6.SPECIFICATIONS
Ball Valves and accessories
SPECIFICATION FOR uPVC BALL VALVES
1.0General
A ball valve is a valve that opens by turning a handle attached to a ball inside the valve. The
ball has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur (valve is in open position). When the valve is clod, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you "e" the open position of the valve.
1.1Ball valves shall compri of a body on which head cap, handle, stem & ball
asmbly etc. with at & stem O-ring mounted.
1.2Ball valves shall provide leak free tight closure (complete– stop) of water flow
through the valve in the clod position.
1.3During operation at & stem & ball asmbly is moved causing the water to flowing
through the valve.
1.4All components shall be of “water works” standard and shall be of a well proven
robust design and manufacture and shall be suitable for drinking water.
1.5All non-metallic materials shall be listed in current “water fittings and materials
directory” and shall be suitable for drinking water.
2.0Specification
2.1 General
宫阙读音1.Body parts shall be uPVC & shall conform to EN 1452-1
2.Appearance
When viewed without magnification, the internal and external surfaces of
valves and ancillaries shall be smooth, clean and free from scoring,
cavities and other surface defects to an extent that would prevent
conformity to this standard. Each end shall be square to its axis.
3.Colour
The colour of injection- moulded valve bodies and ancillaries in PVC-U shall
be grey throughout the wall. The colour of ancillaries made from pipe shall
be grey, blue or cream throughout the wall. For above-ground application,
cream ancillaries shall not be ud.
4.Opacity
The wall of the valve shall be opaque and shall not transmit more than 0.2%
of visible light when measured in accordance with EN 578. This requirement
does not apply to cream ancillaries
5.Nominal dimensions
The nominal diameter(s), of a valve and ancillaries shall correspond to, and
be designated by, the nominal outside diameter(s) of the pipe(s) for which
they are designed.
6.Chemical Characteristics
The chemical characteristics shall conform to tho required for pipes by EN
1452- 2:1999
2.2Applicable Standards
The Ball valves shall comply with BS EN 1452-4:2000 in every respect unless otherwi stated in the specifications.
2.3 Markings on the body
Ball valves shall be legibly and indelibly marked with the following, by embossing or
engraving integrally during the process of manufacturing and shall comply with
ASTM F 1970
1.Trade name of the product / Identification mark
2.BS or other equivalent standards
3.The nominal size and direction of flow
4.Nominal pressure and the temperature for which the pressure is applicable
5.Material designation
2.3.1 Additional Marking
Valves conforming to this standard, which conform also to other standard(s) may be additionally marked with minimum required marking in accordance with relevant standards. Documentary proof shall be provided for third party certificates.紫菜寿司
人参的雅称2.4 Size
Sizes of the valves shall be as stated in the Bill of Quantities枣花蜂蜜
2.5 Valve Components
Type Description
Item Material
01Body uPVC Unplasticized Polyvinyl Chloride
02 Ball & stem uPVC Unplasticized Polyvinyl Chloride
03 Sealing Seat PTEE Poly Tetra Fluoro Ethylene (Teflon)
04 Handle ABS Acrylonitrile-Butadiene–Styrene Copolymer
05 Handle cap ABS Acrylonitrile-Butadiene–Styrene Copolymer
06 O ring EPDM EPT Rubber - Elastomeric product Ethylene
Propylene Dyene Monomer
Composition of materials will be tested to verify the requirements in standards.
2.6Construction of valve
1.Body, head and ball and stem
Injection molded and other methods of manufacture mentioned in the relevant
standards of this specification are acceptable, if they satisfy other conditions included
in the specifications.
Characteristics
2. Geometrical
Dimension shall be accordance with Pr EN 496 as specified in BS EN 1452-4-2000.
3.Threads
Inlet & outlet threads shall be female BS pipe parallel threads of the nominal size as the valve and in compliance with BS 21.
4.Seat
Seat shall be of PTEE and shall conform to relevant BS or equivalent water work standards.
5.O- rings
Shall be of EPDM and shall conform to BS EN 681-1; 1996 or ISO 4633; 2002.
2.7 Testing
List of Tests
The list of tests carried out on the samples submitted with the offer and samples
drawn from the delivered lots shall be in accordance with relevant BS or other
standards.
2.7.1 Seat Test
Every Ball Valve in the clod position shall show no leakage when subjected to
an internal hydrostatic pressure of 15 bar.
2.7.2
Body
梁园月Test
In the open position and with the outlet aled, shall be capable of withstanding
without leakage an internally applied hydrostatic pressure of 15 bar.
Extracts from EN 1452-4: 1999, Table 10-Endurance properties and Table 12-
Conditions for at and packing test is shown elwhere in this specification.
2.8List of tests and standards requirements are as follows.
No Test Requirement
in
Standards
1 Appearance The valve shall be homogeneous throughout and free of
草木樨
visible crack, holes, foreign inclusions or other defects as
specified in ASTM D 2466-06
2 Dimension Sealing Threads gauge correctly to BS ISO 7.1,
狗猫Thread length and other dimensions & tolerance is
compliant to ASTM D 2466 - 06
3 1000 Hrs Sustained
Pressure Test The test temperature between 15°C and 25°C with tolerance of ± 2C°, 1000 Hrs, No Leaking or crack in compliance with ASTM F 1970
4 Sealing Test 1.
5 x PN, temperature between 15°C and 25°C with宿多音字
tolerance of ± 2C°, Sustained for 15 Seconds, No leaking.
2.9Full details of the vales should be given in schedule of particulars.
2.10Some of the salient features of the specifications are summarized above to furnish a
quick reference. The tenderers are under obligations to refer the whole or relevant
parts of the standards specified in their entirety prior to perfecting their tender
documents, and will be deemed to have done so during the tendering stage.
Extracts from EN 1452-4 : 1999
Table 10-Endurance properties
Test parameters Characteristic Requirement
1)
parameter value Test method Endurance No leakage or fracture during test period Fluid inside
internal pressure
flow velocity
Tightening of gland package
Ambient temperature
Number of test pieces
Duration Water Equal to PN 1 m/s Allowed (15 ±5) ºC to (25± 5) ºC Shall conform to ENV 1452-7 1000 cycles EN 28659 1) Directly after this endurance test the test pieces shall be tested in accordance with at and packing test
Table 12- Conditions for at and packing test
Test parameters
Characteristic Requirement
Parameter Value
Test method Seat
Leak tightness:
valve clod
Packing Leak tightness:
valve open No leakage during the test period Fluid inside Fluid out side Internal pressure Conditioning period Ambient temperature Test period Water Air 1.5 x [PN] 1)
1h
(15 ± 5)º C to (25 ± 5) º C
1 min
Method B of EN917: 1997 1) Maximum test pressure ([PN] +5) bar.
