系列L7
在线可检测/可维修
双止回防回流阀
通径：DN20和DN25
SERIES L7
In-Line Testable/Serviceable
Dual Check Backflow Preventers
Sizes: 3/4" and 1" (19, 25mm)
说明
DESCRIPTION
对于要求在线可检测和可维修双止回防回流阀的住宅防污染应用，这是一个理想的解决方案。
The ideal solution for residential containment
applications that require in-line testable and serviceable dual check
backflow preventers.
标准
STANDARDS
 通过美国国家标准化组织(ANSI)和美国卫生工程师协会(ASSE)标准1024的检测和认证。
Tested and certified to meet ANSI/ASSE Standard
1024.
重要：咨询有关主管部门，了解当地有关安装的具体规定。
Important: Inquire with governing authorities
for local installation requirements.
规格说明
SPECIFICATIONS
这种双止回防回流阀应该按照美国国家标准化组织(ASSE)标准1024进行设计。它应该是青铜阀体，配置顶部和底部塑料止回阀总成。这种双止回阀应该具有三个塞式检测端口，应该能够进行在线检测。双止回阀应该具有两个用于在线维修的、安装在顶部的盖子。止回阀总成设计不应该在水路内放置螺丝，水路全程应该是全引导的。这种双止回阀应该是美国瓦茨调节阀公司系列L7。（请选择最适合的型号。）
The dual check backflow preventer shall be designed
under the ASSE Standard 1024. It shall be bronze-bodied with top and bottom
guided plastic check assemblies. The dual check shall have three plugged
test ports and shall be capable of being tested in-line. Dual check shall
have two top-mounted covers for in-line service. Check assembly shall
be designed without screws located within the waterway and shall be fully
guided throughout its range of travel. Dual check shall be Watts Regulator
Company's Series L7. (Please select the model best suited to your application.)
可提供的产品
PRODUCT AVAILABILITIES
系列L7：可提供的进口连接 - 类型，可提供的订购编号、通径
Series L7: Inlet Connections - Types available,
ordering code, sizes available
连接类型
Connection
Type |
连接编号
Connection
Code |
可提供的通径
Sizes Available |
英寸
inches |
毫米
mm |
美国标准管
内螺纹
National Pipe
Thread Female |
2 |
3/4, 1 |
19,25 |
美国标准管
外螺纹
National Pipe
Thread Male |
3 |
3/4, 1 |
19,25 |
仪表内螺纹
Meter Thread Female |
4 |
3/4, 1 |
19,25 |
仪表外螺纹
Meter Thread Male |
5 |
3/4, 1 |
19,25 |
压紧内连接
Pack Joint Female |
6 |
3/4, 1 |
19,25 |
压紧外连接
Pack Joint Male |
7 |
3/4, 1 |
19,25 |
内焊接
Female Solder |
8 |
3/4, 1 |
19,25 |
外焊接
Male Solder |
9 |
3/4, 1 |
19,25 |
内仪表螺纹
（旋转）
Female Meter Thread (Swivel) |
10 |
3/4, 1 |
19,25 |
外软管螺纹
Male Hose Thread |
11 |
3/4, 1 |
19, 25 |
内软管螺纹
Female Hose Thread |
12 |
3/4, 1 |
19, 25 |
系列L7：可提供的出口连接 - 类型，可提供的订购编号、通径
Series L7: Outlet Connections - Types available,
ordering code, sizes available |
美国标准管
外螺纹
National Pipe
Thread Male |
2 |
3/4, 1 |
19, 25 |
仪表内螺纹
Meter Thread Female |
4 |
3/4, 1 |
19, 25 |
内软管螺纹
Female Hose Thread |
12 |
3/4 |
19 |
参阅第10和11页的“如何订购”
可提供所有进口/出口类型和通径的接头（U）连接。
See "How To Order" on pages 10,
11
Union (U) Connections available on all inlet/outlet types and sizes. |
|
|
材料
MATERIALS
铸青铜阀体，塑料止回总成，硅树脂阀瓣和不锈钢弹簧。
Cast bronze body, plastic check assemblies, silicone
discs and stainless steel springs.
压力 / 温度
PRESSURE / TEMPERATURE
最大压力：175 psi (12 bars).
最小压力： 10 psi (69 kPa).
工作温度：持续温度0.6oC to 60oC；间歇温度82.2oC
Maximum pressure: 175 psi (12 bars).
Minimum pressure: 10 psi (69 kPa).
Working temperature: 33oF to 140oF sustained;
intermittent to 180oF (0.6oC to 60oC
sustained; intermittent to 82.2oC).
* 订购配置仪表螺纹连接的型号7阀门时，要确定订购的仪表连接比仪表通径大一个等级。
* When ordering No. 7 Valves with Meter
Thread Connections be sure to order the meter connections one size
larger than meter.
例如：
Examples:
对于DN15和DN16水表，订购DN20仪表螺纹连接。
对于DN16和DN20的水表，订购DN25的水表螺纹连接。
对于DN25水表，订购DN32水表螺纹连接。
For 1/2"(13mm)
and 5/8"(16mm) water meter; order 3/4"(19mm)
meter thread connection.
For 5/8"(16mm) and 3/4"(19mm)
water meter; order 1"(25mm)meter thread connection.
For 1"(25mm) water meter; order 11/4"(32mm)
meter thread connection. |
通径
Size |
A |
B |
E |
F |
重量
Weight |
英寸
inches |
毫米
mm |
英寸
inches |
毫米
mm |
英寸
inches |
毫米
mm |
英寸
inches |
毫米
mm |
英寸
inches |
毫米
mm |
磅
lbs. |
公斤
kgs. |
| 3/4 |
19 |
53/4 |
146 |
25/8 |
67 |
47/8 |
124 |
3/4 |
19 |
2.3 |
1.0 |
| 1 |
25 |
53/4 |
146 |
25/8 |
67 |
47/8 |
124 |
1 |
25 |
2.3 |
1.0 |
|
