No. 300

Buna-S Rubber Poppet for General Purpose Applications

Description

The No. 300 check valve is made of a one-piece cast brass body. Designed to operate in any position, a sensitive spring has been added to close the poppet automatically. The rubber poppet is fully-formed around a solid steel insert to provide greater strength in commercial applications. Each valve is tested twice for casting integrity and backflow prevention. All valves are 100% American-Made and built to last.

Application

Used as an all purpose check valve for multiple applications, including cold and warm water, ethylene, glycol and air.

Flow Rate (Cv)
Size GPM
3/8" 2
1/2" 3
3/4" 5
1" 14
1-1/4" 21
1-1/2" 38
2" 59
2-1/2" 69
3" * 185
3" ** 69
4" 240

Cv is flow (GPM) with a 1 psi differential pressure.

Material Specifications
Part Name Material
Body Cast Bronze C84400
Stem 303 Stainless Steel
Poppet Buna-S Rubber
Spring 302 Stainless Steel
Cup Washer 304 Stainless Steel
Locknut 18/8 Stainless Steel
Country of Origin Made in the USA

Operational Specifications
Max. Temperature 225°F
Working Pressure 400 psi
Cracking Pressure 1-2 lbs.
Opt. Cracking Pressure 1/2, 5, or 10 lbs.

Dimensions
Pipe Size Part Number Over-all Length Valve Diameter Valve Weight
3/8" 300-038 2.63" 1.16" 0.50 lb.
1/2" 300-050 2.69" 1.40" 0.45 lb.
3/4" 300-075 3.31" 1.62" 0.80 lb.
1" 300-100 3.69" 2.00" 1.05 lbs.
1-1/4" 300-125 4.57" 2.41" 1.80 lbs.
1-1/2" 300-150 4.88" 2.69" 2.25 lbs.
2" 300-200 5.56" 3.34" 3.10 lbs.
2-1/2" 300-250 6.79" 3.81" 7.15 lbs.
3" * 300-300-F 7.40" 4.71" 11.80 lbs.
3" ** 300-300 6.79" 3.81" 6.60 lbs.
4" 300-400 10.00" 5.80" 21.70 lbs.

NPT threaded. **New valve: Standard female threads on both ends, Cv factor of 185. **Original valve: 2-1/2" valve body with 3" male thread on both ends, Cv factor of 69.

Notes

Questions? Ready to Order?