Dengfeng Mold (Hongkong) Co., Limited which registered on 2007 year
in Guangzhou, China , is a professional manufacturer of injection
moulds and plastic products , mainly concentrating on design and
manufacture of injection moulds for making plastic products, kinds
of plastic components for home and office appliances, and relevant
products with OEM service available all the times.
What you demand, we can do it for you!
http://www.df-mold.com can supply "one-stop" service with molds
opening, injection, painting, screen printing, assembly and nice
after-sales service in long term, with good quality and competitive
price. Until now, we built the good business relationship with Electrolux, Keytec, ERMAX, Makita, Philips. SAMSUNG, Checkpoint , MVS ,AURORA,RTC , NIKE , M.A.G .
1. Vent pipe, H pipe
(1)Drainage stretch top riser should set breather pipe, the top
should be set ventilation hair, when unconditional settings
breather pipe, should set the fill valve .
(2)Stretch top up without master roof vent pipe ( including
insulation ) shall not be less than 0.3m, and should be greater
than the maximum thickness of the snow, it was in the regular
activities of the roof, the roof vent pipe extending not less than
(3)Stretch top vent riser diameter is not less than the diameter of
(4)Ventilation and drainage standpipe riser should compartment
connected, connection method should give priority to using H- pipe
, H pipe and vent riser connection point should be higher than
sanitary ware edge 150mm.
(5) Vent pipe design
A: Breather pipe minimum diameter shall be determined as the
Breather pipe name
Drain pipe diameter mm
B: Vent length greater than 50m , its diameter should be the same
as sewage risers
(6)When two and two more sewage risers simultaneously with a vent
connected,the maximum one should be on the table at the riser
effluent to determine ventilation riser pipe diameter, and its
diameter should not be less than the rest stand any one sewage pipe
(7)H tube center distance dimensions: when diameter less than 110mm
,center distance is 180mm, when equal to 160mm diameter the center
distance is 220mm, ZHENYUN produced the H pipe center distance
adjustable range is: when the diameter is equal to 110 CM ,center
distance is 150mm-180mm, when equal to 160mm center distance is
(8)Using H- pipe ventilation combined system, its top and bottom
should be configured with H pipe tail pipe connected to waste water
(1)The necessity of setting expansion joints
PVC-U Spiral Silencing Pipe and Fittings compared to cast iron pipe larger coefficient of linear expansion,
about 0.07mm / m * ℃, the drain standpipe and a longer suspension
cross pipe ends should set a fixed support , and strictly prevent
the linear expansion accumulation in the piping system, expansion
joints shall be provided between the fixed support , or in lead
pipe rupture or leakage, or lead pipes produce significant bending.
(2)Setup requirements for expansion joints
A: When the story is less than or equal to 4m , the riser pipe
should be located on each floor an expansion joint ; when the story
is greater than 4m, should be determined according to the design
amount of stretching.
B: horizontal main pipe set horizontal expansion joints shall be
determined according to the design amount of stretching
C: Horizontal branch pipe section from confluence fittings to the
straight pipe riser more than 2m , the expansion joints should be
set , but the maximum distance between expansion joints shall not
exceed 4m; two expansion joints should be between a fixed support ,
in order to control the direction of pipeline expansion .
D: Piping expansion volume should not exceed the maximum allowable
amount of stretching expansion joints
Maximumexpansion amount allowed (mm)
Setting expansion joints should be located close to the water at
the confluence of accessories, riser pipe expansion joints should
be set close to the branch office access , try to make the branch
pipe connecting the riser displacements at a minimum , to ensure
that the system is working properly.
For more detailed information, you can visit our website: http://www.df-mold.com