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. |