FAQs of Water Purifier Filter Valve

1. What are the pressure loss parameters of the filter valve?

Pressure loss parameter

• General basic parameters: the pressure loss parameters of household water purifier filter valves are usually more stringent. Generally, in the initial state, under a standard flow rate of 10 L/min, the pressure drop value of a single filter valve is ≤ 0.08 MPa. As part of the filter valve for an ultrafiltration water purifier, the pressure loss is typically ≤ 0.02 MPa. In contrast, the filter valve for an RO water purifier must adapt to high-pressure conditions, with a typical pressure loss of ≤ 0.03 MPa. The pressure loss parameters of the filter valve in industrial water purifiers are relatively broad. For example, the filter valve pressure loss of an automatic water filter ranges from 0.01 to 0.03 MPa, while the pressure loss of a self-cleaning filter is ≤ 0.018 MPa.
• Special working condition parameters: parameters will be adjusted under some special conditions, such as backwashing, filter valve pressure drop peak value should be ≤0.2MPa, and recovery time should be ≤30 seconds; when the water temperature changes in 5 – 40°C, filter valve pressure drop change rate should be ≤0.01MPa/°C, to avoid water temperature affecting pressure stability. Additionally, after 100 hours of continuous operation of the filter valve, the pressure drop fluctuation range must be controlled within ±0.02 MPa to ensure long-term stability.

Impact on water output of the water purifier

• Directly affects water output: Pressure loss is negatively correlated with the water output of a water purifier. The greater the pressure loss, the greater the resistance to water flow, and the less water passes through the filter valve per unit time.
• After long-term use, the impact is exacerbated: the filter valve will be in continuous use, and the trapped impurities will gradually accumulate, causing the pressure loss to continue rising. When the pressure loss exceeds the tolerance range of the equipment, not only the water output will continue to decrease, but also impurities may be deposited in the valve body due to poor water flow, which will affect the filtration effect and even damage the core components such as membrane elements of the water purifier, forming a vicious circle and further reducing the water output. However, high-quality filter valves can reduce the impact by optimizing the flow area and other design elements. For example, Plumberstar’s ultrafiltration filter valve has a flow area 35% larger than that of its competitors and can effectively control flow attenuation to ≤5%.

2. What is the filtration accuracy and flow range of the purifier filter valve?

The filtration precision covers 5μm, 10μm, 20μm, 50μm and 100μm. It suits different water purification scenes. Conventional working flow rate: DN15 model 8-12L/min, DN20 model 15-20L/min, DN25 model 25-30L/min. The flow rate of competitors with the same specifications is generally 20%-30% lower. The working pressure is 0.1-1.0MPa. With the same filtration precision, the Plumberstar filter element has a 35% larger flow area than its competitors. The flow rate is more stable. The long-term use flow attenuation rate is ≤5%. Competitors generally ≥15%.

3. What is the sewage discharge method of the water purifier filter valve?

The valve uses a manual quick-open sewage design. A sewage outlet and sewage valve are built into the bottom of the valve body. By turning the sewage handle about 30°, sewage discharge starts. Some models also support automatic sewage with timing control. These are suitable for large commercial water purification systems. Compared with competing products, traditional filter valves usually need to be taken apart and cleaned. This process takes about 5–10 minutes. Plumberstar’s design improves sewage efficiency by more than 80%.

4. What is the difference between the ultrafiltration water purifier and the RO water purifier?

Ultrafiltration water purifier and RO water purifier filter valve selection core differences focus on filtration accuracy, flow adaptation, material requirements and sewage design, of which ultrafiltration water purifier adaptation filter valve to 10-20μm, flow rate should be ≥15L/min (DN15 model), priority is given to 304 stainless steel or food grade PPR material, connection mode is mostly fast plug, sewage cycle can be relaxed to once every 3 months, Because the ultrafiltration membrane has a large pore size (0.01-0.1μm), no fine filtration, no booster pump, low resistance design to ensure large flow direct drinking demand; RO RO reverse osmosis water purifier filter valve accuracy needs to reach 5-10μm, flow ≥8-12L/min (DN15 model) can be preferred 304/316L stainless steel material, connection method is mainly screw thread, it is recommended to match with high frequency manual or automatic sewage function (1-2 times per month) due to very small RO membrane pore size (0.0001μm), fine filtration is required to intercept fine impurities to avoid clogging of membrane holes, and RO machine has booster pump. Stainless steel valve body and pressure seal can guarantee stability under high-pressure conditions. Plumberstar has made targeted optimization for the filter valves of two kinds of water purifiers. The flow area of the ultrafiltration type is 35% larger than that of competitors. The flow attenuation is ≤5%. The filtration accuracy deviation of the RO type is ≤ ±1 μm, and a water hammer buffer structure is also incorporated. Adaptability and durability are improved by more than 40% compared to competitive universal designs.

5. What is the filtration efficiency and service life of the filter valve?

Filter efficiency ≥98%(for the corresponding precision impurities; filter life: conventional water quality (tap water) 6-12 months, poor water quality (well water/river water) 3-6 months; valve life ≥8 years, seals can be replaced in 3-5 years of everyday use, low maintenance cost.

