THINKTANK is the manufacturer of industrial valves, especially control valves, self-operated pressure regulators, safety valves, and high-performance butterfly valves. Based on over 30 years of our family group business in industrial valves, here I just simply list 10 steps to let you know the process of manufacturing, and how we control the quality before shipment.
Before that, I would like to let know, that so far China valves are still in the developing process, not like the
The USA or European market with really advanced technology. We have to admit this point, and when we clearly know our position, and how far we are from those international brands, we can do better and more solid advancements, and improve our weaknesses.
So it&#;s hard for us from the standardization part, not just to manage cost, raw material cost(need to stock much), but also for paper works. It&#;s a common weakness in Chinese factories, but over the last 10 years, we learn a lot from our customers. Appreciate them assisting us in progressing such fast.
Standardization means each part should be manufactured in accordance with customers&#; approved CAD drawing, and of course, the drawing should be in accordance with the valve design and manufacture standard, shell test standard, face-to-face dimension, leakage class, connection dimension, and so on. Reference MSS, API, ASME, BS, DIN, GB, JB standard.
Different types of industrial valves have different standards, you can find the corresponding standards in the following valves.

Disai are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

• Control valve: GB/T -, ASME B16.34

• Ball valve: GB/T , API 6D, API 608, BS, DIN 

• Butterfly valve: JB/T , API609, ASME B16.34, MSS SP-67, MSS SP-68

• Self-operated Pressure Regulator: JB/T -, ASME B16.34

• Gate valve: GB/T , ASME B16.34, API 6D, API 600, API602,API603, DIN 

• Globe valve: GB/T , ASME B16.34, API602, BS , DIN 

• Check valve: GB/T , GB/T , API 6D, API 594, API602,BS 

• Safety valve: GB/T -, API 520, API 526

10 Steps Let You Simply Know The Process Manufacturing of Industrial Valves

Step 1:  To Purchase Raw Materials

When our drawing, datasheet, and commercial offer get customers approved, we will send the Proforma Invoice to our customers and wait for them to sign back or release the contract for us. After the advance payment/deposit kicks into our account, we will start the procurement of raw materials for this case.

For industrial valves of raw materials, it has to consider various grades of steel casting body, forging steel
body, special alloy steel, and duplex steel material.

Step 2: Quality Control

All the raw materials are inspected by our quality control department before raw materials into the manufacturing process. Before the raw materials enter the warehouse, the steel casting, rods, forging materials, nuts & bolts, tubing, and piping, etc, all have checked the chemical composition, dimension inspection, and hardness test if necessary. If quality is passed, we will stamp a &#;PASSED&#; label on the parts.

Step 3: Machining

Through the issued the manufacturing procedure card to apply the raw materials from the warehouse supervisor for the machining workshop. The body, bonnet, seat, plug, etc are machined on CNC machines. after being machined our QA inspects and measures the dimensions again.

Step 4:  Process Inspect

After all the parts passed dimensionally and visually, the valve body, and the bonnet is transferred to the test bench for a hydrostatic test, in case there is zero leakage of the bonnet and body before assembly. If there is any leakage or drops of the test fluid from the body of the bonnet, the component must reject and send back to the foundries.

Step 5: Assembly Procedure

The qualified body and bonnet are transferred to the assembly area. In case of parts uniformity and interchangeability, the body and bonnet are drilled on the machine. In some projects, the valve seat and plug or other components need to be lapped before assembly. In other projects, the seat and plug should be lapping after assembly. To care transfer process, make sure components&#; surface has no scratches.

For more product assembly videos or test videos, please just feel free to click here.

Step 6: Test & Inspect Industrial Valves

After the complete assembly, we are going to transfer the valve to the hydrostatic bench for the shell
test, low-pressure test, and seat leakage test. Witness by QA colleague, in accordance with drawing to see if the result meets relevant standards. If qualified then transfer to the painting area.

Step 7: Painting or Finishing

Use a grinder or sander to make better surfaces and smooth finishing based on customers&#; requirements.
For carbon steel body is sprayed with one coat of corrosive resistant primer. Observe the surface and if any is uneven, use a high-temperature putty to make a better surface. The painting color number should be the same as the customer requested. If for corrosion environments, the coating thickness must according to the relevant standard.

