OUR PRODUCTS, OUR SERVICES, OUR KNOWLEDGE:
Each valve is unique and requires comprehensive solutions to meet customers’ expectations when it comes to configuration, installation, and final application.
We do NOT just simply select the valves and drop them to the customers. Instead, we listen to our customers about what they need, provide our solutions after evaluation, and then we decide what to offer to our customers for their benefits.
Wherever and whenever valves are needed, DAVINCI VALVES will always have its suitable valves, fittings and accessories in position for you. You deserve a partner who can meet all your requirements for a win-win cooperation in the long run.
Your partner of reference.
You deserve DAVINCI VALVES.
So, let´s talk about your project today.
OUR MANUFACTURE PROGRAM IS BASED ON CENTURIES TRADITION:
THE MATERIALS OF OUR MANUFACTURE PROGRAM:
The materials of which most of DAVINCI VALVES LTD are made of depends on heat resistance, the pressure action, the medium ﬂowing through the valve, the size and of course as the most important point, our customer technical speciﬁcations. The wide range of materials the most of the valves bodies of DAVINCI VALVES LTD are done ﬁt in three main production sections: stainless stell, steel and cast iron.
1.4308 (ASTM A 351 Gr. CF 8) This steel consists of a chromium-nickel alloy and has good corrosion resistance and can be given mirror ﬁnish. This stainless steel is mainly used for valves exposed to aggressive media or environments.
1.4462 (ASTM A 182 Gr. F 51) This stainless steel belongs to the group of duplex steels and its micro-structure consists of a mixture of austenitic and ferritic crystal grains. Have high corrosion resistance and excellent strength. It is frequently used for the manufacture of valves installed in aggressive media or sea water.
1.4571 (ASTM A 182 Gr. 316 Ti) This type of stainless steel is an austenitic steel and has good weldability and does not need to be tempered. Also have a very high corrosion resistance. The areas of application of this stainless steel primarily include the manufacture of welded valves suitable for use in aggressive media.
1.4408 (ASTM A 351 - CF 8 M) This stainless steel is a cast version of chromium-nickel-molybdenum steels and have excellent oxidation resistance. This stainless steel is primarily used for valves exposed to aggressive media and also in the chemical industry.
Structural steel S 355 J 2 WP / S 355 J 2; ASTM A 242 Type 1 / ASTM A 572 Gr. 50 This steel is used for constructional steelwork and hydraulic steel construction and it is weatherproof, less susceptible to corrosion, has lower sheet/plate thickness, does not need to be pre-heated and has a smaller seam volume.
Forged steel P 250 GH; ASTM A 105 / ASTM A 668 Class F / ASTM A 516 Gr. 60 What is good about this stainless steel is that it can be used in temperatures of up to 480 °C as it is heat resistant and have great weldability. This forged steel is used for manufacture of forged valves.
Welded steel S 235 JR G 2 / S 235 JR + AR; ASTM A 283 Gr. C Advantage of Welded steel is his high breaking strength and use of this steel ﬁts in the manufacture of welded valves. H II P 265 GH; ASTM A 516 Gr. 60 This kind of steel is very heat resistant and it is very durable, e.g. due to heat insulation layers. The manufacture of pressure welded valves requires use of this steel.
EN-GJL-250 EN-JL 1040 / GG-25 / ASTM A 48 40 B / EN-JL 1040 cast iron is an iron-carbon-silicon casting alloy whose lamellar graphite gives to the cast iron very good self-lubricating caracteristics when it is cut during the manufacture process. What is good about EN-JL 1040 cast iron is its vibration damping, its castability, its machinability, its resistance to the corrosion and its high thermal conductivity.
EN-GJS 400-15 EN-JS 1030 / GGG-40 / ASTM A 536 Gr. 60-40-18 / EN-JS 1030 cast iron is an iron-carbon-silicon casting alloy in which the graphite is present in the form of spheroids and the properties of this material are similar to steel, such its high castability, strength and toughness. What is good about EN-JS 1030 cast iron is its high elongation at break and its high strength and toughness.
EN-GJS-400-18-LT EN-JS 1025 / GGG-40.3 / EN-JS 1025 cast iron is an ironcarbon-silicon casting alloy in which the graphite is present in the form of spheroidsand the properties of this material are similar to steel, such its high castability, strength and toughness. This cast iron has high elongation at break, also has high impact bending and bar strength. Use of this material can perfectly ﬁt in applications for valves with low temperatures or higher nominal pressures.
