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WENK Pneumatic LR Series Filter Regulator

The Festo LR series pressure regulator is a high-performance pneumatic component designed to maintain stable output pressure regardless of input pressure fluctuations. Available in Mini, Midi, and Maxi sizes with G1/4 to G1 connections, it offers pressure regulation ranges of 0.5-7 bar or 0.5-12 bar, and standard flow rates up to 12500 l/min.

Featuring a direct-acting diaphragm design with secondary venting, it ensures precise pressure control with minimal hysteresis (0.2-0.4 bar). The robust metal construction with NBR seals provides durability in industrial environments (-10°C to 60°C).

Optional locking handles prevent unauthorized adjustments, making it suitable for automated production lines, packaging machinery, and process control systems.

product Details

product description

Product Detail

Model	Mini			Midi				Maxi
Port Size	G1/8	G1/4	G3/8	G1/4	G3/8	G1/2	G3/4	G1/2	G3/4	G1
Structural Features	Direct-Operated Diaphragm Pressure Regulator							Pilot-Operated Piston
								Direct-Operated
Operating Media	Filtered Compressed Air，Filtration Grade: 40μm
Input Pressure	1 bar~16 bar
Maximum Hysteresis	0.2 bar							0.4 bar
Adjustment Range	0.5 bar~7 bar / 0.5 bar~12 bar
Material	Aluminum Alloy / Zinc Alloy

Festo LR Series Pressure Regulator - User Guide

Product Overview

The Festo LR series pressure regulator is a high-end Festo-type air preparation unit featuring a direct-acting diaphragm design. It provides precise and stable pressure control for pneumatic systems. Through main pressure compensation, it maintains constant output pressure despite fluctuations in input pressure, ensuring stable operation of pneumatic components.

Technical Parameters:

Type: Direct-acting diaphragm pressure regulator
Operating pressure: 1-16 bar
Pressure regulation range: 0.5-7 bar or 0.5-12 bar
Flow range: 120-12500 l/min
Operating temperature: -10-60°C
Maximum pressure hysteresis: 0.2-0.4 bar
Connection size: G1/8 to G1
Design features: With secondary venting, metal housing, NBR seals
Mounting: Pipe mounting or panel mounting
Features: Precise pressure control, main pressure compensation, secondary venting, optional locking device, multiple sizes available

Installation Steps

1. Pre-installation Preparation

Ensure the compressed air system is shut off and depressurized
Clean connecting pipes to remove foreign objects and impurities
Prepare necessary tools: wrench, PTFE tape, etc.
Inspect the pressure regulator for damage and confirm the model meets system requirements

2. Installation Position and Sequence

Installation sequence: In a pneumatic system, the pressure regulator should be installed after the filter
Installation position: Should be installed in a horizontal or vertical position, avoiding inclined installation
Installation direction: Must be installed according to the airflow direction marked on the valve body

3. Pipe Connection

Use PTFE tape for thread sealing (note: do not allow PTFE tape to enter the pipe interior)
Tighten connections evenly with a wrench, avoiding excessive force that may damage threads
Ensure all connections are secure and tight without leakage

4. Mounting Installation

Pipe mounting: Directly fixed through pipe connections
Panel mounting:
1. Drill a 36.5mm diameter mounting hole in the panel
2. Insert the pressure regulator into the mounting hole
3. Secure with the dedicated fixing nut from the back of the panel
4. Ensure secure installation without looseness

5. Pressure Gauge Installation (Optional)

Install pressure gauge using G1/8 connection
Ensure the pressure gauge is securely installed and the reading is clearly visible
The pressure gauge range should match the regulator's pressure regulation range

6. Post-installation Check

Ensure all connections are secure without looseness
Confirm airflow direction matches the arrow indication
Check if the installation position meets requirements
Verify that the locking device (if equipped) functions properly

