FAQs of PPR Double Union Ball Valve

1. What is the structure of the PPR double union ball valve?

From Mako Products – Superlok TV

Core Structural Design
The valve features a PPR hot-melt welding interface, combined with a brass or stainless steel valve body, PTFE seats, and a precision ball core, specifically engineered for PPR piping systems.
Key Differentiation
Unlike conventional valves that require additional adapters or transition fittings, the PPR interface can be directly fused to PPR pipes, eliminating extra connection points.
Integrated PPR Interface Technology
Plumberstar adopts an integrated injection-molded PPR interface, ensuring:
Uniform wall thickness ≥ 3 mm,
Consistent material density,
Reduced internal stress during hot-melt welding.
This design effectively prevents cracking, deformation, and leakage during installation and long-term operation, delivering higher reliability compared with assembled or bonded PPR interfaces.

2. What are the options for PPR double union ball valve body and core materials?

The valve body can be selected from brass or 304 stainless steel, and the ball core is brass nickel plating or 316 stainless steel; brass has high cost performance and is suitable for neutral water medium; stainless steel has stronger corrosion resistance and is suitable for acid and alkali water quality or commercial scenes; all metal materials of Plumberstar pass salt spray test ≥480 hours.

3. What are the key steps in the PPR double union ball valve process?

Core valve technology: 1 PPR interface injection molding (tolerance ≤±0.1mm). 2 valve body CNC precision machining. 3 Ball core and valve seat grinding pairing. 4. 100% water pressure test (1.5 times rated pressure for 30 minutes). 5. Finished product appearance full inspection. Plumberstar is equipped with an imported injection molding machine and testing equipment, with each process featuring a quality inspection node, resulting in a pass rate of 99.8%.

4. What is the PPR interface weld strength specific test data of the ball valve?

After a hot melt connection with a tensile strength of ≥ 1.2 MPa, the interface remains intact after 1000 cycles of cold and hot temperature tests (-10℃ to 70℃), showing no signs of separation or leakage. According to the GB/T 18742.3-2017 standard test, the weld fracture occurs in the pipe body, not the interface, to ensure the reliability of the connection.

5. What specifications of PPR pipes does the PPR double union ball valve fit?

Suitable for PPR pipe specifications of 20mm, 25mm, 32mm, 40mm (corresponding to 1/2″, 3/4″, 1″, 1.25″); connection method for hot melt welding (temperature 260℃±10℃), suitable for mainstream PPR pipe brands on the market. Plumberstar can provide a hot-melt temperature and time reference table.

6. Can customization be provided for the PPR double union ball valve?

Yes, we support any diameter customization specification (such as 20 mm × 25 mm or 25 mm × 32 mm). The smooth transition design of the internal flow channel reduces water flow resistance. When customizing, it is necessary to specify the interface specifications and pipe types at both ends. Plumberstar can issue 3D drawings for confirmation, with a cycle of 10-15 working days. Any requirements, just contact us.

7.  What quality tests are performed on each batch of PPR double union ball valve?

Dual Quality Control System: 100% Inspection + Statistical Sampling

Plumberstar implements a “full inspection + sampling inspection” dual-detection mechanism to ensure consistent product quality. Core inspection items and practical execution are as follows:

