Grayloc® Non-Slam Nozzle Check Valves

Delivering superior performance and reliability in a maintenance-free design.

Non-Slam-Nozzle-Check-Valves

Our Non-Slam Nozzle Check Valve includes an optimized flow profile and unique dual-spring design to solve operational issues, including pressure loss and reverse flow, common with alternative check valve designs. Low friction movement, low part weight, and short disc stroke ensure stable, maintenance-free operation, even in low flow applications. Our customizable and inherently fire-safe valves can be installed horizontally, vertically, and diagonally to meet your most challenging operational needs.

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Sized to eliminate disc chatter

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Eliminates reverse flow and hammer

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Optimized for low pressure loss

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Unique dual-spring design enables fast dynamic response

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Technical Specifications

Nominal pipe size1 to 72 in
End connectionsGrayloc clamp connectors and compact flanges, ASME B16.5 flanges, ASME B16.47 flanges, ASME B16.25 weld ends, NORSOK L-005 compact flanges, AS4087 flanges, and API 6A flanges

Other end connections available upon request
Design pressure ratingSuitable for ANSI Class 150 up to 10,000 psig
Design temperature rangePer material limit (full metal construction)
Flow orientationUp, down, diagonal, and horizontal
Body (forged or cast)Nickel alloys, carbon, low-alloy, stainless and duplex stainless steels
Disc (forged or cast)Nickel alloys, carbon, low-alloy, stainless and duplex stainless steels
Body seatAll API trims. Custom trims available upon request.
Disc seatAll API trims. Custom trims available upon request.
Internal coatingFusion bonded epoxy or as specified by customer
External coatingPer customer specifications
ASME B16.34, Valves - Flanged, Threaded, and Welding End
ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves
AS4794, Non-Return Valves for Waterworks Purposes
API 6A, Specification for Wellhead and Christmas Tree Equipment
API 6D, Specification for Pipeline Valves
API 594, Check Valves: Flanged, Lug, Wafer and Butt-Welding
API 598, Valve Inspection and Testing
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Typical Applications

  • A highly reliable, maintenance-free design coupled with a low pressure loss flow profile is ideal for integration in compressor applications including reciprocating compressors
  • One-piece body and full metal construction remove leak paths while providing simplified, predictable use in cryogenic applications
  • Full metal construction is available in a wide variety of materials which are easily tailored to the metallurgical requirements of critical processing infrastructure at desalination facilities
  • Maintenance-free design supports reliable, long-term use in a variety of fluid transmission applications
  • Maintenance-free design and high cycle capability supports critical nuclear system applications
  • One-piece valve body and integral seat are ideal for the severe service processes found in typical refining applications
  • One-piece body and full metal construction remove leak paths while providing simplified, predictable use
  • Easily integrated into subsea infrastructure including pipelines, flowlines, manifolds, and pig launchers and receivers
  • Fast dynamic response ensures that no water hammer occurs, protecting critical piping and transmission components

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