How does a Wafer Swing Check Valve work?

The valve’s wafer-like profile makes it a great choice for systems requiring short takeout lengths. Wafer check valves work much in the same way as swing check valves. Like swing check valves, wafer check valves are comprised of a disc and a seating arrangement. When material flows in one direction, the flow lifts the disc from the seating arrangement. This allows the material to flow through the valve. If and when flow reverses direction through the valve, the flow of material pushes the disc back into the seating arrangement, thus closing the valve off from the flow of material.
Wafer check valves are designed to be slim and unlikely to clog. This design makes them ideal for use with materials containing solid particles or debris. This type of valve can be mounted either vertically or horizontally, as long as the back pressure required to seat the check valve is sufficient. Mechanisms are available to help provide assist valves in case back pressure is insufficient.

Applications of Wafer Swing Check Valve

• Steam
• Hot & Cold Water
• Power & Heat Engineering
• Pressurized Air
• Industrial Technologies
• Fluids without Acidity or Alkalinity Properties

Advantages of Wafer Swing Check Valve

• Minimizes piping support with the compact wafer-style body. This range of wafer check valves is two to three times lighter than traditional full-bodied check valves.
• To meet special applications and service conditions, These valves can be offered with many different options, such as silicone-free cleaning, oxygen-cleaning, vertical service, left-hand operation, levers, weights, and cushions.
• For media containing fibrous matter or caustics, These offer an external spring that eliminates the spring from the flow path. This will prohibit the possibility of fiber wrapping around the spring or a chemical attack on the spring.
• Maintenance is minimal with the field-replaceable O-ring seat, available in all styles and sizes.

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This valve can be installed at the water outlet of the pump or the water outlet pipe to prevent backflow of the medium.

Features：

1. The switch can be up to 100,000 times;
2. Full flow area, low flow resistance;
3. Less likely to accumulate debris;
4. Simple structure and convenient maintenance.

Principle：

The sealing ring of this valve adopts the tilting design, and the closing time is short, which can reduce the water hammer pressure.

Installation and Commissioning：

This valve can be installed in sewage. For specific use, please consult Zeco Valve Group.

Product scope, Standards & Materials

Size Range: 2″~48″

Pressure Rating: 150LB~2500LB

Face-to-Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension :AMSE B16.1/16.42, AS4087, EN1092-2

Inspection and Test: API 598

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What is a Stainless Steel Swing Check Valve?

Stainless steel swing check valves are designed and manufactured strictly to International Standards API 6D, BS1868, ASME B16.34 or Equivalent, o reduce the flow resistance and pressure drop to the minimum possible extent, which is suitable to be mounted in horizontal position only, lapped and screwed in seat ring ensures tight shut off and long duration service. Valve’s disc is perfectly designed, accurately machined, and guided for efficient automatic shut-off at zero pressure, with a feature of compact structure & Low emission service. In both Swing & Piston Constructions.

ZECO is a professional manufacturer of swing check valves, stainless steel materials can be selected as ASTM A351 CF8, ASTM A351 CF8M, ASTM A351 CF3, ASTM A351 CF3M, UNS S32205 or super stainless steel materials, and so on. ZECO is very strict about the testing of raw materials. All stainless steel materials must undergo spectral testing and physical analysis when they arrive at the factory, and only when they meet the requirements of international standards can they be allowed to enter the factory and start the formal processing process. ZECO’s stainless steel swing check valve opens the disc fully in the line to prevent disc media flow and increase flow resistance. The swing check valve is the most important process requirement in the disc sealing surface and valve body sealing surface because there is no external force to help seal, so only the disc and valve seat sealing surface can be closely matched to achieve the complete sealing state, at the same time, according to the requirements of the working conditions can change the material of the disc sealing surface to achieve the desired effect.

Features of Stainless Steel Swing Check Valve:

• The material of ZECO stainless steel swing check valve has been strictly tested to meet international standards;
• The hinge and hinge pin of ZECO stainless steel swing check valve is provided and mounted so as to permit full movement of the disc. And ZECO makes sure the disc is fully opened in the body;
• The seat of ZECO stainless steel swing check valve is renewable;
• Standard swing disc type, used in the horizontal position for liquid service application or used in a vertical position where the liquid flow from bottom to top.
• Design & Manufactured to API 6D, BS1868, or ASME B16.34;
• Face to Face Dimensions to ASME B16.10;
• Structured in Bolted Cover;
• Optional Bypass system & Counter-weight Assembly；
• Rapid closing and flexible actions of the valve disc；
• Small closing impact, water hammer is not liable to be generated；
• Swing type disc；
• Can be designed with a Damping Cylinder.

Product Range of Stainless Steel Swing Check Valves

• Nominal diameter:1/2″～60″
• Pressure range: Class150 –1500
• End Connection: RF, RTJ, BW
• Working temperature:-46℃～+560℃

Should the Swing Check Valve Be Installed Vertically or Horizontally?

We hear many people ask, “Can swing check valves be installed vertically?”

The simple answer to that question is yes, swing check valves can be installed in both directions. But to be very clear, installing a swing check valve on a horizontal pipeline can actually look like the valve is vertical. When you install a check valve on a vertical pipeline, the valve will be horizontal.

However, it’s most common to install a swing check valve on a horizontal pipeline. When people are asking if swing check valves can be installed vertically, they are usually referring to the pipeline.

How to Install Swing Check Valves Vertically

Installing a swing check valve on a vertical pipeline doesn’t change the installation process, but you need to make sure the flow arrow points up. This enables water flow through the pipeline to travel upwards, and prevents gravity from pulling it back and contaminating the water supply.

