Armstrong International is a leading US industrial valve brand known worldwide for innovative fluid control solutions. CVW40SS wafer lift check valve is a flagship product in the CVW-40 series, designed for modern industrial piping systems. The valve uses an advanced lift design to automatically prevent reverse flow, helping ensure safe and efficient system operation. Whether used in high-temperature steam service or everyday hot water circulation systems, CVW40SS delivers reliable protection against equipment damage, energy waste, and production interruptions caused by reverse flow.

CVW40SS features a compact, lightweight design and an all-stainless-steel construction for excellent corrosion resistance. It supports PN40 high-pressure service and a wide operating temperature range from -25°C to 425°C. A unique cam positioning design simplifies installation and allows integration in only a few minutes, making the valve suitable for various flanged connection applications. With zero-leakage performance and high reliability, it is a preferred check valve solution for the chemical, energy, manufacturing, and HVAC industries.

Key Specifications and Parameters

The CVW40SS series is available in multiple sizes to meet different flow rates and system requirements. Key technical parameters include:

• Nominal size (DN): 15mm (1/2″) to 100mm (4″), covering applications from small piping to large industrial pipelines.

• Connection type: Wafer flanged connection (RF raised face or FF flat face), compatible with standard flanges below PN40 (HG20592).

• Pressure rating:

Maximum working pressure at ambient temperature: 4.0 MPa.

• Shell test pressure: 6.0 MPa.

• Minimum opening pressure: approximately 0.01 MPa (101.93 mm water column).

• Temperature range: -25°C to 425°C (steam without shock loading).

• Materials:

Valve body, disc, and bonnet: ASTM A351 CF8 stainless steel (high strength and corrosion resistance).

• Spring: 304 stainless steel (for fast, reliable closing).

• Reference dimensions and weight table (dimensions: mm; weight: kg):

Nominal size	A	B	C	D	Weight
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

These specifications enable CVW40SS to operate reliably under high-pressure and high-temperature conditions. The valve is suitable for hot water, condensate, oil, and other non-corrosive media.

Product Advantages

CVW40SS is more than a basic check valve. It incorporates Armstrong engineering expertise to provide multiple benefits:

• Effective protection: Media pressure automatically opens the disc, while the spring closes it immediately when flow stops. This minimizes reverse-flow risk and protects downstream equipment such as pumps and compressors from water hammer.

• Easy installation: The compact wafer design requires no additional supports. The cam mechanism automatically centers the valve and allows horizontal, vertical, or inclined installation, reducing installation time and labor costs.

• Durable and reliable: The all-stainless-steel construction resists corrosion and fatigue for a long service life of up to several decades. Maintenance requirements are low, with only periodic cleaning of the sealing surfaces required.

• Cost-effective: The compact, lightweight design reduces material consumption. Compatibility with multiple media and a strong price-to-performance ratio make the valve suitable for budget-sensitive projects.

• Safe and compliant: The valve complies with international standards, and the shell is high-pressure tested to support safe operation in demanding industrial environments. It is not suitable for pulsating fluid service, which also helps avoid potential failures in such applications.

Compared with conventional check valves, CVW40SS offers faster response and lower leakage, making it an ideal choice for upgrading existing systems.

Applications

CVW40SS is widely used in industrial applications requiring reverse-flow prevention:

• Steam and hot water systems: Used in boiler circulation and heat exchanger systems to prevent hot water or steam backflow and improve energy efficiency.

• Condensate recovery: Installed downstream of steam traps to prevent condensate backflow and optimize recovery processes.

• Oil and chemical piping: Handles lubricating oil and non-corrosive chemicals, ensuring one-way flow and reducing contamination risks.

• HVAC and data centers: Protects cooling circulation systems against reverse flow, maintains stable temperatures, and supports green building certifications.

• Energy and manufacturing: Provides reliable fluid control in power plants, petrochemical facilities, food processing operations, and other industrial applications.

From small factories to large infrastructure projects, CVW40SS integrates seamlessly to improve overall system performance.

Installation and Maintenance Guide

Installation Steps

• Preparation: Confirm that the system is depressurized and shut down upstream equipment. Check that the arrow on the valve body matches the direction of media flow.

• Positioning the valve: Place CVW40SS between two flanges and insert standard gaskets and long bolts.

• Securing and centering: Rotate the valve body so that the cam contacts the bolts and automatically centers the valve. Tighten the bolts in a diagonal sequence, using the flange standard for torque guidance.

• Testing: Increase pressure gradually and check for leaks. After installation, avoid locations near pulsation sources.

Maintenance Recommendations

• Routine inspection: Clean the sealing surfaces quarterly and monitor the condition of the disc and spring.

• Component replacement: If the spring must be replaced, remove the bonnet with the valve oriented upward, install the new component vertically, and tighten it securely. Drain the system before starting work.

• Troubleshooting: Leakage is often caused by dirt and can be resolved by cleaning. Replace the spring promptly if it fails. Refer to the official manual for professional diagnosis.