Complete Guide for Top Entry, Swing Bolt & Screw Cap PPH Filter Systems

PPH bag filter housing is widely used in industrial liquid filtration systems due to its excellent corrosion resistance, lightweight structure, and long service life. Compared with traditional metal filter housings, PPH (Polypropylene Homopolymer) bag filter housing is especially suitable for strong acid, alkali, electroplating chemicals, industrial wastewater, and seawater treatment applications.

Proper installation and timely filter bag replacement are essential for maintaining filtration efficiency, reducing downtime, and extending the service life of the filtration system.

In this guide, we will explain how to install and replace different types of PPH bag filter housing, including:

· Top Entry PPH Bag Filter Housing

· Swing Bolt PPH Bag Filter Housing

· Screw Cap PPH Bag Filter Housing

What Is a PPH Bag Filter Housing?

PPH bag filter housing is a plastic filtration vessel manufactured from Polypropylene Homopolymer (PPH) material through injection molding technology. It is designed for liquid filtration applications where corrosion resistance and chemical compatibility are critical.

A standard PPH bag filter housing usually includes:

· Filter housing vessel

· Filter basket

· Filter bag

· Pressure gauge

· Exhaust valve

· Drain valve

· Sealing ring

The liquid enters the housing through the inlet, passes through the filter bag, and exits through the outlet after impurities are removed.

Related Reading

To learn more about PPH filtration systems, you can also read:

· Advantages of PPH Bag Filter Housing

· Industrial Applications of PPH Bag Filter Housing

Types of PPH Bag Filter Housing

1. Top Entry PPH Bag Filter Housing

Top entry PPH bag filter housing uses a top sealing structure that helps the filter bag fit tightly inside the basket.

Main Advantages

· Better sealing performance

· Reduced liquid bypass

· Higher pressure resistance

· More suitable for high precision filtration

· Stable continuous operation

2. Swing Bolt PPH Bag Filter Housing

Swing bolt PPH bag filter housing adopts a quick-opening swing bolt locking structure for easier maintenance.

Main Advantages

· Faster filter bag replacement

· Easy opening and closing

· Reduced maintenance downtime

· Suitable for medium and large flow systems

3. Screw Cap PPH Bag Filter Housing

Screw cap PPH bag filter housing uses a rotating cap sealing structure with a full plastic design.

Main Advantages

· Full plastic anti-corrosion structure

· No external metal components

· Excellent acid and alkali resistance

· Compact and economical design

Comparison of Different PPH Bag Filter Housing Structures

How to Choose the Right Filter Bag

Before installing a PPH bag filter housing, it is important to choose the correct filter bag.

Filter Bag Size

Common filter bag sizes include:

· Size #1

· Size #2

· Custom sizes

Micron Rating

Typical filtration precision includes:

· 1 micron

· 5 micron

· 10 micron

· 25 micron

· 50 micron

· 100 micron

Filter Bag Material

Different liquids require different filter bag materials:

· PP filter bags

· PE filter bags

· Nylon filter bags

· PTFE filter bags

Pre-Installation Checklist for PPH Bag Filter Housing

Before installation, always check the following:

Housing Components

· Housing body

· Filter basket

· Sealing ring

· Pressure gauge

· Exhaust valve

· Drain valve

Pipeline Connection

· Correct inlet and outlet direction

· Proper flange sealing

· Stable pipeline support

Safety Preparation

· Shut down the system

· Release internal pressure

· Wear protective equipment

How to Install Swing Bolt PPH Bag Filter Housing

Step 1 – Check Housing and Accessories

Inspect the housing body, swing bolts, and sealing components.

Step 2 – Connect the Pipeline System

Install inlet and outlet pipelines correctly.

Step 3 – Install Basket and Filter Bag

Place the basket into the housing and install the filter bag properly.

Step 4 – Tighten Swing Bolts

Close the top cover and tighten the swing bolts evenly.

Step 5 – Start the Filtration System

Vent air from the housing and gradually start the system.

How to Replace Filter Bag in Swing Bolt PPH Housing

1. Shut down the filtration system

2. Open the exhaust valve

3. Release internal pressure

4. Open the swing bolt cover

5. Remove the used filter bag

6. Install a new filter bag

7. Reassemble and restart the system

How to Install Screw Cap PPH Bag Filter Housing

Step 1 – Check the Housing

Ensure the screw cap and housing body are not damaged.

