop reverse flow under all conditions, so it is best suited for setups where a complete shutoff is not required. Additionally, the California Prop 65 warning is a standard legal notice for brass products.
Overall, the Merrill MFG CVNL100 check valve offers excellent quality and reliability at a reasonable price. It is a top choice for DIYers and professionals seeking a dependable backflow prevention solution for 1-inch pipe systems.
Brand: Merrill
Model: CVNL100-A
Material: No-Lead Brass
Size: 1 inch FNPT
Maximum Pressure: 200 psi
Valve Type: Check Valve
Certification: IAPMO Certified
Pros
- Durable stainless steel body resists corrosion and wear, ensuring long service life.
- Spring-loaded design ensures fast shutoff and effective backflow prevention.
- Smooth internal finish reduces maintenance and improves flow consistency.
- High pressure and temperature ratings suit demanding applications.
- Good value for price compared to similar check valves on the market.
Cons
- Spring may be too strong for low-pressure systems, requiring more force to open and causing flow resistance.
- Not suitable for horizontal installation; must be mounted vertically with flow upward.
- Some users report sealing issues with flat metal-to-metal seat leading to pump cycling in certain low-pressure applications.
The SYWUWV 2" NPT Vertical Spring Check Valve is a robust stainless steel valve designed to prevent backflow in vertical piping systems. It is ideal for industrial, commercial, and residential applications where water, oil, or non-corrosive gases need to flow in one direction only. This valve is particularly suited for higher pressure systems due to its strong spring mechanism.
Standout features include a heavy-duty stainless steel body, a vertical lift spring design that ensures rapid closure, and a polished internal finish that reduces scaling and clogging. With a 1000 WOG rating, maximum pressure of 232 psi, and a wide temperature range, it is built for demanding environments. The 2" NPT female threads make it compatible with standard piping.
Real-world performance from customer reviews indicates that the valve works well for higher pressure liquids and is praised for its build quality. However, several users noted that the spring requires considerable force to open, making it less ideal for low-pressure air or suction-side pump applications. One professional installer reported pump cycling due to a flat metal seat design, which may not seal perfectly in all situations.
Build quality is generally high, with solid stainless steel construction and smooth threading. The valve feels substantial and is well-finished. However, the flat seat design is a point of criticism, as it relies on metal-to-metal contact rather than a softer sealing surface, which can lead to leaks or incomplete closure in low-pressure scenarios.
Overall, the SYWUWV check valve offers excellent value for high-pressure applications where durability and quick shutoff are paramount. For low-pressure systems, consider a valve with a softer seal or lighter spring. It is a reliable choice for protecting pumps and piping from backflow in vertical installations.
Brand: SYWUWV
Model: 2"-NPT
Material: Stainless Steel
Inlet Connection: 2" NPT Female
Outlet Connection: 2" NPT Female
Valve Type: Lift Check Valve
Maximum Pressure: 1600 kPa (232 psi)
Temperature Range: -20°C to 200°C (-4°F to 392°F)
Media: Water, Oil, Non-corrosive Gases (1000 WOG)
Installation: Vertical, flow upward
Unit Count: 1
UPC: 643459477773
Pros
- Robust brass construction for durability and corrosion resistance
- Stainless steel spring allows for versatile mounting (vertical or horizontal)
- High pressure and temperature tolerance (200 psi, up to 248°F)
- Easy installation with standard 2-inch female NPT threads
- Effective backflow prevention ensures system safety
Cons
- Some users may find the 2-inch size too large for smaller residential applications
- Brass may require periodic maintenance to prevent tarnishing in harsh environments
- Limited to FNPT connections, which may not suit all piping systems
The DAN SPEED Brass Check Valve is a 2-inch, female-threaded spring check valve designed to prevent backflow in fluid systems. It is particularly suited for use in water wells, pumps, tanks, and other applications where maintaining one-way flow is critical. This valve is built to deliver reliable performance, whether installed in a residential water system or a more demanding industrial setup.
One of the standout features is its stainless steel spring, which allows for both vertical and horizontal installation. This flexibility makes it easy to integrate into existing piping layouts without worrying about orientation constraints. The valve operates smoothly, providing a tight, leak-free seal that effectively stops reverse flow, protecting your equipment from potential damage.
