What is API 594 check valve?

API 594 is the American Petroleum Institute standard for check valves in flanged, lug, wafer, and butt-welding configurations. It covers swing check, tilting disc, and dual plate (wafer) check valves. API 594 specifies design, materials, dimensions, testing, and marking requirements. It is widely used for refinery, pipeline, and marine applications.

What sizes are NAB swing check valves available in?

NAB swing check valves per API 594 are available from 3 inch (DN80) to 24 inch (DN600). Common sizes for seawater service include 3" and 6". Body styles include flanged, wafer, and lug. Pressure class is typically 150 (PN20). Larger sizes available on request.

What is the price of NAB swing check valve?

NAB swing check valve prices in INR: 3" costs approximately ₹69,872, 6" costs approximately ₹1,65,649. Prices are ex-works India and include hydrostatic testing and EN 10204 3.1 material certificates. Contact Supreme Valves for confirmed pricing and project quantities.

Backflow Prevention

NAB Swing Check Valve – API 594 for Seawater

Name: NAB Swing Check Valve API 594 for Seawater Service
Brand: Supreme Valves
SKU: SV-NABSWINGCHECKVALVEAP
Price: 69872 INR
Availability: InStock
Rating: 4.8 (127 reviews)

Nickel Aluminium Bronze (NAB) swing check valves (NRV) manufactured to API 594 standard for seawater backflow prevention. Body and disc in ASTM B148 C95800. Class 150. Sizes 3" to 24". Ideal for pump discharge, seawater cooling systems, and marine applications.

Quick Summary

NAB Swing Check Valve = Non-return valve (NRV) made from Nickel Aluminium Bronze (ASTM B148 C95800). Allows flow in one direction, automatically closes on reverse flow. API 594 design. Used for backflow prevention in seawater systems. Available 3" to 24". No operator needed - automatic operation. Applications: pump discharge protection, seawater cooling, desalination, marine ballast.

NAB Swing Check Valve API 594 Nickel Aluminium Bronze C95800 Seawater NRV

In Stock One-Way Flow

Key Specifications

Design Standard: API 594

Pressure Class: 150 (PN20)

Body Material: ASTM B148 C95800

Disc Material: ASTM B148 C95800

Hinge Pin: Monel / Super Duplex

Size Range: 3" to 24"

End Connection: Flanged ASME B16.5

Operation: Automatic (No operator)

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How Swing Check Valve Works

Forward Flow

Fluid pressure pushes disc open, allowing flow through the valve. Disc swings on hinge pin.

Reverse Flow

When flow reverses, disc swings closed and seals against seat, preventing backflow.

Automatic

No external operator needed. Valve operates automatically based on flow direction.

Frequently Asked Questions

What is a swing check valve?

A swing check valve (NRV) is an automatic valve that allows flow in one direction only. It has a hinged disc that swings open with forward flow and closes automatically when flow reverses. Used for backflow prevention and pump protection.

Why use NAB swing check valves for seawater?

NAB provides excellent corrosion resistance to seawater, anti-biofouling properties, superior erosion resistance, and self-healing oxide layer. Long service life without maintenance in marine environments.

What sizes are available?

NAB swing check valves per API 594 are available from 3" (DN80) to 24" (DN600). Common sizes: 3" and 6". Flanged, wafer, and lug styles. Class 150 pressure rating.

Need NAB Check Valves for Backflow Prevention?

We supply to major EPC contractors. EN 10204 3.1 MTCs. Third-party inspection available.

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Pricing – Swing Check Valve (Class 150)

Indicative unit prices in INR (ex-works India). Includes hydrostatic testing and EN 10204 3.1 MTCs. Volume discounts available for project quantities.

Size	Standard	Operation	Material	Unit Price (INR)
3"	API 594	—	ASTM B148 C95800 (NAB)	₹69,872
6"	API 594	—	ASTM B148 C95800 (NAB)	₹1,65,649

* Prices are indicative and subject to change. Contact us for confirmed pricing and delivery schedules. GST extra as applicable.