- Up to 28mm of tolerance,DN40~DN450 stock reduction
- Allows angular deflection of +/-3° per gasket.
- Covering most common pipe materials
Unique gasket with circumferential ribs sealing on corroded,scored
or pitted pipes
- Thickness:Epoxy powder coating of 200-250μm
- Temperature:Spraying temperature over 200℃
- Doesn't fade,even with diethyl ether
- Epoxy powder:Earth Best!
- Nuts:DACROMET or GEOMET,Earth Best!
- Cast iron:EN-GJS-500-7,nodularity over 95%!
WESDOM Group. Headquartered in ZhengZhou, which is the geographical
center of China, Central Plains hinterland,China's major railways,
aviation, highways, electricity, post and telecommunications hub
cities, International Air Logistics Center, also an international
dry port city!
Group consists of six companies, in addition to HeNan WESDOM Import
and ExportTrading Co., Ltd. which is specialized in the import and
export of foreign trade, the other five companies all producing
factories, mainly located in Tianjin, Hebei, Liaoning and Zhejiang.
The major products for a variety of valves of cast iron, steel,
stainless steel, copper materials; malleable iron and stainless
steel pipe fittings; ductile iron, stainless steel fittings;
flanges and other products, mainly used in construction, petroleum,
chemical, power, water supply and drainage, municipal, medical
people's livelihood and other industries.
|Q1: How long is the delivery time?|
A1: Generally it's 5-10 days we have stock. Or it's 15-90 days
depend on different product and quantity.
|Q2: What about the payment term?|
A2: T/T 30% deposit, balance payment after finished production
before shipment. Or as discussed.
|Q3: Can I have a sample order?|
A3: Yes, we agree sample order, mixed different models is also
|Q4: What's your MOQ?|
A4: We can support 1 pc order. Welcome you to check our quality.
|Q5: What's your quality inspection? Do you test all your goods
A5: Yes, 100% test. It integrates R&D, casting, production,
processing, painting, assembly, testing, sales and after-sales
service, and strict quality requirements, according to GB, ASME,
API, DIN standard, and we have gained ISO9001;2008, CE, and TUV
|Q6: Could I customize special request valve or new design products?|
A6: We have own R&D team and more than 70 researchers and
engineers. Can give you the best support on quality management and
techniques, meet your different needs.
|Q7: How does your factory do regarding quality control?|
A7: Quality is priority. Valve always attach great importance to
quality controlling from the very beginning to the very end. Our
factory has gained ISO9001;2008, CE, TUV, authentication.
1. Product inspection and classificationProducts must pass the
inspection of the production factory quality department before
leaving the factory.Product inspection is divided into factory
inspection and type inspection.
2 type testIn any of the following cases, type test shall be
A. Trial production and verification of new or old products
transferred to the factory.
B. After production, when the product structure, material and
process are greatly changed, which may affect the product
C. In normal production, it shall be carried out every six months.
D. When production resumes after a long period of suspension.
E. When there is a big difference between the factory inspection
result and the last type test result.
F. When the requirements of type test are put forward by the
national quality supervision agency.
3. Product sampling inspection rules
1). Shape and position of end reinforcement ringSampling inspection
shall be conducted once a month. Each sampling inspection shall be
conducted on two products of one specification and one type for
X-ray inspection.If one of the test results is unqualified, two of
the products shall be selected for the second test.If there is
still one unqualified item, the product shall be judged as
2). Hydraulic testProducts with nominal inner diameter of less than
300mm shall be inspected quarterly, products with nominal inner
diameter of 350mm-1000mm shall be inspected semi-annually, and
products with nominal inner diameter of more than 1200mm shall be
inspected annually.Two products of one specification and one type
are selected for random inspection each time.If one of the test
results is unqualified, then two of the products will be selected
for the second test.If there is still one unqualified item, that
batch of products shall be judged as unqualified.
3). Vacuum resistanceEvery six months sampling inspection, each
sampling inspection choose a specification, a type of two
products.If one of the test results is unqualified, two of the
products will be taken out for reinspection.If there is still one
unqualified item, that batch of products shall be judged as
4) displacement performanceSample inspection for each specification
in each batch.Two products are extracted from each specification
for displacement performance test.If one of the test results is
unqualified, two of the products will be taken out for
reinspection.If there is still one unqualified item, that batch of
products shall be judged as unqualified.
5) physical properties of rubberAging performance shall be
inspected quarterly and other performance shall be inspected
monthly.One rubber material is extracted at a time and the
specified items are inspected.If one of them is unqualified, double
samples should be taken to reinspect the item.If there is still one
piece unqualified, the batch of rubber shall be judged as
6). Viscosity and strengthEvery six months, two samples are taken
from products with nominal inner diameter of more than 100mm for
testing.If one of the test results is unqualified, two more samples
shall be taken from the batch for retesting.If there is still one
unqualified item, the batch of such products shall be judged as
7). Water quality inspectionUnder normal production conditions,
check once a year, but when there is a change in the rubber
formula, should be ready to send rubber samples for inspection.One
rubber material is extracted at a time and inspected according to
the items specified in GB/T5749 and GB/T17219.If the test result is
unqualified, two samples from the batch of rubber shall be
retested.If there is still one unqualified product, the products