FAQs of Balanced Valve

What are the main types of balance valves produced?

Our factory primarily produces manual balance valves, automatic balance valves (including dynamic/static types), visual flowmeter balance valves, and other three categories, utilizing mainly brass and stainless steel materials. Manual balance valve is suitable for small and medium-sized HVAC and industrial circulating water systems; automatic balance valve can adapt to system pressure fluctuations, suitable for large supermarkets, office buildings, etc.; visual flow meter balance valve integrates flow monitoring function, more commonly used in pharmaceutical, electronic plant, and other scenarios.

What is the difference between balance valve and ordinary control valve?

The difference is that the function focus is different- an ordinary control valve is more focused on “flow regulation”, while the balance valve focuses on “system hydraulic balance” as the core, with a dual role of flow regulation and pressure stability, and distribution of the branch flow, to avoid local overcurrent/underflow. Industrial systems prefer balancing valves.

Do you provide export-related documents for overseas customers?

Our factory can provide export-related documents and support third-party inspection. Including commercial invoice, packing list, bill of lading, certificate of origin (CO), certification report (such as UL, CE), and other documents required by customers. Document processing fee: regular documents are free, special certification documents (such as FORM A) are charged according to the actual processing cost, which can assist customers in connecting with customs brokers to ensure smooth customs clearance.

What standards does the pressure rating and sealing performance of the balance valve meet?

Products fully comply with EN 12516-2 (European HVAC valve standard), and some product models are UL and FM certified. The pressure rating of the conventional brass balance valve is PN16 (16bar), and the stainless steel model can reach PN25; the seal is made of EPDM or PTFE material, and the leakage conforms to the ANSI B16.104 Class V standard. The leakage under normal temperature is zero, and the leakage under high temperature conditions is ≤0.1ml/min.

Is there a special balancing valve solution for high temperature steam systems?

There’s a solution. For high temperature steam systems up to 350℃, equipped with high temperature sealing parts (graphite packing +Inconel alloy shaft) and optimized body heat dissipation structure to ensure stable operation at high pressure of 16 bar. It has been applied to steam thermodynamic systems in food processing and printing and dyeing plants.

What are the conditions of the product that belong to the warranty scope?

The warranty scope includes: ① unqualified materials (such as cracking of valve body, material inconsistent with inspection report);② manufacturing defects (such as seal leakage, adjustment failure);③ accessory failure (such as pressure gauge damage, automatic valve sensor failure). Man-made damage is not covered by the warranty. For example, violent operation during installation leads to deformation of the valve body or use beyond the operating range (such as cryogenic valves for high temperature systems), etc.

What is the risk when the maximum differential pressure of the system exceeds the balance valve rating?

There is a risk that the accuracy of valve adjustment will decrease, resulting in unstable flow control, rapid wear of the seat and seal, and a shortened service life. In extreme cases, the valve may jam or fail. When we also have certain solutions, such as the selection of a high-pressure balance valve (such as the PN25 model) to replace the original model, or installing a pressure relief valve in front of the balance valve, the pressure difference will be controlled in a safe range.

How about wear resistance of valve shaft, valve seat and other vulnerable parts?

Hardened shaft (surface hardness HRC 50 or above), seat made of wear-resistant alloy material, which can withstand more than 100,000 times of adjustment operation under normal conditions without obvious wear. We provide spare parts such as valve shaft, valve seat, and seal ring from stock. The spare parts price is 5% to 15% of the finished product price.

If the product does not match the system, can I return it? What’s the process?

If the product does not match the system due to a factory selection error, it can be returned unconditionally, and we shall bear the freight. However, if the issue is caused by incorrect parameters provided by the customer, it must be reported within 7 days after receiving the goods. The product can be returned without installation and damage, and the customer shall bear the return freight and a 10% restocking fee. Return process: submit application → our review → send back products → inspection confirmation → refund/replacement.

How long is the service life of balance valve?

Under normal conditions, the service life of a brass balance valve is 8-10 years, and that of a stainless steel balance valve is 12-15 years. The more corrosive the fluid medium, the shorter the life. The long-term approach to the highest temperature will accelerate the aging of seals, and the frequent adjustment of manual valves will increase the wear of the valve shaft.