Wafer check valves are compact and easy to install. They operate based on the pressure differential generated by the flow of the medium. When the medium flows in the forward direction, the valve disc automatically opens; when the medium flows in the reverse direction, the valve disc quickly closes to prevent backflow. Wafer check valves offer low flow resistance and rapid opening and closing, making them suitable for a variety of media, such as water, steam, and air. They are widely used in water supply and drainage, chemical, and petroleum industries, ensuring safe and stable system operation.
Wafer Check Valve Installation Location
To effectively install a wafer check valve, you must first understand its installation location. It uses a wafer connection, directly installing between two flanges without the need for additional fittings, effectively saving space and installation costs. The installation location of a wafer check valve should be determined based on the type, piping layout, and maintenance requirements. All wafer check valves can be installed in horizontal pipes. Only double-flap wafer check valves or models marked “Vertical Only” are suitable for vertical pipes. It is important to note that single-flap check valves (long and short series) can only be used in horizontal pipes.
During installation, pay attention to space requirements. Do not install pipe joints, obstructions, or reducers within the operating radius of the valve disc. Allow ample space around elbows, and leave a straight pipe section at least six times the valve diameter at the pump outlet.
Notes
Single-flap valves should not be installed in vertical pipes: Due to structural limitations, single-flap wafer valves (long and short series) have poor sealing performance in vertical pipes.
Avoid direct series connection: Do not connect directly with other valves such as butterfly valves; isolation is required via expansion tubes.
The valve’s flow direction marking must align with the media flow direction to ensure proper check function.
Wafer Check Valve Installation Tutorial
After fully understanding the precautions for wafer check valve installation, wafer check valve installation becomes straightforward. The following is a wafer check valve installation tutorial.
Confirming the valve’s flow direction: Before installation, check the flow direction marking on the valve to ensure it aligns with the pipe flow direction. This is essential for proper valve operation.
Prepare tools and materials: Prepare installation tools such as wrenches, screwdrivers, and pipe wrenches, as well as sealing materials such as gaskets or sealant.
Clean pipes and valves: Ensure the pipes are free of debris and the valve connection surfaces are clean to ensure a good seal and prevent leaks.
Inspect the valve: Use your fingers to push the valve disc in the opening and closing direction to ensure the valve opens and closes properly and that the sealing surfaces are free of debris and damage.
Align the valve and pipe: Place the valve between the two flanges, aligning the valve and pipe bolt holes. This is crucial for a good seal.
Install bolts and washers: Insert the bolts into the connection holes, place washers on both sides, and tighten gradually to ensure even force and prevent leaks.
Tighten bolts gradually: Tighten in a diagonal pattern to prevent deformation of the valve due to uneven force and ensure proper sealing.
Check for leaks: After installation, test the connection by filling it with water or air. If leaks are detected, adjust or replace the gasket immediately.
Ensure there are no external forces affecting the valve: After installation, allow the pipes and valves to rest in a natural position to prevent deformation or damage from external forces.
Wafer Check Valve Daily Maintenance
Daily Inspections
Sealing: Check the valve body joints and disc sealing surface quarterly to confirm there are no leaks or wear. In highly corrosive environments, this inspection should be reduced to monthly.
Actuation Flexibility: Manually or by simulating media flow, observe whether the disc opens and closes smoothly and whether there is any sticking or unusual noise.
Fastener Condition: Check the clamp bolts, pins, etc. for looseness. If found, re-tighten them to the required torque.
Key Cleaning Points
Valve Cavity Cleaning: Remove the valve cover every six months to remove any deposits, welding slag, or crystallized media from the disc, seat, and flow path to prevent scratching of the sealing surface.
External Cleaning: Keep the outer surface of the valve body free of dirt and oil to prevent the accumulation of corrosive fluids.
Regular Maintenance Item
Lubrication and Spare Parts: Grease the disc shaft, pin, and other rotating parts every six months (use high-temperature grease for high-temperature conditions). Keep a stockpile of readily wearable parts, such as seals and discs, for immediate replacement if damaged.
In addition, before any disassembly or replacement, always shut off the upstream media and relieve pressure to ensure safety. Maintain a maintenance log to record every inspection, replacement, and any issues found to facilitate tracking valve health trends.
Newton‘s Wafer Check Valve MH71H-25P seat and disc undergo heat treatment and aging, achieving micron-level precision and zero leakage when closed. It is suitable for steam pipelines, non-corrosive gases, liquids, and other media. Please feel free to contact us if you have any questions.
