How to Select the Appropriate Grease Injector for Single-Line Lubrication Systems

Introduction

In a single-line lubrication system, the grease injector is a core component that determines lubrication precision, bearing service life and system reliability.

Selecting the right grease injector is not just about matching thread sizes, but requires a comprehensive evaluation of the following factors:

1、Lubricant requirement for each lubrication point

2、System operating pressure

3、Ambient temperature conditions

4、Load on the lubricated part

5、Pipeline distance from the pump to the grease injector

6、Industry application scenarios

This guide will systematically explain how to select a grease injector correctly and provide a professional comparative analysis of the CISOLUBE VL series models.

What is a Grease Injector in a Single-Line Lubrication System?

In a single-line lubrication system: the lubrication pump pressurizes the main oil line; each grease injector delivers a fixed quantity of grease according to the set displacement; the grease injector resets automatically after the system is depressurized, waiting for the next lubrication cycle. Unlike progressive lubrication systems, each grease injector in a single-line system operates independently, making model selection crucial.

Step 1: Determine the Grease Displacement Required for Each Lubrication Point

This is the most critical factor in selection.

The lubricant requirements vary significantly for different equipment components:

Application Type Recommended Displacement Range

Precision machinery： 0.02 – 0.13 ml

Standard bearings： 0.13 – 1.3 ml

Heavy-duty pin shafts： 0.5 – 5 ml

Large rotating equipment： 1 – 8 ml

Recommended VL Series Models:

1、Micro-lubrication → VL-32 Grease Injector

2、Standard industrial applications → VL-1

3、Moderate lubrication requirements → VL-1X

4、Heavy-duty bearings → VL-1XL

5、Large single-point lubrication → VL-11

Step 2: Confirm the System Operating Pressure

Single-line lubrication systems typically operate at 100 – 300 bar.

For systems with high-pressure requirements such as long-distance pipelines or mining equipment:Recommendation: VL-1XL (maximum 414 bar)

Standard engineering machinery: VL-1 / VL-1X

Low-pressure precision systems: VL-32

Insufficient pressure rating in selection may result in incomplete grease discharge.

Step 3: Consider the Ambient Temperature

Ambient temperature affects grease fluidity and the service life of seals.

Model Temperature Range

VL-1： -26°C to +176°C

VL-11 ：-40°C to +93°C

VL-1X / VL-1XL ：Max. 82°C

VL-32： Max. 93°C

Cold mining environments: VL-11 is recommended

High-temperature industrial environments: VL-1 is recommended

Step 4: Evaluate the Number of Lubrication Points

The VL series grease injectors are available in a variety of combination forms:

1 outlet

2 outlets

3 outlets

4 outlets5 outlets6 outlets

Centralized systems with multiple lubrication points: Select multi-outlet combinations of VL-1 / VL-1X / VL-32

Single large lubrication point: Select VL-11

Step 5: Match the Industry Application

Different industrial sectors have distinct requirements for grease injectors:

1、Mining equipment, high pressure, large displacement: VL-1XL / VL-11

2、Engineering machinery, medium pressure, adjustable displacement: VL-1 / VL-1X

3、Steel & cement industry, high-temperature environment, heavy-duty bearings: VL-1 / VL-1XL

4、Automation & machine tools, precision micro-lubrication: VL-32

Comparative Analysis of VL Series Grease Injector Models

Model	Displacement Range	Maximum Pressure	Applicable Scenarios
VL-32	24 MPa	0.016–0.131 ml/cyc	Micro and precision lubrication
VL-1	241 bar	0.131–1.31 ml/cyc	Standard industrial applications
VL-1X	441 bar	0.25–1.31 ml /cyc	Moderate lubrication requirements
VL-1XL	441 bar	0.57–5.00 ml /cyc	Heavy-duty applications
VL-11	241 bar	0.82–8.2 ml/cyc	Large single-point lubrication

Common Selection Mistakes

1、Selecting models solely based on thread sizes

2、Ignoring pressure loss in long pipelines

3、Using large-displacement models for small bearings

4、Neglecting ambient temperature limits

5、Mixing different displacements without conducting system calculations

Why Choose CISOLUBE VL Series Grease Injectors?

1、Precisely adjustable displacement, available in carbon steel and stainless steel.

2、High-pressure capacity of up to 414 bar

3、Visual operation indicator

4、Modular combined structure

5、Easy maintenance and replacement

6、Suitable for NLGI Grade 0, 1 and 2 grease

Applicable to mining, engineering machinery, steel, cement, wind power, oil and gas and other industries

CISOLUBE provides a complete single-line lubrication system solution, including lubrication pumps, grease injectors, control systems, pipelines and fittings. These solutions are part of an automatic centralized lubrication system, ensuring efficient lubrication and reduced maintenance requirements.