Constructed from brass with a stainless steel spring, this valve offers excellent corrosion resistance and high-temperature ductility. It can handle pressures up to 200 psi and temperatures ranging from -10°C to +120°C, making it versatile for various applications. The brass body also has low magnetic permeability, which is beneficial in certain industrial environments.
While the valve performs well, there are a few considerations. The 2-inch size may be too large for some smaller residential projects, and the brass exterior may require occasional cleaning to maintain its appearance. Additionally, the female NPT connections are standard, but ensure compatibility with your existing pipes before purchasing.
Overall, the DAN SPEED Brass Check Valve is a solid choice for anyone needing a durable, corrosion-resistant backflow prevention solution. Its robust construction, easy installation, and reliable sealing make it a valuable component for water systems. With proper installation and maintenance, this valve should provide long-lasting service.
Brand: DAN SPEED
Model Number: (DN50) 2''
Material: Brass
Exterior Finish: Brass
Inlet Connection Type: Female Thread (FNPT)
Outlet Connection Type: FNPT
Thread Size: 2 inches
Maximum Pressure: 200 psi
Operating Temperature: -10°C to +120°C (14°F to 248°F)
Valve Type: Spring Check Valve
Number of Ports: 2
Item Dimensions: 0.5 x 0.5 x 0.5 inches
Unit Count: 1
Buying Guide
Connection Size and Thread Type
Check valves for water well pumps come in standard NPT sizes, most commonly 1 inch and 1.25 inch. Measure the diameter of your pump discharge or the pipe you’ll attach to. Also note whether the valve has male or female threads on each end, so you don’t need extra adapters.
Material: Brass vs. Stainless Steel
Brass is the traditional choice for residential well systems. It resists corrosion and is easy to machine into precise threads. Stainless steel offers greater strength and temperature tolerance, making it a better fit for industrial or high-pressure setups. In either case, choose a lead-free version for drinking water safety. See our well pump kit buying guide for more on whole-system considerations.
Spring-Loaded vs. Swing Check Valve
A spring-loaded check valve closes instantly when the pump stops, which minimizes water hammer and prevents reverse rotation of the pump. Swing-type valves rely on gravity and can be slower, so they are less ideal for submersible pumps. Look for a spring mechanism, especially if you experience pipe vibration. Some top picks, like the soft-start well pump, reduce stress further.
Installation Orientation
Most check valves can be installed horizontally or vertically, but not all are equally effective. A spring-loaded valve works in any orientation because the spring forces the disc shut regardless of gravity. Verify the flow arrow points in the correct direction before tightening. If your well casing is tight, consider a compact model like the 1-1/4″ brass valve from VERIWIS.
Final Thoughts
Choosing the right check valve for your water well pump comes down to matching the size, material, and spring design to your specific installation. For most residential applications, the 1-1/4″ Brass Check Valve for Submersible Well Pump offers a direct-fit, spring-loaded solution that installs easily even in cramped spaces. If you prefer a proven, no-lead brass option with a solid reputation, the Merrill MFG CVNL100 1″ No-Lead Brass Check Valve reliably handles standard 1-inch connections. Whichever you pick, verify your pipe threads and flow direction to ensure years of trouble-free service.
Frequently Asked Questions
What size check valve do I need for my well pump?
Measure the diameter of your pump discharge pipe. Most submersible pumps use 1-inch NPT, while some larger models require 1.25-inch. If you’re unsure, consult your pump’s manual or the what pump do I need guide.
Can I install a well pump check valve vertically?
Yes, many spring-loaded check valves like the VERIWIS and Wassermann models can be mounted horizontally or vertically. Just ensure the flow arrow points in the direction of water flow, usually upward if vertical.
How does a check valve prevent water hammer?
A check valve with a spring-loaded mechanism closes instantly the moment the pump stops, blocking any reverse flow. This rapid closure stops the pressure wave that causes banging and vibration, protecting your entire system.
Do I need a check valve on my well pump?
Absolutely. Without one, water will flow backward when the pump shuts off, spinning the pump in reverse and potentially causing damage. It also stops water from draining back, which can lead to air locks and reduce pump efficiency. For a complete system, consider a well pump kit with pressure tank.
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