LUG Dual Plate Check Valve

 

GZP dual-plate check valves are manufactured according to the latest edition of API 594/API 6D and tested to API 598 standards. All valves from GZP VALVE undergo strict 100% testing before shipment to ensure zero leakage.

 

The dual-plate check valve, also known as a reflux valve, backpressure valve, or one-way valve, operates automatically by opening and closing in response to the flow of media through the pipe. It is widely used in industries such as petroleum, chemical, textile, power, marine, and metallurgy.

 

The dual-plate check valve consists of a body, plate, stem, and spring, among other components. It can be connected using wafer, flange, or lug connections. Its shorter structural length compared to general check valves makes it particularly suitable for installations with limited space. The short closing stroke of the plate significantly reduces water hammer pressure.

 

The main construction features of the GZP Dual-Plate Check Valve include

● A retainerless body design with no external body penetrations, eliminating the possibility of outside leakage. The disc assembly is secured in place by a high-strength key.

● End gasket surfaces are uninterrupted, with no screws or lock pins breaking the gasket surface; no gasket restrictions are required.

● Seat faces are lapped for a smooth finish and superior sealing.

● High torsion Inconel springs ensure quick closing.

● Each valve is shell and seat pressure tested per industry standard API 598.

● Available in Wafer, Lug, and Double Flange styles.

● Each valve has a unique certification number traceable to the valve certification sheet, which includes MTR data, pressure test reports, and inspection reports.

 

Features and Benefits

● Retainerless design is supplied as standard

● API 594 face-to-face dimension

● Suitable for ANSI B16.5 flanges, NPS 2-24 (DN 50-600)

● Suitable for ANSI B16.47 Series A flanges, NPS 26 (DN 650) and larger

 

Technical Data
Design Standard	API594/API6D
Body Material	Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel. etc.
	NACE MR-01-75/NACE MR-01-03 Special Requirements
Pressures range	ANSI 150 ~ANSI 2500 ,PN10~PN420
Size range	DN50(2") ~DN1200 (48")
Face to Face	ANSI B16.10,EN 558,DIN3202
WAFER Ends	ASME B16.5 ≤ DN600 (24") ASME B16.47 A ≥ DN650 (26")
	BS 4504, DIN 2543-2545, EN1092
Butt-Weld BW Ends	ASME B16.25 ,DIN 3239,BS 2080, EN 12627
Temperature range	-29°~ 425°C
Design Feature
Construction	LUG type
Disc Type	Dual plate, single plate, plug type
Seat Sealing	Integral body seat,seat welded and overlaid
Fire Safe Design	API 607, BS 6755
Inspection & Test
Visual Inspection	MSS SP-55
Material Inspection	PMI Test----Chemical Analysis
	HB Test---Hardness Test
	UT---Ultrasonic Test
	RT---RadiographicTest
	MT---Magnetic Test
	NDT Test Non-destructive
Dimension inspection	According to drawings
Valve Inspection and Test	API 598, DIN 3230, EN 12266, BS 5146

 

Notes:

●The optional configuration of a full flange or lug flange shall follow the manufacturer's standard unless specified otherwise by the purchaser.

● Unless specified otherwise in the purchase order, bolt holes will be through-drilled.

 

Installation:

Pre-Installation Checklist

● Ensure that working conditions (pressure and temperature) are within the specified capacity of the product being installed. Please refer to the Engineering Specification Sheet for each Check Valve model to determine these values.

● Ensure that the construction material of the Check Valve is compatible with the media flowing in the pipeline. Additionally, ensure that the service media is filtered to remove unwanted debris prior to entering the Check Valve. If the service media is not sufficiently clean, debris particles can prevent the Check Valve from sealing correctly and degrade overall performance over time.

● Inspect sealing surfaces to ensure they are clean and smooth; no nicks or cuts should be present. The pipeline should also be checked for proper alignment. Check Valves should never be utilized to realign an existing piping system.

● For efficient function and improved service life, recognized piping standards stipulate placing Check Valves 5 to 10 pipe diameters away from turbulence-producing devices (elbows, pumps, tees, expansions, reductions, and swages).

 

Dual Plate Check Valves are designed for steady flow conditions and are not recommended for reciprocating pumps, compressors, or other physical/thermal shock-load applications. In such applications, the Check Valve will not perform efficiently and will ultimately fail.

 

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