Grayloc® Non-Slam Nozzle Check Valves
Delivering superior performance and reliability in a maintenance-free design.
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.
Sized to eliminate disc chatter
Eliminates reverse flow and hammer
Optimized for low pressure loss
Unique dual-spring design enables fast dynamic response
Technical Specifications
Nominal pipe size | 1 to 72 in |
End connections | Grayloc 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 rating | Suitable for ANSI Class 150 up to 10,000 psig |
Design temperature range | Per material limit (full metal construction) |
Flow orientation | Up, 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 seat | All API trims. Custom trims available upon request. |
Disc seat | All API trims. Custom trims available upon request. |
Internal coating | Fusion bonded epoxy or as specified by customer |
External coating | Per 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 |
Product Documents
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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