When installing sanitary diaphragm valves, special attention should be paid to their high cleanliness and sealing requirements to ensure that the valve can operate normally and meet hygiene standards. The following are key issues that need to be paid attention to during installation:
1. Preparation before installation
(1) Check the valve
Appearance inspection: Confirm that the valve appearance is not damaged, and the diaphragm and seals are intact.
Model verification: Check whether the valve model and specifications meet the design requirements.
Cleaning the valve: Use a clean cloth or alcohol to wipe the inner and outer surfaces of the valve to ensure that there are no dust, oil or other pollutants.
(2) Check the pipeline
Cleaning the pipeline: Ensure that there are no impurities, welding slag, oil, etc. in the pipeline, and flush or blow it if necessary.
Pipeline alignment: Check whether the pipeline flange or interface is aligned to avoid stress during installation.
(3) Prepare tools
Prepare the tools required for installation, such as wrenches, screwdrivers, levels, etc.
Ensure that the installation environment is clean and tidy to prevent dust or foreign matter from entering the valve or pipeline.
3. Installation steps
(1) Determine the flow direction
According to the flow direction mark on the valve (usually marked as "Flow Direction" or arrow), ensure that the valve is installed in the correct direction.
Diaphragm valves are generally designed for one-way flow. Reverse installation may cause the valve to fail to close normally or seal failure.
(2) Connect the pipeline
Flange: Align the valve flange with the pipeline flange and ensure that the gasket (such as PTFE gasket) is placed correctly. Tighten the bolts evenly to avoid flange deformation or leakage caused by unilateral force.
Quick clamp: Align the valve with the pipeline and fix it with a clamp to ensure that the connection is well sealed.
Thread: Wrap sealing tape or apply sealant on the thread to ensure sealing. Avoid excessive force when tightening to prevent thread damage.
(3) Fix the valve
Fix the valve in a suitable position and ensure that the operating handle or actuator is easy to operate.
Use a bracket or support device to fix the valve to avoid deformation of the valve due to pipeline vibration or gravity.
4. Post-installation inspection
(1) Sealing test
After the medium is introduced, check whether the valve and the joints are leaking.
Use soapy water or a leak detector to check the sealing and deal with any problems in a timely manner.
(2) Operation test
Manually or automatically operate the valve to ensure that it is flexible and free of jamming.
Check whether the diaphragm moves smoothly and ensure that the valve can be fully opened and closed.
4. Precautions
(1) Avoid contamination
During the installation process, ensure that there is no dust, oil or other contaminants inside the valve and pipe.
Use clean tools and gloves for operation.
(2) Avoid over-tightening
When connecting flanges, the bolts should be tightened evenly to avoid unilateral force causing flange deformation or seal failure.
When connecting threads, avoid over-tightening to cause thread damage.
(3) Avoid mechanical damage
Avoid knocking or colliding with the valve during installation to prevent damage to the diaphragm or seal.
Use appropriate tools and avoid using sharp tools to scratch the valve surface.
(4) Environmental requirements
The installation environment should be kept clean to avoid dust, moisture, etc. that may affect valve performance.
For sterile environments, valves and pipes should be disinfected before installation.
5. Maintenance recommendations
Regular inspection: Regularly check the valve sealing and operational flexibility after installation, and deal with problems in a timely manner.
Cleaning and disinfection: Regularly perform CIP (cleaning in place) and SIP (sterilization in place) to ensure the hygienic performance of the valve.
Replacement of wearing parts: Diaphragms and seals are wearing parts, and it is recommended to replace them regularly according to usage.