8/12/2019 Clasar Tech
1/2
nl
* Please select according to the application spec clasar en.doc
page 1/22 rue du Marais 80400 HAM - France
Tlphone +33(0)3 23 8143 00 - Fax +33(0)3 23 81 18 69SAPAG S.A.
au capital de 66 333 000 F - Sige social : avenue Brossolette -
59280 Armentires (France)
RCS Lille 612 044 339 - SIRET 612 044 339 001 92 - NAF 291 F -
TVA FR 47 612 044 339www.sapag-valves.com -
[email protected]
CLASAR NON RETURN VALVE DN 80 TO DN 1800 mmTYPICAL
SPECIFICATION
A. GENERAL SPECIFICATIONA.1 Non-return valves shall be non-slam
type (high dynamic answer) in order to
prevent the generation of secondary transient events (water
hammers) whenpumps are suddenly stopped. The valves shall be of the
spring operatednozzle type with annulus shaped water ways.
A.2 Referring to Dynamic answer performances, all non return
valves offered shallprovide a maximum reverse velocity of the water
column of 0.10 m/s against adeceleration of water column of 7 m /
s2.
A.3 Dynamic answer performance curves shall be provided to the
engineer forapproval (Reverse velocity against deceleration of
water column). These curvesshall be the result of tests carried out
by a recognised internationalindependent laboratory such as Delft
laboratory.
A.4 Valves shall be Wafer type with short face to face
dimensions for DN 500 mm
and below and double-flanged type for DN 600 mm and above.
A.5 Valves working pressure and flange drillings shall be in
full compliance withISO PN10, 16, 20, 25, 40, 50*(Bars).
A.6 Every single valve shall undergo hydraulic tests as per ISO
5208 standard,test certificates shall be submitted for
approval.
A.7 Manufacturer shall be ISO 9001 approved on its quality
system.
A.8 Manufacturers shall have of minimum 10 years of experience
in the field.Relative Job References shall be submitted for
approval.
8/12/2019 Clasar Tech
2/2
nl
* Please select according to the application spec clasar en.doc
page 2/22 rue du Marais 80400 HAM - France
Tlphone +33(0)3 23 8143 00 - Fax +33(0)3 23 81 18 69SAPAG S.A.
au capital de 66 333 000 F - Sige social : avenue Brossolette -
59280 Armentires (France)
RCS Lille 612 044 339 - SIRET 612 044 339 001 92 - NAF 291 F -
TVA FR 47 612 044 339www.sapag-valves.com -
[email protected]
B. VALVE BODYB.1 Body shall be made of ductile iron grade 400.15
minimum for fresh water,
Ni-resist ductile Iron type D2.B for sea water or stainless
steel grade 316 forcritical applications.
B.2 The body shall be cast in one-piece, with profiled
concentric rings supportedby spacers. This design shall ensure a
good hydraulic profile (separated andconcentric fluid circulation)
and a prompt recovery of the water flow.
C. SEALING ASSEMBLY OBTURATOR:C.1 The sealing assembly
(obturator) shall be made in one-piece, free to move
longitudinally with an arrangement of concentric rings supported
by spacers.The obturator shall be guided longitudinally with a
spring.
C.2 The sealing assembly (obturator) shall be made of
polyurethane (Ureflex orequivalent) with a maximum density of 1.1
in order to minimise the inertia ofthe moving element and increase
the dynamic performances.
D. SPRINGD.1. Spring shall be made of stainless steel grade 304
(minimum) for fresh water
applications. For sea water or critical applications, the spring
shall be made inINCONEL X750.
E. MARKINGE.1. Valves shall have marked in accordance with ISO
5209 standard :
size and maximum working temperature,Maximum working
pressure,Material of the body
Material of the springFigure number and year of
manufacturing.
