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  流量计算(2)
Flow Calculations (2)

美国太平洋阀门

阀座端口流速计算
Calculating Seat Port Velocity

  下列公式可以用来计算任何阀门的阀座流速:
  The following formulas can be used to calculate seat port
velocity in any valve:

流量(磅/小时): 流速: (英尺/秒)=
F()2
25A
Flow (lbs/hr): vel: (fps) =
F()2
25A
流量(加仑/分钟): 流速: (英尺/秒)=
0.32Q
A
Flow (GPM): vel: (fps) =
0.32Q
A

 

在此:
Where:
F = 流量(磅/小时)
F = flow (lbs/hr)
= 比容积的平方根
= square root of specific volume
A = 阀座端口面积 (英寸2)
A = seat port area (in2)
Q = 流量 (加仑/分钟)
Q = flow (gpm)

例:
  DN300型号58809 (压力等级Class 900)止回阀,流体介质为温度500 oF,压力200 PSIG的蒸汽,流速为90,000磅/小时,求阀座端口的流速?
Example:
  What is the seat port velocity in a 12" Figure 58809 (Class 900) check valve with a flow rate of 90,000 lbs/hr of steam at 500 oF and 200 PSIG?

解:
  从蒸汽表得为1.61,从阀座端口面积表A得阀座端口面积为78.5英寸2
Answer:
  From the steam tables is 1.61, and from the seat port area table A is 78.5 in2.

流速: (英尺/秒)=
F()2
25A
=
90,000 (1.61)2
25 (78.5)
= 118.8 英尺/秒
Vel (fps) =
F()2
25A
=
90,000 (1.61)2
25 (78.5)
= 118.8 fps

例:
  DN300型号180 (压力等级150)旋启式止回阀,流体介质为温度500oF,压力200 PSIG的蒸汽,流速为90,000磅/小时,求阀座端口流速?
Example:
  What is the seat port velocity in a 12" Figure 180 (Class 150) Swing Check Valve with a flow rate of 90,000 lbs/hr of steam at 500oF and 200 PSIG?

解:
  查表得为1.61,A为 113.1英寸3.
Answer:
  From the tables is 1.61 and A is 113.1 in3.

流速: (英尺/秒)=
F()2
25A
=
90,000 (1.61)2
25 (113.1)
= 82.5英尺/秒
Vel (fps) =
F()2
25A
=
90,000 (1.61)2
25 (113.1)
= 82.5 fps

局限性
LIMITATIONS

  流速公式在下列条件下无效:
  Velocity formulas are not valid under the following conditions:

  1. 对于可压缩性流体,如果压降超过进口压力的一半。
    For compressible fluids, where pressure drop exceeds half the inlet pressure.
  2. 对于不可压缩性流体,如果压降产生空穴或闪蒸。
    For non-compressible fluids, where pressure drop causes cavitation or flashing.
  3. 对于双相流体,如蒸汽-水混合流体。
    For dual-phase flow such as steam-water mixtures.

注意
NOTE

  在确定止回阀通径时,最适宜的工作流速应该位于这些范围内:
  When determining sizing for check valves, the optimum operating velocities should fall within these ranges:

BB旋启式止回阀:55 至115或135至240
BB截止止回阀:40 至120
PS提升式阀瓣止回阀:55至200
PSY形止回阀:148 至200
BB Swing Check Valves - 55 to 115 or 135 to 240
BB Stop Check Valves - 40 to 120
PS Tilt Disc Check Valves - 55 to 200
PS Stop Check Valves - 40 to 180
PS Y- Stop Check Valves - 148 to 200

 
阀座端口面积“A”(英寸2)
适用于螺栓阀帽阀门
SEAT PORT AREA "A" FOR BOLTED
BONNET VALVES (in2)
阀门通径
Valve Size
压力等级
Pressure Class
150 300 600 900 1500
11/2
2
21/2
3
4
6
8
10
12
14
16
18
20
24
30
36
1.8
3.1
4.9
7.1
12.6
28.3
50.3
78.5
113.1
137.9
182.7
233.7
291.0
424.5
671.9
969.0
1.8
3.1
4.9
7.1
12.6
28.3
50.3
78.5
113.1
137.9
182.7
227.0
283.5
424.5
672.0
942.0
1.8
3.1

7.1
12.6
28.3
48.7
74.7
108.4
130.2
170.9
213.8
261.6
380.1
590.9
851.2
1.8
3.1
4.9
6.5
11.8
26.0
44.2
71.0
100.0
117.9





1.5
2.8
4.0
6.0
10.3
22.7
38.5
60.0
84.5
101.6





 

阀座端口面积(英寸2)
适用于压力密封闸阀,截止阀,提升式阀瓣止回阀
SEAT PORT AREA FOR PRESSURE SEAL GATE,
GLOBE, TILT DISC CHECK VALVES (in2)

阀门通径
Valve Size
压力等级
Pressure Class
600 900 1500 2500
21/2
3
4
6
8
10
12
14
16
18
20
24
5.4
5.4
9.6
23.2
39.9
61.0
88.7


173.8

310.25
5.9
5.9
10.3
21.7
37.7
58.4
80.5
97.2
125.2
156.7
198.0
287.3
3.3
4.9
8.3
18.9
31.9
48.7
69.0
82.5
108.4
137.9
170.9
247.5
2.4
3.6
5.9
12.6
21.7
34.5
47.2
58.2
76.6
97.2
117.9
170.9

 

阀座端口面积(英寸2)
适用于压力密封Y形截止阀
SEAT PORT AREA FOR PRESSURE SEAL Y-GLOBE
VALVES (in2)

阀门通径
Valve Size
压力等级
Pressure Class
900 1500 2500
8
10
12
14
16
18
20
24
39.9
61.9
86.6
86.6
135.4
135.4
198.1
302.6
39.9
61.9
86.6
86.6
135.4
135.4
198.1
302.6
27.2
42.8
60.1
86.6
86.6
135.4
135.4
198.1
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