‘Flying high’ with their double offset ‘butterfly’ valves – that’s Huamei Machinery….

New IM online member, Ninjin Huamei Machinery is a professional manufacturer of double offset, high performance, butterfly valves, available in soft seat, metal seat and fire-safe seat designs. The advanced sealing technologies of these products ensures reduced seat wear and a highly effective, bi-directional, zero leakage shut off function throughout the full pressure range.

leading the way 

With unique valve-seat design, which equal Flowseal and Bray, the Huamei Machinery company has now become the leading manufacturer of double offset, high-performance butterfly valves throughout China. The business has a CE PED approved foundry and all products are manufactured under an ISO 9001 Quality Assurance Program. This ensures each valve product meets –  and very often exceeds – all and every customer application and performance requirement.

innovation and passion 

Huamei Machinery is totally committed to the needs of customers, and its passion for innovation, product quality and dedication to responsive service will never change. Superior pre-sale & after-sale services are very actively pursued by the business,  and in step with this all contact enquiry messages  are responded to within eight hours by our outstanding sales or technical experts.

What is a (double offset) high performance butterfly valve?

A High-performance butterfly valve is generally made to use on the high-pressure piping system. The high-performance double offset butterfly valve, used in higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear.


Huamei high performance butterfly valve offers the high-performance butterfly valves with the low-cost, lightweight benefits of a butterfly valve design. It is ideal for handling water, oil, steam, gas, and slurries.

Huamei high-performance butterfly valves satisfy a wide range of industrial applications. Available in carbon steel or stainless steel, as well as lug and wafer body styles, they can be specified in sizes 2″ through 60″.

Main Product Features 

Double offset/eccentric design with bi-directional bubble-tight shutoff performance, extremely high pressure application than ordinary butterfly valves; Double offset/eccentric configuration with conical angled disc design; Long life durability due to double offset operating principle minimizing seat wear; High pressure application with small torque.

Maximize flow and minimize resistance providing high Cv; Seat available in either Soft (PTFE/RTFE), Metal or Fire Safe; Fast and simple seat replacement. All of soft seats, Metal seats and Fire Safe seats are inter-chageable ; Excellent corrosion resistance and finally internal travel stop design to prevent over travel of the disc, minimizing possible seat damage.

How it works?

The double offset design of the Huamei High-Performance Butterfly Valves assures reduced seat wear and bi-directional, zero leakage shut off throughout the full pressure range.

At the initial point of disc opening, the offset disc produces a cam-like action, pulling the disc from the seat. This cam-like action reduces seat wear and eliminates seat deformation when the disc is in the open position. 

extended service life

When open, the disc does not contact the seat, therefore seat service life is extended and operating torques are reduced. As the valve closes, the cam-like action converts the rotary motion of the disc to a linear type motion to effectively push the disc onto the seat. The wiping action of the disc against the seat prevents undesirable material build-up from slurries or suspended solids.