valve manufacturer
china valve manufacturer
gate valve
  Contact Us:
  check valve
  Tel: 86 - 574 - 8720 0715
  Fax: 86 - 574 - 5670 8367
How to order
Care should be taken to select the most suitable valves for your service(s). Exact specification of each valve should be made to avoid possible ambiguity. When requesting quotations and/or ordering the product a fully adequate description should be made.
state quantity, figure number and size for each valve you wish to order. see individual valve catalog pages (download from first page of website) for specific or special product designations.
How many to order
NVF valves are decimal packed for your convenience in handling, shipping and stock-keeping. Number in master carton varies with item.
selecting the Valve size
Nominal size of the pipeline into which the valve will be placed must be determined.
Valve Material
The following facts should be considered in determining the correct valve material:
   · the medium or media which will be controlled
   · the temperature range of the line medium (media)
   · the pressure range to which the valve will be subjected
   · possible atmospheric conditions which may affect the valve
   · possible extraordinary stresses to which the valve will be subjected
   · safety standards and/or piping codes which must be met
Type of Valve
What is the control function of the valve? Each valve configuration has been developed to perform certain control functions. Do not expect one type of valve to perform all the valving jobs in a system.
Pressure-Temperature Ratings
Please pay careful attention that the pressure-temperature ratings of a particular valve are in keeping with the requirements of the service. Pay especially careful attention to the packing and gasket materials as this may limit the rating as is the case with PTFE used as the standard in Ningfa valves. specify alternative packing and/or gasket materials as necessary to meet or exceed your service requirements.
Valve and Connections
Considerations as to pipeline integrity, future maintenance, corrosion factors, field assembly, weight and safety should be given in determining the method of connecting the valve in the pipeline.
Method of Operation
The means by which the valve is operated as supplied are shown for the valves in this catalog. Many optional operating devices are regularly supplied by Ningfa.
Ordering the Valve
Please state the following information when ordering a valve in order to avoid unnecessary delays and to insure we supply you with the valve you have requested.
   1. Valve size
   2. Pressure boundary material - metallurgy of the castings and components.
   3. Type of valve – butterfly valve, globe valve, check valve, gate valve, etc.
   4. End connection including wall thickness of connecting pipe if weld end and any special flange facings or finishes
   5. Any material deviations from standard - packing, gasket, bolting, etc.
   6. Any accessories - acid shield, locking devices, chain operation, etc.
   7. Manual or power actuators, please include details of requirements.
   8. For convenience in ordering, specify by figure number. Contact Ningfa for additional assistance in valve selection.
The symbols meaning of the valve model
① ② ③ ④ ⑤ — ⑥
1. Valve type: Butterfly valve D, food sanitary butterfly WD;Gate valve Z; Check valve H
2. Valve operation: Worm gear actuator 3 ; Pneumatic actuator 6; Electric actuator 9; Manual drive omitted;
3. Valve connection type: Butt-clamping type 7;
4. Valve construction form: Perpendicular sheet 1;
5. sealing pair materials: Butadiene nitrile rubber-Nodular iron J, fluoride rubber-ductile iron JF, Butadiene nitrile rubber-stainless steel JH, fluoride rubber-stainless steel JHF, sanitary rubber-stainless steel J(WD kind);
6. Nominal pressure: MPa.
[ Back ]
Home | Profile | Quality | Products | Technical Support | Order guide | Contact us | Site map
Tel:+86-574-8720-0715    Fax:+86-574-8386-6606
NVF was found in 1959, we are professional in manufacturing forged steel and cast steel valve, gate valve, globe valve, check valve, ball valve, butterfly valve, plug valve and so on.