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SME is an industrial supplier for hose couplings, flange joints and assorted types of industrial-grade pipe fittings and valves. The Company features the unique geographic advantage in one of the largest and the most congregated centers for non-ferrous metal productions in Wenzhou Zhejiang Province of China.

SME is therefore able to make the full use of every penny invested in producing world-class qualities (of quick-disconnect hose couplings of majority). We are proud to be one among those who are dedicated to improving the fluid connections in all industrial pipeline systems.
SME is short for "Sheng jiang" Mechanism and Equipment company, taking "jiang" from Ou-jiang river across Wenzhou city. It was the family business established and followed from massive production of mechanical equipments in complying with universal standards home and abroad.
SME came to its name and was founded by Mr. Lee Sunlong since mid 2004.
China production can be associated with "mass produced", "cheap" and "poor safety standards" more than anything else. Learning to divert the concept of being cheap to better management on cost and risk controlling, we are making a different way of living.

Our team incorporates skilled members who excel at OEM on solid products or computer model and master craftsman who know by heart the metal forming and producing processes. SME is devoted to approaching the market with low-cost, feature-rich products.
In terms of shipping for domestic business, we intend to provide 24-hour delivery. The running flow of 60〜80% of our complete product program (esp. quick-disconnect couplings and flanges) are being formed on 6 floors of racks, 1.000+ pallets on and over in inventory in a spacing of over 2.000 square meter large.
We are keeping track of historical shipping data for timing storage of particular items and because of that we are capable of pre-storing interested products prior to customers' requests.

Pre-stock is an additional service from SME. Stock in types of core materials, half products or end products are retained based on one or combined long-time, esp. a quarter or an annual requirement from international consumers.
To understand the manufacturing orientation of Wenzhou. Wenzhou inherits the superiorities of traditional industries, renovates and upgrades it with high and new technology and spurring on industrial modernization with information technology. Wenzhou has formed a complete industrial production system covering machinery, electricity, chemicals, ship-building, electrical power; building materials, light industrial products and textiles, foodstuffs, tanning, plastics, warehouse, superior steel and arts and crafts.

Wenzhou boasts many featured products, including shoes, apparel, electrical equipment, lighters, optical glasses, auto parts, valves, stainless steel, stationery, locks, synthetic leather; toys and playgrounds, packaging machinery, packaging bags, plastic machinery, sanitary ware, printing services and promotional gifts etc.

Their production bases are laid out in Lucheng District (鹿城), Ouhai District (瓯海), Longwan District (龙湾), Rui'an City (瑞安), Yueqing City (乐清), Cangnan County (苍南), Pingyang County (平阳) and Yongjia County (永嘉), which are all county-level administrations under Wenzhou.
Lucheng District, Ouhai District and Longwan District serve as main urban areas of Wenzhou. In Lucheng and Ouhai, there are numerous manufacturers for shoes, optical glasses, lighters and apparel. In the Industrial Zone of China Shoes Capital, you will be amazed at so many shoes factories there. Also, these two districts have the majority of Wenzhou's suppliers for apparel, optical glasses and lighters, though the industry of lighters is undergoing a tough time these years.
Longwan District, where Wenzhou Airport is located, has many different industries, including stainless steel, valves for sanitary use, sanitary ware, stationery, synthetic leather and locks, some of which you can also find in Ouhai District.
Yueqing City is most famous for its electrical equipment. If you go to Liushi, a township under Yueqing City, you will see advertisements of electricals everywhere. Yueqing is also the birth place of many famous electrical brands in China, like CHINT, CNC and PEOPLE etc.
Rui'an City is in the south of Wenzhou, where there are many factories for auto parts and packaging machinery. A township called Tangxia gathers most suppliers for auto parts. Also, it is called a production base for cloth and injection shoes.
Yongjia County is famous for its Nanxi River; a hot tourist spot in Wenzhou. Well, the county also gives birth to many competitive industries, including valves in its Oubei Town, playgrounds in its Qiaoxia Town and buckles, buttons and zippers for shoes and apparel in its Qiaotou Town.

