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.

Download Spec. Sheet (PDF)

Application

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

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

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