Step 8: The Third Party Inspect & Project Record

After the test & inspection, painting, and functional test, the customers informed the third party to arrange the witness and inspection. And our quality assurance department records project name, tag number, model, process quality checks, furnace number, and all the details into our system.

Step 9: Packing

Commonly we use ply-wooden cases to packaging industrial valves. The catalog, manual book, and maintenance guidelines will be along with the goods if the customer needed.

Step 10: Shipment

Shipping mark, Packing list, Invoice, and other details the customer mentioned, we double-check with the
customer before shipment. After approval, the goods were finally dispatched and handled over to the forwarder.

Final Thought

We all know that a reliable industrial valve must go through a standardized manufacturing process to guarantee that each spare component is standard, hence maintaining the stability of the valve&#;s quality throughout assembly and operation. THINKTANK has over 30 years of expertise in the manufacturing of industrial valves, particularly control valves, and is headquartered in Taipei, Taiwan. We have adopted Japanese technology, constantly innovating, and have been developing more widely used control valve abilities.

Contact Us

In , so far we have replaced FLOWSERVE, FISHER, and SAMSON with our own brand THINKTANK brand in three projects in Middle-East Market. And provided OEM service for 7 new brands, hope you will be the next friend we meet.

Click here to see what customers&#; reviews of THINKTANK

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Gate Valve - Best/Worst Manufactures

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Gate Valve - Best/Worst Manufactures

Gate Valve - Best/Worst Manufactures

DJME80

(Mechanical)

(OP)

28 Jun 11 13:46

The company I work for is in the planning stages of installing some new package boilers.  We are going to make tie-ins to our feedwater system and want to get the best (most reliable/well built) gate valves we can find.  Does anyone have any experience with a particualarly good gate valve manufacturer?  Any direction of who's good and who to stay away from would be great help.  Thanks in advance!!

Replies continue below

For more gate valve manufacturers in usainformation, please contact us. We will provide professional answers.

Additional reading:
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RE: Gate Valve - Best/Worst Manufactures

micalbrch

(Mechanical)

28 Jun 11 15:21

Your question for good manufacturers is reasonable but not the opposite. This forum should not be used to blacklist certain manufactures. And keep in mind: Bad manufacturers do not exists because they cannot survive with only bad references.

RE: Gate Valve - Best/Worst Manufactures

DJME80

(Mechanical)

(OP)

28 Jun 11 15:53

I assure you there are bad manufactures.  There are a few manufactures (and I won't mention their names) that produce very poor quality valves.  We have vales that have lasted 30 years in this plant, and then we get valves from some manufactures that barely last 6 months. That's BAD!!!

RE: Gate Valve - Best/Worst Manufactures

gerhardl

(Mechanical)

28 Jun 11 16:59
DJME80, I agree with micalbrch. I would not on principle 'blacklist' or give bad marks for any producer, as there usually is a price difference between higher and lower quality, and a lower price and quality could be the right choice for the right circumstances.

You are however obviously after the high quality end, and wish good value over lifetime.

Wich brand and exact material and trim solution to select will depend also details on your process (process water, chemical composition, pressures, flow etc) but also availability on the market, and commonly used and recommended in your area.

(Please remember that this site represents products and people from all over the world, so it is not that easy to come out with a particular brand. At the moment we can only make a guess that you want US standard, but it could be JIS or EN or anything else. And why are you so sure you only want to evaluate gate valves?)

By asking possible suppliers for suggestion of brands and types with recommended alternatives for longest possible lifetime (not only cheapest buying price), with argumentation for construction details, and with references to long-term customers and installations you can contact, you ought to get both a qualified range to select from and data to set down on paper a technical/economical evaluation of  the different choices.

Good luck!  

DJME80, I agree with micalbrch. I would not on principle 'blacklist' or give bad marks for any producer, as there usually is a price difference between higher and lower quality, and a lower price and quality could be the right choice for the right circumstances.You are however obviously after the high quality end, and wish good value over lifetime.Wich brand and exact material and trim solution to select will depend also details on your process (process water, chemical composition, pressures, flow etc) but also availability on the market, and commonly used and recommended in your area.(Please remember that this site represents products and people from all over the world, so it is not that easy to come out with a particular brand. At the moment we can only make a guess that you want US standard, but it could be JIS or EN or anything else. And why are you so sure you only want to evaluate gate valves?)By asking possible suppliers for suggestion of brands and types with recommended alternatives for longest possible lifetime (not only cheapest buying price), with argumentation for construction details, and with references to long-term customers and installations you can contact, you ought to get both a qualified range to select from and data to set down on paper a technical/economical evaluation of the different choices.Good luck!