Pingyang County and Cangnan County are the most southern parts of Wenzhou, where you can find a lot of factories for promotional gifts, packaging bags, labels and plastic machinery which are used to produce plastic bags, and printing services.
Aluminum products are produced in volume by gravity casting. This method uses the force of gravity to fill a permanent mold with molten material without application of any external pressure. It will ensure that there will be less bubble vacancy formed during this process as compared to press casting method like die casting. Gravity casting has advantages of cost effective and good quality. Aluminum couplings are made from alloy base of aluminum grade #A356 and #A380. After treatment like T6 heat treating that involves the use of heating to extreme temperatures for hardening purpose is carried out 100% on each coupling. Heat treating is generally more economical and more controllable. To begin the process, a cast iron mold capable of producing tens of thousands of castings must be made in at least two sections to permit removal of castings. In the casting cycle, the die caster clamps the two die halves tightly together. Molten metal is poured into the die cavity where it solidifies quickly. The die halves are drawn apart and the casting is ejected. Die casting dies can be simple or complex, have movable slides, cores, or other sections depending on the complexity of the casting.
Our stainless steel products are made by investment castings. It is a process that derives its name from the fact that the pattern is invested with a refractory material. Compared to other casting processes such as die casting or sand casting, it is an expensive process. However the components that can be produced can incorporate intricate contours, and in most cases the components are cast near net shape, so requiring little or no rework once cast.
Investment casting features pattern trees and the repetition of layering process. Pattern trees or clusters are mounted after wax patterns are set, cooled and carefully checked following the coating repetition.
Investment is produced by three repeating steps: coating, stuccoing and hardening. The first step involves dipping the cluster into a slurry of fine refractory material and then letting any excess drain off. So a uniform surface (prime coating) is produced. This fine material is used first to give a smooth surface finish and reproduce fine details. In the second step, the cluster is stuccoed with a coarse ceramic particle by dipping it into a fluidized bed, placing it by applying by hand or in a rainfall sander. Finally the coating is allowed to harden. These steps are repeated till the investment thickness is achieved which is usually 5 to 15 mm.
The investment is allowed to completely dry, which can take 16 to 48 hours. It is then turned upside-down and placed in a furnace or autoclave to melt out the wax. The mold is subjected to a burnout, which heats the mold between 870 °C and 1095 °C to remove any moisture and residual wax, and to sinter the mold. Before investment mold is placed cup-upwards into a tub filled with sand. The metal is thereafter gravity poured. In final procedures the shell is hammered to release the casting which will be cleaned up to remove signs of the casting process by grinding.
Our stainless steel products are made from standard materials AISI #316 or casting grade CF8M, #304 / CF8 and available on request with similar German reference #1.4408, #1.4401, #1.4301 or custom Hastalloy and Monel. Material correctness is closely checked and restored in database, based on which material certificate can be retrieved upon request.
As stainless steel is usually chosen for chemical aggressive applications, strict controlling methods like heat-numbered tracing system and penetrating checks are usually organized.
Forging is the shaping of metal using localized compressive forces. It can produce a piece that is stronger than an equivalent cast or machined part. As the metal is shaped during the forging process, its internal grain deforms to follow the general shape of the part. As a result, the grain is continuous throughout the part, giving rise to a piece with improved strength characteristics.
Production forging involves significant capital expenditure for machinery, tooling, facilities and personnel. In the process of hot drop forging, a high temperature furnace is required to heat the billets before it is pressed and deformed under the massive weight of over thousands of kilonewton (hundreds of tons) by large forging hammers.
Forged pieces taking the general shape are trimmed before the second step of machining. In most cases the semi- finished pieces need to get deburred as in grinding pools following final checks and packaging.
Our brass alloy products are made by above mentioned drop forging method using 100t ~ 1.000t electric friction screw press machines. Certified copper alloy to China code #57-3 or similar German reference #CW614N and #CW617N are monitored throughout the whole production.
Our polypropylene products are made of 25~30% acid resistant glass fiber (GF) added black polypropylene (PP) formula through injection molding process. Enhanced strength and durability has approved by tests in accordance with ISO specifications as follows. Nylon products are made of 25~30% acid resistant glass fiber added yellowish nylon formula through injection molding process. It is with excellent resistance for abrasion and aggressive chemicals.
Nylon is found even stronger than PP bodies according to our internal testing. Additional pull testing and torque tests are made in respect to simulating the actual over-rated force in use.
We use fumigation-free packing materials for shipping the complete program of our products. Every piece is protected safe and tight with foam and plastic bags with thread and surface protective covers. We set our standard packing quantity for cartons, boxes as well as pallets. Clear markings in big white-and-black characters are made on front, side and top facades of each pallet carefully foam protected and supported by four solid top-to-bottom cylinders on all corners.
Multiple packing materials and case-by-case quantity packages are provided against scratching and cutting in surfaces from vibration during transport.
• EUR marked pallets
• Plastic bags = protecting whole bodies of products • Plastic thread covers and web sleeves = protecting outside / male threads
• Grease paper = protecting anti-rust oil on esp. non-plating steel made products • Foams = protecting esp. non-plating steel made products from high moisture environment like during sea shipment.
• Clear markings outside pallets contain basic information in our standard supplies as follows. • Customers purchase reference and order number
• Package content relative • Our item description in English, other sayings in other languages possible on request • Our item description of products, size, quantity
• Green-light label in case thus package passes final spot check on request

Proven quality safeguards the life of both the users and the whole supplying vitality. We are therefore in continuous pursuit of developing strict, stable and reliable controls over both production methods and inspection processes.


A - Controls and inspections on source of materials

Material ingots are sourced from quality vendors with proven stability and continuous supply capacity. When custom material or special alloy is required we are organizing a different yet quick-reacted line of production so as not to affect the normal working routines on daily basis. It is on the other hand of utmost importance that we can thereafter establish tracing systems from material to processing for specialties especially of cases like high-value-yet-low-volume custom made. Definite heat numbers or batch numbers are engraved permanently at visible positions on bodies.


• Metal materials are proven in every process since when we check the correctness of the resources. The information is kept in database that can be restored in case of request.


Final products are double confirmed using spectrum analyzer before inventory. We are using a handheld Olympus Innov-X Alloys and Metals Analyzer that identifies alloy grades of esp. stainless steel and copper alloys in seconds. With its in-built material database the result is automatically made and instantly read so that we are able to approve the quality beyond eyes right before shipping.


B - Controls and inspections on dimensions prior to, in the middle and after productions

Most of our products are dimensionally specified in relevant standards published by industry authorities like BS, DIN, ASTM, etc. We are following them strictly in order to make sure of the interchangeable of every coupling with worldwide manufacturers who are producing according to norm.


Computerized models from CAD 2D / 3D drawings are developed to help perfect the molding structure. We pay highest respect to mold makers who are dedicated to sculpturing the optimal base for different forms of productions so that productiveness is enhanced while production cost can be saved.


• We stamp our names in confirming all drawings of dimension and technical details.


• Standard calibers, self developed gauges and tools are used in crucial processes case by case. Curve tools are custom-made for cam and groove adapters curve; for safety clamp rib distance as in right image; and for TW fittings crown closeness and so on.

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