In the national key special core high-end general-purpose chips and electronic products, basic software products, large scale integrated circuit manufacturing technology and complete sets of technology, large aircraft, gas turbine (aeroengine) and other projects, thermal barrier coating, thermal interface, Materials with micro / nano structure, such as thin films and porous media, are of crucial importance. The accurate measurement of thermal properties plays a key role in the completion of the project. Institute of heat and mass transfer center developed and set up with the leading international level and independent intellectual property rights of dual-wavelength femtosecond laser pumping - detection of thermal reflection measurement system. The use of femtosecond laser ultra-high heat flux density and ultra-short pulse characteristics, with the traditional thermophysical measuring instruments can not reach the spatial resolution, enabling nano-micron scale film, interface, porous media, powder and other materials thermal physical accuracy measuring.

Based on the technology of dual-wavelength femtosecond laser pumped-detection thermal reflection measurement system, based on the principle of modular design, repeated design verification, material verification and process verification are strictly carried out in the demonstration, engineering design and manufacture to application demonstration To ensure the reliability, safety and function indicators, the optical system, the circuit control system and the data acquisition system are realized modularized and integrated, forming an independent and industrially producible core machine, and the system can be established to achieve system weak signal Extraction and data processing integrated control software.

For different applications, the development of the instrument can focus on the following issues: large-scale integrated circuits, high-power laser thermal management of thin film materials and interface thermal transport characteristics difficult to accurately measure the problem; high performance aero-engine turbines, combustion chambers and aircraft high temperature Thermal insulation properties of the key components of the thermal protective coating materials, coating - substrate interface thermal resistance, difficult to accurately measure the thermal conductivity of high thermal conductivity carbon / carbon composite materials; thermal properties and heat transfer properties of the new high efficiency nano energy-saving materials Difficult to accurately standard problem. The development of this instrument will serve the fields of microelectronics, optoelectronics, aerospace and industrial energy conservation, etc., and will be able to break through the development bottlenecks brought about by heat transfer and promote the rapid development of new functional materials research and applications in the above industrial fields.

This project has been specially supported by the development of major national scientific instruments and equipment.

Instrument renderings

Modular, integrated thermophysical characterization instrument for micro / nano structure materials

Metal Seated Butterfly Valve

Double-eccentric metal-to-metal sealed Butterfly Valve

Summary:

Flange double-eccentric metal-to-metal sealed butterfly valve is operated by worm gear to decelerate to drive the disc to rotate within 90°.It can be applied to cut off or regulate the flow of media. The valve can be actuated by operating lever, handle wheel, electric actuator or pneumatic actuator. Underground valve can be operated by an extended Spindle. No matter operated by electric actuator or pneumatic one, positions where the valve is opened and closed are all equipped with limit switches and indicating devices that synchronically show the opening state of the disc.

Structure:

Being double eccentric, when opened, the sealed ring of the disc is automatically off-seated after only a little degree of opening movement. The sealed ring completely bears no external pressure, which helps the valve keep longer life.

Butterfly valve has the capability of bi-directional sealing, which achieves no leakage in both primary and secondary directions, especially applicable to underground water-supplying network of pipes with circular multi-sources. If only unidirectional media, when installing the valve, the primary direction is of priority.

The position of sealed ring can be adjusted in all directions to modulate the compression of the sealing, which makes the valve able to be operated by minimum torque.

The base ring of the body and the sealed ring of the disc all employ stainless steel of excellent quality, which are competent of high temperature and anti-corrosion and long service life. The sealed structure of the valve uses divided-body design, dependable interchangeability, easy to apply and maintain.

As to those valves whose DN is equal or larger than 1200 mm, the disc applies the flying-disc design with a result of light weight, high rigidity, powerful strength, small flow–resistance and Low loss of pressure.

The stem and disc use a positioning pattern of non-penetration and pin–offset to avoid shearing and abrasion of the spline caused by frequent shifting of the upper stem and to prevent abnormal opening and closing of the valve.

Between the stem and the body [o" ring , a kind of environmentally-protecting rubber is applied, which not only achieves no maintenance but also reliable sealing, meanwhile, overcomes potential leakage when stuffing and sealing as well as prevents stuffing`s pollution of the water.

Technical characteristics:

Automatic assembly and coating product line and developed process-flow ensure the outstanding ability of anti-corrosion and flawless appearances of products.

Anti-corrosion performance:

Inside and outside surfaces of the body are coated with electrostatic epoxy resin powder. The coating is even and firm with good adhesion and excellent anti-corrosion.

Sanitary standard:

Non-toxic epoxy resin powder used comply with EN sanitary standard.

The coated resin is in accordance with standards of potable water

Applying area:

The valve can be used in potable water system, water supply and drainage, heat supply, gas, metallurgical industry, energy system and pipeline and so on.



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