Cast Iron Air Compressor DN80 Pn16 Wafer Butterfly Type Swing Dual Plate Spring Tilting Disc Non Reture Check Valve

Under the leadership of the company's leaders, we have introduced a large number of talents and established a complete quality management system to ensure the quality of our Metal Seated Floating Ball Valve, Underground Fully Welded Ball Valve, Concentric Butterfly Valves. Honesty, service first, steady operation, pragmatic innovation is our company's enterprise tenet and we sincerely hope to cooperate with domestic and foreign merchants for mutual benefit. We firmly believe that long-term business success can only be rooted in integrity and enthusiasm. Cooperation, exchange and communication are not means, but a way of mutual benefit to create a virtuous business circle. Our company's integrity, strength and product quality have been recognized by the industry. We will warmly welcome you to become our business partner with our high-quality service. Friends from all walks of life are welcome to visit, guide and negotiate business.

  NSV Tilting disc wafer check valves, as check valve is opened when flow goes through one direction and closes at backflow

Thanks to the fast closure of this versatile valve, pump protection is one of its main applications. It is used for gases and liquids, bus it is not recommended when there are solids in suspension. The head drop is relatively low.

• Applicable Standard
  Design per.API594
  Face to face per API594
  Flange ends dimension ANSI B 16.5/ANSI B 16.47
  Final inspection tests to API598.

• Products Range
  Size: 2" ~ 20" (DN50 ~ DN500)
  Rating: ANSI 150lb-2500lb 
  Body Materials: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
  Trim: Per API 600

• Design Features:
  Quick closing system

  Stability at low and pulsating flow
  Moderate pressure drop

  Tight sealing of metal seat

  Seat contacts don’t occur until the disc is seated and closed

Structure Performance:

Tilting disc valves are designed with three eccentricities: 

• First eccentricity: it is the offset between the shaft and the seat plane. This eccentricity removes any interference of the seat with the shaft and therefore the seat has an integral and continuous construction both in the body and disc, and potential leakage can be avoided.

• Second eccentricity: it is the offset between the shaft and the disc diameter. This eccentricity works when reverse comes or normal flow pressure is so low than it can't make enough force to hold the closing torque caused by the weight of the disc.

• Third eccentricity: it is the angle of tilting of the seat plane with the normal plane of the pipe. This tilting reduce the stroke of the disc, therefore it could close faster at backflow.

Furthermore of geometry and weight of the disc, in same cases other elements can optimize the closing sequence. Springs can be used in order to increase the speed of the disc closure before reverse flow starts. In the other side, when reverse flow is a reality but the valve still not close at all a slow closure can avoid slam over the valve. There are several oleo-hydraulic damper systems.

In order to tighten the valve, springs and also counterweights assemble at the end of the shaft can be used.

Minimum work pressure provided by manufacturers should be take into account when selecting valves for low pressure applications, if not disc can be buffeted and in constant motion between the seat and partially open. This leads to seat damage and shaft wear. This effect is more important in swing check valves.

FAQ

1. Q:How can I get your company catalog?

A: For your reference, basic catalogue is same as "Download>E-Catalog” of homepage. If you need printed material or request more specific data like PQ material, please contact sales team.

2. Q:Does your company have any agent/distributor with the exception of China?

  A: At present,we have agent in Indonesia,Singapore,Canada,Mexico,Iraq,and welcome contact us if you would like to join us.

3. Q:Does "NSV" valves have supply to any value end user?

  A:Yes,,it just like PETROKIMIA GRESIK in Indonesia, BP Iraq,ESFAHAN MOBARAKEH STEEL In Iran etc.

4. Q: I want to be registered as your agency?

A: Defined inspection and manager’s approval shall be required for being registered as the company’s agency. For specific application method, please consult with sales team. If you are registered as the company’s agency, “Agency Certificate” will be issued.

5. Q:Are you manufacturer or trading company?

  A: We’re manufacturer,but our factory name is not named NSV due to we’re professional in promotion NSV brand with best service,and also have sold to many end user success.

The very strict modern company management system and advanced production technology guarantee our Cast Iron Air Compressor DN80 Pn16 Wafer Butterfly Type Swing Dual Plate Spring Tilting Disc Non Reture Check Valve always in top quality. We have established long-term product supply and demand and quality information feedback relationships with many companies. For taking time to browse our website and we would welcome any suggestions you may have that can help us to improve our site.