Swing Check Valves provide automatic backflow prevention in piping systems where reverse flow could damage pumps, disrupt process flow, or create maintenance issues downstream. The CV-S Series uses a hinged disc design inside a stainless steel threaded body to allow forward flow with low resistance and close automatically when flow reverses.
This series is offered in 1/2 inch to 2 inch female NPT sizes with a stainless steel 304 body and trim, plus PTFE sealing elements. As a result, it fits water, air, fuel, and other compatible media in general industrial utility and process piping.
Available Configurations
| Configuration Item | Details |
|---|---|
| Valve type | Swing check valve |
| Configuration | 2-way, automatic check valve |
| Flow direction | Unidirectional |
| Check mechanism | Hinged disc |
| Body material | Stainless steel 304 |
| Components/trim | Stainless steel 304 |
| Seal material | PTFE |
| Connection type | Female NPT |
| Available sizes | 1/2 inch, 3/4 inch, 1 inch, 1-1/4 inch, 1-1/2 inch, 2 inch |
| Body code | S, stainless steel body |
Technical Specifications
The CV-S Series is a threaded stainless steel swing check valve for backflow prevention in water, oil, and gas service under non-shock conditions. In operation, its hinged disc supports forward flow with relatively low resistance, and it closes automatically when flow reverses.
| Specification | Details |
|---|---|
| Valve type | Swing check valve |
| Configuration | 2-way |
| Flow direction | Unidirectional |
| Maximum operating pressure | 200 WOG |
| Media temperature range | -4 to 356°F |
| Pipe size range | 1/2 inch to 2 inch |
| Connection type | NPT female |
| Body construction | Investment-cast stainless steel |
| Pressure test/inspection | API 598, EN12266-1 |
| Compliance | PED 2014/68/EU, Casting approved AD2000-W0 |
Dimensions
The CV-S Series covers standard threaded line sizes from 1/2 inch through 2 inch, so it supports compact inline installation where backflow prevention is needed without adding actuator footprint or external controls.
| Pipe Size | H (in) | L (in) | Ø D (in) | Weight (lb) |
|---|---|---|---|---|
| 1/2 inch | 1.69 | 2.56 | 0.50 | 0.65 |
| 3/4 inch | 2.09 | 3.15 | 0.75 | 1.09 |
| 1 inch | 2.36 | 3.54 | 1.00 | 1.65 |
| 1-1/4 inch | 2.36 | 4.13 | 1.25 | 2.50 |
| 1-1/2 inch | 2.95 | 4.72 | 1.50 | 3.19 |
| 2 inch | 3.11 | 5.51 | 2.00 | 5.05 |
Pressure, Temperature, and Media Fit
This series handles water, oil, and gas service up to 200 WOG under non-shock conditions, with a media temperature range of -4 to 356°F. Therefore, it works across many utility and general process lines that need passive backflow prevention without external actuation.
Typical media references include water, air, fuel, and other compatible service fluids. In addition, PTFE sealing and stainless steel construction support broad compatibility, but users should still confirm the actual media, pressure cycle, and temperature profile before final selection.
Design and Performance
- Hinged disc design supports automatic reverse flow shutoff
- The forward flow path helps reduce resistance through the valve
- Stainless steel 304 body and trim support corrosion-resistant service
- PTFE sealing elements support compatible utility and process media
- Investment-cast body construction supports durable inline service
- Female NPT threaded ends fit standard piping connections
- Recognized pressure and sealing standards support inspection and verification
- Compact inline design eliminates the need for an external actuator
Typical Uses
| Application / System | Typical Use |
|---|---|
| Pump discharge lines | Preventing reverse flow back toward the pump |
| Water distribution systems | Protecting downstream piping from backflow events |
| Cooling water and circulation systems | Maintaining one-way flow in recirculating lines |
| Compressed air and gas distribution systems | Preventing reverse air or gas flow in utility networks |
| OEM equipment and skid-mounted systems | Adding compact passive backflow protection |
| Industrial utility water systems | Keeping service water flow moving in one direction |
| Building water supply and booster systems | Reducing reverse flow risk in supply branches |
| Fire protection and sprinkler pipelines | Providing passive backflow control in compatible sections |
| Chemical transfer lines for mild to moderately corrosive media | Preventing reverse movement of compatible process media |
| Boiler feedwater and condensate systems | Supporting one-way flow where service temperature remains within range |
Material Breakdown
| Component | Material |
|---|---|
| Body | Stainless steel 304 |
| Disc | Stainless steel 304 |
| Hanger pin | Stainless steel 304 |
| Plug gasket | PTFE |
| Bonnet | Stainless steel 304 |
| Gasket | PTFE |
Technical Resources
Review pipe size, pressure range, and media compatibility before final selection. In most check valve applications, the critical buyer question is not the overview copy, but whether the pressure, temperature, materials, and one-way flow requirement match the service.
- Download the Swing Check Valve spec sheet
- Confirm pipe size and thread connection
- Review pressure and temperature limits
- Check media compatibility for stainless steel and PTFE
- Contact Atlantic Valves for product support and quoting
Technical Note
These valves are not intended for use in medical life support, combustion, aviation, aerospace, automotive, or similar applications. Review material compatibility before final selection, especially where media chemistry, pressure cycling, or elevated temperature could affect service life.