6. What are the water purifier filter valve’s quality control links?

The Plumberstar water purifier filter valve undergoes eight strict quality control checks throughout the entire process before delivery. Each link is equipped with a standardized operating process (SOP) and automatic testing equipment, and a “unqualified product is stopped” mechanism is in place to ensure that the factory pass rate is ≥99.9%. The specific details and advantages compared with competitors are as follows:

• Raw Material Spectral Testing

All incoming raw materials are tested before production. These include valve body materials (304 / 316L stainless steel and food-grade PPR), filter elements (stainless steel sintered mesh or ceramic), and sealing parts (food-grade silicone). Each batch is checked with a direct-reading spectrometer.
For stainless steel, chromium (Cr) and nickel (Ni) content must meet the standard. For PPR, we confirm that no recycled material is used. For seals, heavy-metal migration is tested to meet safety limits.
All test data is recorded in the system and linked to the product batch number. Any material that fails is blocked before it enters production.

• Valve Body Dimensional Accuracy Test

Key dimensions are fully checked using a CNC image measuring system. This includes sealing surface flatness, thread accuracy, drain outlet diameter, and mounting hole spacing.
Sealing surface tolerance must be ≤0.02 mm. Thread accuracy must reach class 6H. Overall size deviation is limited to ±0.05 mm.
The system generates an automatic inspection report. Any part outside the limit is rejected directly.

• Filter Efficiency Test

The filter element is installed in a simulated water system. Water with standard impurity particles is passed through the filter. For example, a 10 μm filter is tested with 10 μm particles.
A laser particle analyzer measures impurity levels before and after filtration. Filtration efficiency must be ≥98%.
At the same time, flow resistance is checked. Ultrafiltration resistance must be ≤0.02 MPa, and RO resistance ≤0.03 MPa, so water flow is not affected.

• Sealing Performance Test

The valve body is connected to a pressure test bench. A working pressure of 0.8 MPa is applied and held for 30 minutes, which is higher than normal daily use.
Pressure sensors monitor pressure drop in real time. The drop must be ≤0.01 MPa, and no leakage is allowed.
Both forward and reverse flow sealing are tested to make sure the valve seals properly in all directions.

• Pressure Burst Test

The valve body is tested under extreme pressure. Conventional models are tested at 1.5 MPa, and hot-water models at 2.4 MPa.
Pressure is held for 5 minutes. The valve must show no cracking or deformation. This confirms structural strength under harsh conditions.

• Appearance Inspection

Each product goes through manual inspection and visual inspection by the equipment. We check for scratches, burrs, dents, rust spots, thread damage, and laser marking clarity.
Stainless steel surface roughness must be Ra ≤0.8 μm. PPR parts must have no bubbles or color differences.
Any defective product is reworked or scrapped.

• Sewage Discharge Function Test

The sewage handle is manually rotated 30° to open the discharge valve. Opening and closing must be smooth, with no sticking.
Sewage flow is measured, and internal impurities must be fully discharged within 1 minute.
For automatic discharge models, timing accuracy is also tested to ensure complete discharge and prevent filter blockage.

• Final Inspection and Packaging Check

All previous test results are reviewed together. Product model, batch number, and test records are checked one by one before packing.
Packaging is also inspected. PE bags, foam protection, manuals, certificates, and test reports must be complete.
Sample packages are drop-tested to simulate international transport. The allowed packaging damage rate is ≤0.1%, ensuring products arrive safely.

7. What is the competitive advantage of water purifier filters?

The core advantages are reflected in three points:

• High cost performance: The bulk purchase price is 10%-15% lower than that of the same industry, while the material and sealing performance are superior. (30% long sealing life)
• Flexible customization: support small batch customization, fast response speed (proofing within 3 days after drawing confirmation), and any requirements, just contact us.
• Perfect service: provides complete technical support, installation guidance, after-sales guarantee, B-end customer satisfaction ≥98%, repeat customers account for more than 70%, and has become a long-term supplier to a number of well-known water purifier brands.

8. How does the compact design benefit purifier manufacturers?

The compact valve design uses less primary material, such as stainless steel and brass, which are widely used in Plumberstar products. Because of this, raw material costs are lower.
This structure also improves material use during production. At the same time, the smaller size makes the valve easier to assemble on automated production lines. Assembly becomes faster and more stable. For water purifier manufacturers, this means lower component costs.
As water purifiers continue to evolve toward smaller and multifunctional designs, the compact filter valve helps conserve internal space. This makes it easier to place key parts like RO membranes, booster pumps, or water tanks inside one unit. It also supports various product forms, including countertop and wall-mounted models.
In addition, Plumberstar filter valves use a compact design with standardized interfaces. As a result, manufacturers can connect the valve to various pipelines and control systems without altering the internal structure of their products.
The small size and light weight also help during shipping. More units can be packed in one shipment, which lowers transport costs.
The valve structure is simple, so the failure rate stays low. Plumberstar also provides standard spare parts. This reduces after-sales maintenance work and helps manufacturers control service costs.

9. How many types of filter screens can you provide for the pre-filter?

There are many types of filter screens that we can provide from ＃40µm,＃100µm,＃150µm,＃200µm,＃250µm,＃300µm…. We can customize them in our factory and provide free samples within 3 working days.