Product Overview

Armstrong Check Valve (ONE-WAY VALVE), also known as one-way valve or non-return valve, is designed to effectively prevent backflow in pipelines. Specifically engineered for unidirectional flow systems, it only allows media to flow in one direction, preventing safety incidents caused by reverse flow. The Armstrong CVW40/CVW40SS Series Wafer Lift Check Valve is suitable for hot water, condensate, oil and various other fluids, offering connection sizes from DN15 to DN100 to flexibly meet different flow requirements. The innovative "cam" design on the valve body makes installation more convenient and efficient - simply rotate the valve body until the "cam" contacts the flange bolt to ensure precise centering in the pipeline.

Working Principle

The CVW40/CVW40SS Series Wafer Lift Check Valve is an automatic valve requiring no external power. The valve opens by the pressure of the media itself - when media flows in the designated direction, its pressure overcomes the spring force to push the disc open, allowing media to pass through. When media flow stops or reverse flow occurs, the spring's restoring force quickly pushes the disc closed, blocking backflow and ensuring normal pipeline system operation.

Main Materials

Component	Material
Body/Disc/Cover	ASTM A351 CF8
Spring	304 Stainless Steel

Operating Parameters

Parameter	Value
Max Working Pressure	4.0 MPa
Max Working Temperature	425°C
Min Working Temperature	-25°C
Design Pressure	4.0 MPa
Shell Test Pressure	6.0 MPa

Minimum Opening Pressure

(Unit: KPa, 1KPa = 101.93mm water column)

Nominal Diameter	DN15	DN20	DN25	DN32	DN40	DN50	DN65	DN80	DN100
3/10 (a)	8.26	6.16	4.01	5.19	4.05	2.19	3.65	2.25	2.23
Horizontal Installation	6.85	4.98	3.02	4.25	3.02	1.5	2.8	1.43	1.28
Vertical Installation (Flow Upward)	5.44	3.8	2.01	3.31	1.99	0.83	1.91	0.61	0.32

Dimensions and Weight

Nominal Diameter	A (mm)	B (mm)	C (mm)	D (mm)	Weight (kg)
DN15	61	30	42	15	0.2
DN20	78	30	52	20	0.33
DN25	78	30	66	25	0.44
DN32	91	35	76	32	0.7
DN40	103	35	86	40	0.76
DN50	119	40	99	50	1
DN65	154	50	125	65	2.1
DN80	158	60	134	80	2.4
DN100	189	75	160	100	4.3

Connection Type

Wafer flange connection conforming to HG20592 PN40 RF standard, ensuring sealing integrity and structural stability, compatible with industrial pipeline system installation requirements.

Installation Instructions

1. The CVW40/CVW40SS Series check valve must be installed according to the flow direction arrow marked on the valve body, ensuring media flow direction matches the arrow direction.
2. Spring-loaded valves can be installed in any orientation without angle restrictions, adapting to various pipeline layouts.
3. Non-spring valves can only be installed on vertical pipelines and must strictly follow the upward flow direction requirement to ensure proper valve operation.

Ordering Information

1. When ordering, clearly specify the product model (CVW40/CVW40SS Series) and nominal diameter (DN15-DN100).
2. For special requirements, provide detailed information including media type, maximum working pressure, and maximum working temperature.
3. For E and F types, NPT standard is supplied by default unless otherwise specified at the time of ordering.