EN-GJS-500-7 EN-JS 1050 / GGG-50 / ASTM A 536 Gr. 65-45-12 / EN-JS 1050 cast iron is an iron-carbon-silicon casting alloy in which the graphite is present in the form of spheroids and have high stregth properties, but low elongation at break which may be one of its disadvantages. What is good about EN-JS 1050 cast iron is its high tensile strength This material in valves production is used very rarely as its considered outdated.
AND INNOVATION TESTING:
All our valves are submitted to pressure, leak and function tests. And beside that we realize diﬀerent speciﬁc types of testings which assures
DAVINCI VALVES LTD quality product range like:
Coating Thickness Test
Magnetic inductive test to determine the thickness of coatings or corrosion-inhibiting coating agents, minimum coat thickness >250 m. No bubbles may develop in the coating during this test.
The pull-oﬀ test is used to test how well the coating is bonded to the raw material. The minimum adhesion on the core and the moulding sand sides is tested with pulling force of >12N/mm2. The test pieces are inmersed for seven days in delonised water at 90ºC and then dried in an oven for 3 hours. A conditioning phase from 3 to 5 days in normal atmosphere is after allowed to elapse. No blisters may arise during the period inmersed in the water bath. The surface of the test piece is degreased and roughened with abrasive paper and after cleaned from dust with oil-free compressed air and recleaned.
Impact Resistance Testing
A pendulum which hits the surface with an energy of 5Nm with ﬁxed distance is used for impact testing. After each impact the component is electrically tested as no electrical breakthrough shall occur.
The coating is checked for freeness from porosity using a high voltage test device at a deﬁned test voltage. The test is performed using rubber electrode. The coating must be completely free of penetrating pores to avoif subsequent corrosion of the casting underneath.
The cathodic inﬁltration test is corrosion test that is carried out over period of 30 days at 23ºC. A defect is created on the coated surface of the test specimen, which is subjected to cathodic polarisation in a sodium chloride solution for the entire test period.
Cross linkage Testing
One drop of methyl isobutyl ketone is put on a horizontal epoxy resin coated surface of the test piece at room temperature. After 30 seconds the test area is wiped with the clean white cloth. It is checked that the test surface has not become neither matt or smeared, and that the cloth remains clean. The test is carried out 24 hours after the coating process.
Among all QUALITY and GUARANTEE Certificates we offer you, there is one we want to point beside, and that is a DAVINCI GATE VALVES Potable Water Specific WRAS Approval Certificate, which will assure you the best conditions of our gate valves for your potable water installations.
WRAS Approval: What Is It, And Why Is It Important?
What is WRAS Approval?
Whether you’re a tradesperson or a facilities manager, you’ve probably come across products bearing the WRAS seal of approval - but what exactly does WRAS Approval mean, and why is it so important?
The WRAS, or Water Regulations Advisory Scheme, is a subscription-based accreditation body whose membership comprises of all UK´s 26 water suppliers. The WRAS exists to promote and ensure compliance with the Water Supply (Water Fittings Regulations) all over the world.
The WRAS also offers an approval system, which acts as a way for manufacturers to demonstrate that their products - such as taps, valves and boilers - comply with the regulations. According to the WRAS, the regulations apply to ‘any water fitting which, when installed, will carry or receive water from the public mains water supply.
Once submitted by the manufacturer, a product will only gain approval after undergoing rigorous mechanical and water quality testing by independent laboratories. The product may also need to meet certain installation conditions in order to obtain WRAS Approval.
The approval system also covers non-metallic components and materials (such as rubber washers and gaskets), which undergo testing to ascertain their effect on the water with which they come into contact. Some materials can give the water an undesirable flavour or odour, as well as causing cloudiness or discolouration. Others can impart toxic chemicals to the water, or create conditions that allow bacteria and microbes to flourish. Approval will only be given once it has been demonstrated that the component does not contaminate the water in any way.
Once granted, WRAS Approval lasts for a maximum of five years, after which time the product will need to be resubmitted for assessment.
Ask for yours WRAS CERTIFICATE today!
In DAVINCI VALVES we give you the best expertize.
FOR ALL PROFESSIONAL WHO ATTEND
THE WORLDWIDE VALVES EVENTS:
DAVINCI VALVES LTD assures to be present at the most important events and international fairs all over the worldwide. You may allways contact us to get in touch and have a personal meeting at those. Keep updated through our linkedin account and make assure to keep in touch: firstname.lastname@example.org
AQUATECH (Shanghai, China) FLOWTECH (Shanghai, China) VALVE WORLD EXPO (Düsseldorf, Germany) WIE TEC (Shanghai, China) AQUATECH (Amsterdam, Holland) POLLUTEC (Lyon, France) IFAT (München, Germany)