Operation Guide

1. Initial Pressure Setting

Pressure adjustment method:
1. Rotate the adjustment knob counterclockwise to the minimum pressure position
2. Slowly open the air supply and observe the pressure gauge reading
3. Rotate the adjustment knob clockwise to adjust the pressure to the desired value
4. After adjustment, if equipped with a locking device, lock the current setting
Precautions:
- Adjust slowly to avoid sudden pressure increases
- The set pressure should not exceed the system requirements
- The set pressure should not exceed the regulator's maximum adjustment range

2. Pressure Adjustment Operation

Increase pressure: Rotate the adjustment knob clockwise
Decrease pressure: Rotate the adjustment knob counterclockwise
Pressure locking: If equipped with a locking device, press or rotate the locking mechanism after adjustment

3. Operation Check

After starting the system, observe the operation of the pressure regulator
Check if the output pressure is stable at the set value
Inspect all connections for leaks
Confirm the secondary venting function is normal (gas should be exhausted when reducing pressure)

Maintenance

1. Daily Inspection

Regularly check if the output pressure is stable
Verify if the pressure gauge reading is accurate
Inspect all connections for leaks
Keep the valve body clean, avoiding dust and debris accumulation

2. Periodic Maintenance

Cleaning and maintenance:
1. Shut off the air supply and release system pressure
2. Disassemble the pressure regulator (if necessary)
3. Clean the exterior of the valve body with compressed air
4. Inspect the condition of diaphragms and seals
5. Reinstall and test
Maintenance cycle:
- Daily inspection: Once a week
- Cleaning maintenance: Once every 3 months
- Seal replacement: Once every 12 months or as needed
- Comprehensive inspection: Once every 12 months

3. Troubleshooting

Unstable output pressure:
1. Check if the input pressure is stable
2. Inspect if the diaphragm is damaged
3. Check if the valve seat has impurities
4. Inspect if the adjustment spring is fatigued
Unable to reach set pressure:
1. Check if the input pressure is sufficient
2. Verify if the adjustment range matches requirements
3. Check if the valve port is blocked
4. Inspect if the diaphragm is damaged
Pressure leakage:
1. Check if connections are tight
2. Inspect if seals are damaged
3. Check if the valve body has cracks
4. Inspect if the pressure gauge interface is leaking

Precautions

1. Safety Precautions

Always shut off the air supply and release pressure before installation and maintenance
Do not exceed the maximum working pressure of 16 bar
Avoid use in high-temperature environments (temperature not exceeding 60°C)
Do not strike or scratch the valve body with sharp objects

2. Usage Limitations

For compressed air systems only
Not suitable for corrosive gas environments
Avoid direct sunlight and strong vibration
Not for use with oxygen or other flammable and explosive gases

3. Repair and Replacement

Use original accessories for maintenance
Follow product manual guidelines for seal replacement
If valve body damage is found, immediately stop use and replace
Conduct pressure testing after maintenance to ensure safety

Frequently Asked Questions

Q1: Where should the pressure regulator be installed in a pneumatic system?
A1: The pressure regulator should be installed after the filter, near the pneumatic components requiring stable pressure.

Q2: How to determine if the pressure regulator is working properly?
A2: After starting the system, observe if the pressure gauge reading remains stable at the set value and if the pressure adjustment responds sensitively.

Q3: Can the pressure regulator be adjusted while the system is running?
A3: Yes, the LR series pressure regulator is designed to allow pressure adjustment during system operation.

Q4: What is the recommended maintenance cycle?
A4: Daily inspection once a week, cleaning maintenance once every 3 months, and seal replacement once every 12 months.

Q5: What may cause unstable output pressure of the regulator?
A5: Possible causes include: input pressure fluctuations, damaged diaphragm, impurities on the valve seat, or fatigued adjustment spring.

Our Commitments & Core Advantages

1. We are a factory specializing in the production of pneumatic components, with mature manufacturing experience and technology.

2. We manufacture and supply a wide range of series and specifications of air cylinders and pneumatic components, providing you with flexible options.

3. We can undertake the customization business of various pneumatic components according to the specific needs of customers.

We adhere to the service concept of efficiency and thoughtfulness, making you feel comfortable throughout the cooperation process, just as smooth as cooperating with a close friend.

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