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| Which Check Valve Should I Use? |
| Check valves are made in many types and configurations. Each type has unique desirable features, and some features are not necessary for your applications. APCO makes six (6) types and fourteen (14) styles of check valves, therefore, we offer the design engineer honest, objective application data so he may select the correct check valve for your installation. Check valves look different, but function the same. They allow flow thru in forward direction, and no flow (check) reverse. However, closing characteristics, flow area, head loss and cost for each type check valve, varies greatly. First observe these differences then select the check valve best suited for your application. |
| Automatic Control Check Valves |
8000 Series |
Excellent where Pump Discharge Control is essential, due to high velocities (10 FPS or more), and high pressures (over 100 PSI). Electrically operated, to permit remote control of automatic pump stations, features: Shut-Off Valve - Throttle Flow Valve - Control Check Valve - Drain Valve and during electrical power loss, this valve will automatically shut-off, without assistance. Equipped with manual override and replaceable Buna-N-Seat. Body-Cast Iron or Ductile Iron, Disc-Ductile Iron, Shaft-High Strength Stainless. Ratings 125#, 250#, 300# class.
Availability 20 weeks
Sizes 6" thru 48". |
| Slanting Disc Check Valves |
800 Series |
The most reliable and efficient check valve for the engineer. The disc pivot point is off center, a precise constructed feature to slow the closing of the disc. Split body design increased flow area around the disc 40%, hence, the lowest head loss. Seating is metal to metal. Valve life rating minimum 25 years. Available as a free swing check; free open control and close; or control open and close. The body is available in Cast Iron, Ductile Iron, Cast Steel or Stainless Steel. Pivot Pins and Seats-Bronze or Stainless. Highly recommended for maximum efficiency in Power and Water Pumping Stations. Ratings 125#, 250#, 300#, 600# class. Cast Iron from stock.
Steel 16 weeks.
Sizes 2" thru 72". |
| Cushioned Swing Check Valves |
6000 Series |
Heavily constructed, exceeds AWWA standards used on Water or Raw Sewage Pumping Stations. Available with Air Cushion (Fast Closing), or Oil Cushion (Slow Closing) to prevent slam and water hammer. Flow area is full ported and equal to pipe area. All internals easily replaced thru top cover without removing valve from the pipeline. Ratings 125#, 150#, 250#, and 300# class.
Availability stock thru 16 weeks.
Sizes 2" thru 66". |
| Rubber Flapper Swing Check Valves |
100 Series |
Unique Simple Design - no moving parts. The Flapper does not swing from a Hinge Pin, it flexes open. The seat is on a 45 degree angle. The Flapper travels 35 degrees from open to close, very fast, and before column reversal can occur, hence, it's non-slamming. The flapper is made of synthetic rubber without any moving parts. The valve can be buried and requires no regular maintenance. Recommended for Water, Sewage, Gas, Oil and Rubber lined for Chemicals. Cast Iron Body rated 125# class 175 PSI working pressure.
Stock to 4 weeks.
Sizes 2" thru 36" (larger sizes available). |
| Double Door Check Valves |
9000 Series |
Very short length, results in lowest purchase and installation costs. Double doors are spring loaded for fast non-slam shut-off against rubber seat in the body. Recommended for Refineries, Petro Chemical Plants, and Water Pump Stations, Body and Door material-Iron, Steel, Bronze or Stainless. Spring and Hinge Pin-Stainless. Body Seal-Buna-N or other materials for higher temperature rating. Ratings 125#, 250#, 300#, 600#, 900#, 1500#, 2500# class.
Stock to 12 weeks.
Sizes 2" thru 72". |
| Silent Check Valves |
300 Series
600 Series |
Excellent to prevent Water Hammer, in multi-story buildings and vertical turbine pump installations, when pumping from a well to an elevated reservoir. The Valve closes, SILENTLY! Low in cost, reliable and requires no regular maintenance. Principle of operation: When pump stops, spring forces disc closed instantly against slight pump head at zero velocity, (theoretically a static condition) hence, SILENT CLOSURE! Body - Cast Iron, Ductile Iron, Cast Steel, Stainless Steel or Bronze. Internals - Bronze, Stainless. Ratings 125# thru 600# class.
Available Immediate or maximum 8 weeks.
Sizes 1" thru 10". |
For more detailed information on all our check valve options please click the following link
Apco Check Valves Technical Data
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