FNW®

681 3 in. Epoxy Coated Cast Iron Wafer Check Valve

Part #FNW681M  |  Manufacturer Part #FNW681M

Valve Size

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Product Details

  • Non-slam (spring actuated) check for water or clean fluids
  • Vertical or horizontal installation
  • Replaceable drip tight resilient seat
  • Renewable disc
  • Prevent water hammer in well pumps
  • Silent check valves were developed to eliminate water hammer due to water flow reversal in clear water pump applications
  • Valve opens when upstream pressure exceeds downstream pressure by 1/4 to 1/2 psi
  • An internal spring closes valve just prior to an equalizing pressure on both sides providing a quiet and shock less valve closing
  • Designed for use with Class 125/150 flanges
  • Use flat-faced metal flanges and full-face gaskets only

Documents

Specifications

ANSI Specifications: ANSI B16.1

API Specifications: API 598

Coating: Epoxy

Collection: 681

End Connection 1: Wafer

End Connection 2: Wafer

End Connections: Wafer

Fitting Size 1: 3 in

Fitting Sizes: 3 in

Installation Type: [Vertical Mount, Horizontal Mount]

Length: 3-1/8 in

MSS Specifications: MSS SP-6

Material: Cast Iron

Maximum Pressure: 200 psi

Maximum Temperature: 176

Minimum Temperature: -4

NSF Certified: No

Pressure Class: 125#

Recommended Valve Application: Water

Temperature Range: -4 to 176 Deg F

UL Listed: No

Valve Body Style: Wafer

Valve Disc Material: [Aluminum, Bronze]

Valve Seat Material: EPDM

Valve Size: 3 in

Valve Type: Check Valve