1. PPR Welding Interface Inspection
   Wall Thickness Control:
   Measured with a wall thickness micrometer, with deviation controlled within ±0.1 mm.
   Inner Diameter Verification:
   Checked using GO/NO-GO gauges to ensure full compatibility with standard PPR pipelines and reliable fusion welding.
2. Hydraulic Pressure Test
   Each valve is tested individually using an automatic pressure testing machine.
   The system records the real-time pressure curve for every unit.
   Any unqualified product is automatically identified, isolated, and removed from the production flow.
3. Sealing Performance Test
   Valves are fully immersed in water and pressurized to 1.2 times the rated working pressure.
   The holding time is 3 minutes, during which the valve is inspected to ensure no bubble leakage occurs.
4. Appearance & Surface Quality Inspection
   Sampling is conducted according to AQL 1.0 standards.
   Surface Color Consistency:
   Tested with a colorimeter, with color difference controlled within ΔE ≤ 1.5.
   Surface Hardness:
   Verified using a scratch hardness tester, meeting ≥ HB200 requirements.
5. Quality Documentation & Third-Party Verification
   A Factory Inspection Report (COA) is issued for each batch, including:
   Detailed test data
   Operator identification
   Testing equipment numbers
   Supports re-inspection by customer-designated third-party inspection bodies.
   Plumberstar fully cooperates by providing test samples, inspection procedures, and on-site or remote technical support.

8. How to verify the authenticity of PPR double union ball valve materials?

Triple Validation System for Quality Assurance

Plumberstar offers a three-level verification mechanism to ensure the authenticity of materials, compliance with production standards, and full traceability for valve products.

1) Material Test Certificate (MTC)
Each batch is supplied with a complete Material Test Certificate (MTC), including:
Qualification details of the raw material supplier, Heat (furnace) number for full traceability, Original chemical composition test data, Material sourcing traceable to recognized steel producers such as Baosteel, CNPC, or equivalent qualified suppliers. This ensures full compliance with international material traceability requirements.

2) On-Site Material Verification Support

Customers are welcome to conduct on-site random inspections at the Plumberstar factory using their own portable spectrometers (e.g., SPECTROPORT). Random sampling is performed on finished products. The metal composition of the valve body can be tested directly on site. Plumberstar provides designated testing locations to avoid damage to functional areas: Sampling is taken from the side wall of the valve body. Sealing surfaces and pressure-bearing areas are excluded. This enables immediate and transparent verification of material consistency.

3) Third-Party Inspection (SGS / BV)

For batch orders, Plumberstar supports jointly commissioned third-party inspections, such as SGS or BV, with inspection scope including but not limited to: Metal material composition analysis – ASTM E1019PPR, thermal stability testing – ISO 10837, Seal temperature resistance testing – GB/T 1690Inspection cost responsibility: If test results show any material non-conformity, Plumberstar bears the full inspection cost. The third-party inspection report is treated as an official quality warranty basis provided by Plumberstar as the valve supplier.

9. Can PPR double union ball valves be supplied consistently for repeat orders?

Standardized Production System for Consistent Quality
Plumberstar PPR double union ball valves are made with standardized molds and automated production lines. Key process parameters for core parts, such as the valve core, valve stem, and valve body, are locked in throughout production. These key standards won’t change, even for repeated orders.
Take an example. The injection molding temperature and pressure for PPR valve bodies, as well as the processing tolerance for stainless steel valve cores, all adhere strictly to the fixed SOP. This ensures that products from every new order are exactly the same as those in your first order. Size fit, sealing performance, and pressure resistance grade — all consistent. No installation issues caused by product differences.
Flexible Scheduling: Priority for Repeat Orders.
We set up exclusive order files for long-term repeat customers. The specs and delivery time of your PPR double union ball valves are put into the priority scheduling list.
Whether it’s a regular order or a custom one, as long as you place a repeat order, we don’t need to redo debugging or sample confirmation. Production can start right away.
For frequent small-batch repeat orders, we also support rolling inventory. We stock up in advance based on your historical sales data. This lets us deliver within 72 hours quickly.

10. What experience of PPR double union ball valve do you have with overseas projects?

We’ve built long-term partnerships with distributors and engineers in over 50 countries. We use their feedback on the PPR double union ball valve use overseas to keep optimizing product performance.
Take some examples. For the hot climate in the Middle East, we upgraded the valve body’s heat-resistant formula. For Europe’s demand for quiet pipelines, we optimized the valve core’s opening and closing structure. This cuts down water flow noise.
This kind of product improvement is based on real overseas project experience. It lets our products better meet the engineering needs of different regions.