Although there are different sizes and styles of swing check valves, you can look at this diagram to see how it works from the inside.

Steps for Installing Swing Check Valve

The work of attaching a swing check valve to a pipeline is extremely easy, but you’ll find that it’s worth your time to go slowly and check things carefully. It’s much easier to catch a problem during installation than it is to uninstall or replace your swing check valve.

Here are the steps to install a swing check valve:

1. Check Valve Size Before you purchase your swing check valve, make sure that you know the size and style you need. Measure the pipes you will be attaching the valve to, and check the material. There are threaded valves, socket valves, and materials such as carbon steel, stainless steel, and PVC. You can see even more options here.
2. Look Inside the Valve Quickly taking a look inside the valve will ensure that nothing got stuck inside during shipping. If something small made its way into the swing check valve, it could potentially cause the flap to get stuck and prevent all water from flowing. This is a quick and easy step that could save you hours of time and frustration.
3. Check the Edges Whether you need a swing check valve with flanges or not, you should check the edges closely. Look for uneven edges, scratches, or anything else that could prevent your valve from sealing correctly.
4. Confirm Placement of Valve This is the only step that will change depending on the direction of your pipeline. Look on your valve for an arrow that indicates the direction of flow. If you are installing your swing check valve on a horizontal pipeline, place it in the appropriate direction.

If you are installing your swing check valve on a vertical pipeline, make sure the flow arrow is pointing up.

5. Attach Swing Check Valve onto Pipeline Finally, you can attach your swing check valve to your pipeline. Depending on the type of valve you’re using, you will either need to screw it with your hands or simply put the pieces together and make sure they’re secure.
6. Test the Valve You can test the functionality of your swing check valve by turning your water on and making sure it is flowing. If you use a clear PVC valve like this one, testing is easy because you can see how the valve is performing.

If during testing, you find that your water flow is blocked, you should double-check the direction of your swing check valve. If you notice leaking or any other problem, you can troubleshoot using the tips below.

Material of Stainless Steel Swing Check Valves

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What is a High Temperature Valve?

When choosing a valve design and material selection, the working temperature of the valve should be compatible with the valve body and trim materials. High-Temperature Valves are found in the petrochemical, chemical, fertilizer, electric power, and metallurgy industries. The material properties of non-ferrous, carbon steel, and alloy grades, are specified according to the limits of the material. Bronze, for example, cannot exceed 550F degrees, therefore not considered high temperature. High-temperature grades are:

Sub-high temperature

Sub-high temperature valves refer to the working temperature of the valve between 625f and 800f degrees.

WCB, WCC, A105, WC6, and WC9 are mainly used for corrosive services in this range: C5, CF8, CF3, CF8M, and CF3M is used

High-Temperature Level I

High-Temperature Level I is the working temperature of the valve within the range of 800f and 1025f degrees.

Materials within this range are based on CF8 Stainless steel in the ASTM A351 family.

High-Temperature Level II and Level III

High-Temperature Level II and Level III are within the working temperatures of the valve within the range of 1025f and 1350 degrees.

Materials within this range are based on CF8 Stainless steel in the ASTM A351 family.

For Temperatures above 1350f, the working temperature of the valve is classified as high-temperature Class IV and Class V. This requires application-specific recommendations and cannot be quoted routinely as the pressure-temperature level may cause plastic deformation.

Pressure /Temperature Matrix

Cast Steel or forged steel valves can be made of carbon steel or stainless steel alloys and trims are capable of handling 1000f degree temperatures at up to 10,000 psi. These valves are made with metal to metal full hard-faced seats, or various chrome-moly alloys and exotic materials like Monel 400, Hastelloy C276, Inconel 600, and Inconel 625.

How are valves specified for pressure-temperature?

ASME B16.34 Pressure Temperature Table groups materials by pressure and temperature for recommended application.

High Temperature Groups Materials

For example, Gate valves, globe valves, stop-check valves, and Check valves have recommended material combinations based upon the ASME B16.34 Pressure Temperature Table. SA 182 F11, SA 182 F22, SA 182 F316, ASTM A351 CF8M, A 351 CN7M, C-276, A217 WC6, A217 WC9, A216 WCB, A352 LCB, A352 LCC, A352 LC2, A352 LC3, A217 WC1, A217 WC4, A217 WC6, A217 WC9, A 217 C5 all carry different capabilities for pressure, temperature and corrosion resistance.

An additional factor determining valve limitations are packing and gasket materials, which can be made of Grafoil or Graphite for higher temperatures, Teflon for temperatures under 500F degrees, and high temperature two-ply and three-ply Monel bellows.

Features of High Temperature Check Valve

• For extremely high temperatures or cryogenic applications, valves may be equipped with high-temperature extensions.
• The packing is thus removed from the high- or low-temperature valve body.
• Valve body made of AISI 316Ti stainless steel.
• Two-piece stem with non-rotating lower stem increases service life of packing and seat.
• Large handle for easy operation at highest pressures. Minimum required torque and no backlash problems.
• Leakproof with gases and liquids.
• Inert PTFE or silver packing ring.
• Safety weep holes on tubing connections and packing.
• Connections for inch and metric SITEC HP tubing.
• Fluid working temperature –200°C (–300°F) to +300°C (570°F). With cooling jacket on the high-tem perature extension up to +450°C.
• All our valves are equipped with gland nuts and collars.
• All valves are factory tested and available short-dated.

Material of High Temperature Check Valve

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