1. What welding process is used for the tri-clamp manifold?

Plumberstar uses TIG welding. It keeps the welding area completely away from the air. All our welders are fully certified. They have over 5 years of experience welding high-pressure and sanitary pipes. They know how to read the molten pool. This makes sure every millimeter of the weld meets standards.

When welding, we use argon to protect the welding torch from the outside. We also fill the inside of the pipe with argon. This keeps the inner wall weld bright and free of oxidation. It meets the sanitary standards inside and outside. After welding, we grind and polish the welds. They blend in with the pipe surface. This gives the smoothness needed for sanitary grades.

Finally, we do pickling and passivation on the whole manifold. This is a chemical process. It removes surface iron ions from welding. 

2. What is the pressure test of the tri-clamp manifold?

Plumberstar tri-clamp manifolds are pressure tested according to international standards. These include food hygiene, water supply and drainage, and HVAC pipeline standards. All tests are done in our own factory. Every finished product is 100% inspected before shipping.

Before testing, we fully assemble the manifold. We make sure clamp interfaces, plugs, exhaust valves, branch valves, and fittings are installed correctly. Then we fix it on a special pressure test station. We use clean water as the test medium to avoid polluting the inner wall of the pipe.

The test has two parts: the shell strength test and the overall seal leakage test.

For the shell strength test, we use 1.5 times the rated working pressure. We hold the pressure for the required time. We check for deformation, leakage, or cracks on the main body. No obvious pressure drop and no appearance defects mean the test is passed.

For the seal leakage test, we use 1.1 times the rated working pressure. We hold the pressure and check for leaks. We make sure the valve has no internal leakage when closed, and no external leakage at any connection. It meets the zero-leakage requirement for hygienic systems. We record all test data, including pressure values, holding time, and results. Each record is linked to the production batch for quality traceability.

3. Can the tri-clamp manifold structures be customized?

Of course. As a professional valve customization factory, Plumberstar offers customers one-stop tri-clamp manifold customization. We cover structure, interface size, overall dimensions, and function integration.

We handle all custom work in-house, covering design, mold making, manufacturing, and pressure testing. We keep the standard quick clamp connection to guarantee solid sealing. We can tweak the whole structure to match your pipe layout, flow demand, installation space, and system setup, so the finished product fits your on-site conditions perfectly.

We can change the number of branches and the position of inlets and outlets to match your system. We support 2, 3, 4, 6, or more branches. This meets different pipeline directions and equipment connections.

For customers with special function needs, we can add parts like exhaust valves, blowdown valves, pressure gauge ports, temperature sensor ports, and flow control valves. The result is an all-in-one multifunctional quick-fit manifold.

4. How to ensure the center distance of the tri-clamp manifold?

Plumberstar has a full-process control system. It covers design, processing, tooling, and finished product inspection. This keeps the center distance of tri-clamp manifolds precise and stable.

In production, all manifold bodies are machined integrally by CNC. The program sets the hole position, depth, and angle in advance. Positioning accuracy is very high. This keeps the center distance error of each branch within ±0.05mm.

We also use special positioning jigs and center distance fixtures during welding and assembly. The manifold body is fixed firmly in a standard mold. This stops joints from shifting, tilting, or moving during welding or locking. Each joint follows the designed center distance. It avoids size errors caused by manual operation. After processing, our quality inspectors (with 10 years of experience) check each manifold one by one. They use digital calipers, height gauges, center distance templates, and 3D testing tools.

For mass production, we do first-article confirmation, in-process inspection, and full finished-product inspection. We also keep size traceability records. This ensures the center distance is consistent across the same batch and different batches.

5. What is the difference between brass and stainless steel tri-clamp manifolds?

Plumberstar sells two clamp‑on manifold sets. You can pick brass or stainless steel. These two materials do not work the same. They differ in use cases, sanitary levels, and pressure‑holding ability. We pick the best material for you. We look at your system working state, the flowing media, and the working surroundings.

Sanitary performance and target industries. Brass manifold sets mostly go into regular heating, underfloor heating, and domestic hot and cold water systems. They work well for common residential and building projects. Do not use them for food or pharmaceutical work. These fields need strict sanitary standards. Stainless steel is the common choice for sanitary fluid systems. It meets sanitary rules for food, medicine, daily chemicals, and pure water. You can use it directly for fluid split‑off and transport inside sanitary pipelines.

Most brass manifold sets come from mature forging, casting, or machining work. Standard units handle 1.0 MPa working pressure. Exact pressure limits depend on product size, wall thickness, joint design, and seal types. These products fit most building heating and home water supply systems.

Stainless‑steel manifold sets have good strength, stiffness, and anti‑corrosion performance. Standard products take 1.6 MPa working pressure. We can design and test higher‑pressure versions for certain sizes and strengthened builds. We follow your project needs to finish this work.

Material alone will not set the real pressure rating. Many other things change this value. These include main pipe diameter, wall thickness, port count, clamp joint shape, seal parts, and working temperature. Always follow the design data and pressure‑test results of your exact product model for real working pressure limits.

6. Do you maintain QC documentation for traceability for the tri-clamp manifolds?

Plumberstar keeps complete QC quality control files and full-process traceable records for a long time. For every product we ship, we save written and electronic records for each step. This includes raw material incoming, production, pressure testing, and finished product delivery.

Our traceability system starts with raw materials. When key parts arrive — such as stainless steel main pipes, quick-fit joints, valves, and seals — we register all related documents. These include material certificates (MTR), furnace numbers, batch numbers, supplier info, and incoming inspection reports (IQC). We link all of them to the production batch number.

During production, we record data in real time. This includes CNC machining settings, welding records, assembly steps, tool usage, and in-process inspection data (IPQC). Every process can be traced.

For the important pressure tests of quick-fit manifolds — including shell strength and seal leakage tests — we log details for each unit. We record test pressure, holding time, result, inspector, and equipment number. This forms a full pressure test report (FQC). We do a 100% full inspection, full recording, and full traceability.

Every finished product has its own unique production batch number. With this number, you can look up the full chain: raw material batch, production process, test data, assembly staff, and shipping information.

All QC files are saved in both paper and electronic versions long-term. When you need them, we can provide a full set of quality documents at any time. This includes inspection reports, pressure test records, material reports, and certificates of conformity.