On January 16, 2025, Shijiazhuang Amanda Import and Export Trading Co., Ltd. organized a knowledge training session on Flow Restrictors. The training was led by the company's technical engineer, Ares. The purpose of this session was to enhance employees' in-depth understanding of the company's product-related technologies, enabling them to better serve clients.

What is the Flow Restrictor?

The Flow Restrictor of a water purifier refers to the ratio of the volume of wastewater generated to the volume of purified water produced during the filtration process.

For example, a Flow Restrictor ratio of 2:1 means that for every 2 parts of purified water produced, 1 part of wastewater is generated. This ratio reflects the water resource utilization efficiency of the purifier. The smaller the ratio, the less wastewater is produced for the same amount of purified water, indicating higher water resource efficiency.

1. Application Range

Used for controlling the concentrate flow rate and stabilizing the membrane pressure in reverse osmosis systems for water treatment equipment.

FR-A1-Q2 is suitable for membranes with a capacity of 50-150G.

FR-A2-Q2 is suitable for membranes with a capacity of 150-600G.

2. Product Features

When the inlet pressure rises to a certain value, the stainless steel needle automatically inserts into the throttling hole, forming a small flow throttling.

When the pressure drops to a certain value, the stainless steel needle automatically exits the throttling hole, allowing a water flow greater than the nominal throttling flow to automatically clean the throttling channel, preventing blockages caused by impurities such as activated carbon powder, crystals, and colloids.

The flow rate can be continuously adjusted by adjusting the length of the throttling channel.

3. Technical Parameters

Material: POM

Dimensions: 25.5 (max diameter) * 88 (length) mm

Applicable water temperature: 5-45°C

Calibration pressure: 0.49 MPa (70 PSI)

Flow rate adjustment range: 2 specifications

A1: 100-720 ml/min

A2: 900-2300 ml/min

Flow deviation corresponding to the scale: ≤20% (slightly larger deviation at the start and end of flow)

Burst pressure: >3.5 MPa

4. Usage Instructions

Rotate the water inlet end to the desired angle relative to the housing, aligning the triangular arrow on the outer circumference of the inlet with the scale line on the scale sticker. The indicated position corresponds to the actual flow rate (maximum rotation angle: 335°).

5. Applicable Environment

Ambient temperature: 5-50°C

Ambient humidity: <95%

Storage temperature: -20-80°C

6. Appearance Image

7. Flow Rate Curve and Precautions

This product is suitable for intermittent operation. The continuous working time should not exceed 1 hour. Before restarting, ensure that the inlet pressure is reduced to no more than 0.03 MPa since the previous shutdown.

8. Flow Restrictor Selection

For households with more people and larger water consumption, it is recommended to choose a purifier with a wastewater ratio of 2:1 or above, as it can meet the daily drinking, cooking, and washing needs while being more water-efficient.

The higher the wastewater ratio, the shorter the filter lifespan may be, and the higher the replacement cost. From a long-term usage cost perspective, a 2:1 wastewater ratio is more suitable. It ensures a good balance between water savings and filter replacement frequency, avoiding excessive costs.

2:1 wastewater ratio: Meets the national first-class water efficiency standards, has a higher water output rate, effectively saves water resources, and does not excessively affect the filter's lifespan. It is the most cost-effective option. Suitable for most households, balancing water savings and filter replacement costs effectively.

After explaining the theoretical knowledge of how to use the wastewater ratio parameter, the employees picked up the wastewater ratio samples to carefully observe its appearance and structure, and at the same time, they made adjustments under the guidance of Ares. Everyone actively communicated and shared their findings and doubts.