German MVA temperature control valve, original import from Germany

German MVA was founded in 1980. Since then, it has been engaged in the planning, development, production, sales, and trading of various precision measurement and process engineering systems. MVA focuses on independent temperature control valves and related components associated with process engineering, such as fittings, measuring equipment, and piping systems. With over 30 years of experience and a targeted goal of further developing, improving, and simplifying products and processes, MVA can guarantee the highest quality application requirements for its customers. For many years, MVA employees have been shaped and challenged by this goal, resulting in or ensuring very high flexibility and customer proximity.

Application industries for German MVA temperature control valves

For 30 years, MVA has provided experience in customer-specific problem solutions and subcomponents for almost all engineering fields, including: plant engineering, such as quick-connect fittings for pipes and hoses; container construction; chemical engineering; power plant construction; mechanical industry; medical technology, such as magnetically coupled gear pumps; oil filtration/cleaning; pharmaceutical industry; shipbuilding; environmental engineering; process technology; industrial electronics. MVA provides very intensive on-site consultation, designs and finds the best components for your use, and modifies commercially available brands for very specific applications.

Main products of German MVA

MVA pneumatic actuators

MVA double changeover valve, DUKE DN 25 .. DN 200 type

MVA flap valves, ball valves, diaphragm valves, or seat valves

MVA oil filtration, oil cleaning

MVA swing check valves

MVA automatic control elements

MVA automatic temperature control valves: such asM150T temperature control valve with manual operating handle, for temperature control applications in lubrication or cooling circuits for oil, water, and solar systems: compressors, large electric motors,gearboxes, steam turbines, gas turbines, water turbines, wind turbines, chillers, solar systems. To date, we have supplied 20, and 000 multiple temperature controllers have been used worldwide.

MVA temperature control valve external operation: such asThree-way control valve with rotor segment series RFS-150-D.MVAElectric and pneumatic control valves are available for mixing and bypass control in water or oil circuits. The temperature control valve is constructed as a three-way valve, and its proportional or control behavior depends on the process controller used. Internal fittings are usually made of stainless steel, and seals are made of NBR, VITON, or PTFE,MVAThe electric or pneumatic fittings all use high-quality actuators from well-known German manufacturers.

MVA volume compensator - valves specially designed for the chemical industry

MVA industrial electronics

Precautions for using German MVA temperature control valves

MVA temperature regulation and control is a difficult task in automatic control execution. There are four aspects to note regarding temperature control valves:

1) Impact of MVA thermal expansion and cold contraction

MVA high-temperature valves and ambient-temperature valves differ significantly in structure and internal components, such as guide clearance, valve plate rotation clearance, and bearing arrangement. In addition to controlling these factors through design and manufacturing, it is more advisable to minimize the effects of thermal expansion and contraction by selecting an appropriate valve body structure. Practice has proven that flap-type butterfly valves are excellent temperature valves; the clearance between the flap and the valve body cavity is 3–6 mm, which completely resolves the issue of valve plate jamming within the valve body cavity at high temperatures and achieves high shut-off performance (5×10-4). For applications where the medium temperature exceeds 400℃, standard guided structures are unreliable. In such cases, an external bearing structure should be adopted to ensure the positioning and support of the valve plate, thereby avoiding the impact of internal high temperatures on the guiding structure. Hualin Company invented the "Ri"-shaped patented positioning system, which provides excellent positioning, support, and protection. It ensures accurate longitudinal positioning of the valve plate, preventing blockage caused by sagging due to gravity. Meanwhile, since the positioning system bears the weight of the valve plate and valve stem, it reduces the load on the actuator and the external bearings, avoiding the unilateral jamming phenomenon common in horizontally installed conventional butterfly valves, and allows for vertical installation.

2) Selection of MVA sealing method

Achieving high shut-off performance under high-temperature conditions is difficult, and many conventional high-performance sealing methods are not advisable (such as O rings, PTFE materials, elastic metal materials, etc.). Within 500℃, special composite graphite valve seat soft sealing methods can be used. Typical products include Hualin's soft-sealing high-temperature O type shut-off ball valves, V type ball valves, and soft-sealing high-temperature full-function ultra-light regulating valves. Under conditions above 500℃, only metal-to-metal hard sealing methods (typically using butterfly valve structures) can be employed. To prevent jamming caused by material expansion at high temperatures, the sealing clearance is usually kept large, resulting in a higher leakage rate. To address this issue, Hualin Company developed a high-temperature baffle-type butterfly valve. It uses a process where the flat baffle (valve plate) rests on the protrusion of the valve body (integrated), forming a circular line sealing surface to achieve excellent sealing results, with a leakage rate of only 10-3~10-4. Additionally, wear-resistant alloy overlay welding on the sealing surface enhances the valve's sealing reliability and extends its service life.

3) Temperature resistance of MVA packing

Standard PTFE packing can only be used in applications below 200℃. If used in medium to high-temperature applications, an extended bonnet must be used to prevent the packing from being affected by extreme temperatures. However, longer and thinner valve stems have poor strength under high-temperature conditions and are prone to bending. Therefore, under high-temperature conditions, flexible graphite packing with excellent temperature resistance (up to 600℃) should be used, which can also significantly reduce the height of the extended bonnet. At the same time, combining "rotary valves + thick valve stems" improves the overall strength of the valve, effectively solving this problem.

4) Selection of MVA valve body and internal component materials

For regulating valves used in environments above 450℃, the influence of temperature and pressure conditions on the mechanical strength of materials must be considered during design and selection. For example, in high-temperature conditions in boiler feed water systems and superheated bypass systems, conventional valve body and internal component materials are not suitable (such as O rings, PTFE materials, elastic materials, and standard gaskets). Therefore, more durable materials must be selected. The maximum usable temperature for general materials is around 500℃. For applications above 538℃, chrome-molybdenum steel is typically used for the valve body. For applications with maximum temperatures reaching around 1035℃, SUS310S stainless steel is usually selected, and the carbon content of the material must be controlled between 0.04 and 0.08%. For higher temperatures, it is recommended to use non-metallic heat-resistant lining materials (suitable for high-temperature applications up to 1200℃) or special high-temperature high-strength alloys (such as those used in engine combustion chambers, which can be directly used in high-temperature applications up to 1000℃).

German MVA temperature control valves, also known as MVA temperature regulating valves, are characterized by requiring only a standard 220V power supply. They utilize the energy of the controlled medium itself to automatically regulate and control the temperature of media such as steam, hot water, hot oil, and gases. They can also be used to prevent overheating or in heat exchange applications. These valves feature a simple structure, easy operation, wide temperature adjustment range, fast response time, and reliable sealing performance. They allow for adjustment during operation and are widely used in hot water supply for chemical, petroleum, food, light textile, hotel, and restaurant sectors. Weidou Intelligent Technology professionally acts as the agent and distributor for GermanMVA temperature control valves, German MVA temperature regulating valves,We welcome inquiries and orders from all users.