RE: Gate Valve - Best/Worst Manufactures

mridey

(Mechanical)

28 Jun 11 18:04

If you have gate valves that have been working fine for 30 years, then you have the answer to your own question; buy more of those valves!

Otherwise stick with the names you know, the "players" in the industry. Check Thomas Register, for starters.

RE: Gate Valve - Best/Worst Manufactures

stanier

(Mechanical)

29 Jun 11 23:03

Look for Shell approved manufacturers with manufacturing facilities you can inspect . Dont rely upon QA, do some QC. Anyone with a laser printer can give you a compliance certificate. If its that critical send in and inspectorate like Moody or LLoyds to check complliance. Seek witness tests.

It is hard call as many well respected manufacturers from yesteryear have been bought by investment companies. Worse still they rebadge dodgy brothers stuff from the Far East.Look for Shell approved manufacturers with manufacturing facilities you can inspect . Dont rely upon QA, do some QC. Anyone with a laser printer can give you a compliance certificate. If its that critical send in and inspectorate like Moody or LLoyds to check complliance. Seek witness tests.

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/

RE: Gate Valve - Best/Worst Manufactures

rconner

(Civil/Environmental)

30 Jun 11 18:22

There have been some very good responses on this thread. All I would personally say about this specific matter is that (while I guess it is quite easy to do so based on some comfort of isolationism or interpretation of ethics/ altruism) it is, and has always been, dangerous to assume that "bad" and for that matter evil are not out there in this world. From this standpoint the OP has asked some very good questions. A couple quotes, from folks much smarter than I long ago but I think still applicable, immediately come to mind:

"All that is necessary for the triumph of evil is that good men do nothing."
Edmund Burke

"Silence is the virtue of fools."
Sir Francis Bacon

"There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey."
John Ruskin

While I guess there are hundreds of other similar quotes from history and to similar ends, I guess in a low bid or initial material cost only bean-counting atmosphere, the last concept is perhaps particularly pervasive.

[I apologize for the uni-gender nature of the words used in some quotes, but I guess it was a sign of the times in which they were made.]

 

RE: Gate Valve - Best/Worst Manufactures

steamdog

(Chemical)

7 Jul 11 12:53

I think there are more good manufacturer's than bad, most try to put out a good product.  For this reason I would go with the people who you trust and you know will back up the product should there be a problem.

RE: Gate Valve - Best/Worst Manufactures

rconner

(Civil/Environmental)

8 Jul 11 16:17

Quality, dependability, and service (I guess best if reasonably prompt and understandable), at a low enough price

"Aye, there's the rub!"   William Shakespeare

RE: Gate Valve - Best/Worst Manufactures

lallina50

(Mechanical)

12 Jul 11 16:32

Hi I am looking for manufacturing Valves companies in Norway - material Duplex, monel, Inconel? can you help?

RE: Gate Valve - Best/Worst Manufactures

gerhardl

(Mechanical)

13 Jul 11 15:18
To lallina: I suggest you put this question out in a separate string and add sizes , types and pressure classes to your question.

There are many suppliers/importers of valves with exotic material in Norway, but only a few producers, please remember Norway has only 5 mill. inhabitants!

For common offshore use valves are normally imported,

To lallina: I suggest you put this question out in a separate string and add sizes , types and pressure classes to your question.There are many suppliers/importers of valves with exotic material in Norway, but only a few producers, please remember Norway has only 5 mill. inhabitants!For common offshore use valves are normally imported,

RE: Gate Valve - Best/Worst Manufactures

hacksaw

(Mechanical)

16 Jul 11 09:57

gee, I thought most valve manufactures were as smart as their customers, especially when price is the controlling objective...
with inspections, material certs, testing compliance taking a back seat...
 

RE: Gate Valve - Best/Worst Manufactures

ricklts

(Mechanical)

1 Aug 11 13:22

I noticed that very few actual names were given.  Try Bel Valves in the UK.   

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