Step 2 – Install Drain Valve and Gauge

Install all accessories properly.

Step 3 – Connect Pipelines

Connect the inlet and outlet pipelines securely.

Step 4 – Install Basket and Filter Bag

Install the basket first, then place the filter bag into the basket.

Step 5 – Tighten the Screw Cap

Rotate the screw cap clockwise to seal the housing.

Step 6 – Start the Filtration System

Slowly fill the housing with liquid and release trapped air before operation.

How to Replace Filter Bag in Screw Cap PPH Housing

1. Stop the system

2. Release internal pressure

3. Unscrew the top cap

4. Remove the used filter bag

5. Clean internal components

6. Install a new filter bag

7. Tighten the cap and restart the system

How to Install Top Entry PPH Bag Filter Housing

Step 1 – Inspect the Housing

Check whether the housing and accessories are damaged during transportation.

Step 2 – Install Valves and Pressure Gauge

Install the exhaust valve, drain valve, and pressure gauge correctly.

Step 3 – Connect the Pipeline

Connect the inlet and outlet flanges to the pipeline system and ensure proper sealing.

Step 4 – Clean Internal Components

Clean the housing, basket, and sealing surfaces before installation.

Step 5 – Install Basket and Filter Bag

Place the basket into the housing and install the filter bag vertically.

Step 6 – Seal the Top Cover

Close and tighten the top cover properly to ensure good sealing performance.

Step 7 – Start the System

Slowly open the inlet valve, release trapped air through the exhaust valve, and then fully start the filtration system.

How to Replace Filter Bag in Top Entry PPH Housing

1. Stop the filtration system

2. Release internal pressure

3. Open the top cover

4. Remove the used filter bag

5. Clean the basket and housing

6. Install a new filter bag

7. Restart and test the system

Common Installation Mistakes

Incorrect installation may reduce filtration efficiency or damage the system.

Common Problems Include:

· Incorrect inlet and outlet direction

· Failure to release pressure before opening

· Improper filter bag installation

· Damaged sealing ring

· Over-tightening the cover

· Ignoring pressure difference monitoring

Troubleshooting PPH Bag Filter Housing

When Should You Replace the Filter Bag?

The filter bag should be replaced when:

· Differential pressure increases significantly

· Liquid flow rate decreases

· Filtration efficiency drops

· Visible contamination appears

· Production quality becomes unstable

Timely replacement helps maintain stable filtration performance and protects downstream equipment.

Maintenance Tips for PPH Bag Filter Housing

To extend the service life of the filtration system:

· Clean the basket regularly

· Inspect sealing components

· Monitor pressure difference

· Replace damaged parts in time

· Verify chemical compatibility

Proper maintenance reduces downtime and improves filtration efficiency.

Safety Precautions During Installation and Replacement

Always follow proper safety procedures during operation.

Important Safety Measures

· Release internal pressure before opening the housing

· Wear gloves and protective equipment

· Avoid chemical splashing

· Handle corrosive liquids carefully

Safety operation is especially important in chemical and wastewater treatment systems.

FAQ

What is the difference between PP and PPH filter housing?

PPH has better chemical resistance, temperature resistance, and mechanical strength compared with standard PP material.

Which PPH bag filter housing structure should I choose?

· Top Entry: High precision and higher pressure systems

· Swing Bolt: Frequent maintenance applications

· Screw Cap: Strong acid and alkali filtration

Why is screw cap structure suitable for corrosive liquids?

Because it adopts a full plastic structure without external metal locking components, reducing metal corrosion risks.

How often should filter bags be replaced?

It depends on liquid contamination level, flow rate, and pressure difference. Most systems replace filter bags when differential pressure rises significantly.

Conclusion

Different PPH bag filter housing structures are suitable for different industrial filtration applications.

· Top Entry structures provide better sealing and higher pressure resistance

· Swing Bolt structures simplify maintenance and filter bag replacement

· Screw Cap structures offer excellent anti-corrosion performance with full plastic construction

Correct installation, regular maintenance, and timely filter bag replacement are essential for maintaining efficient and stable filtration performance.

If you need help selecting the right PPH bag filter housing or filter bag solution, feel free to contact us for technical support and customized industrial filtration solutions.