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| DZR STRAIGHT STOP BALANCING VALVE |
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与Y形截止阀结构、球阀结构和旋塞阀结构平衡相比，ZWB555直线形截止阀结构平衡阀的独特功能,改善了流量测量的精确度，减少了压头损失. Unique for features of the ZWB555 straight pattern blobbed gives improved flow measurement accuracy and lower head loss  characteristics compared to "Y" pattern globes, all and plug style balancing valves.
DZR黄铜流量平衡阀ZWB555 DZR Brass Circuit Balancing Valves.
直线形截止阀结构，配置用于差压测量2个测试点·整体止动记忆
Straight Pattern Globe·Fitted with 2 Test Points for Differential Pressure Measurement · Integral Memory stop.
在温度79℃下，额定压力为124psi（当温度达到最高限度121℃时，额定压力为85psi）Rated 125 to 175° F(max.250° F at 85 psi)
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材料清单 MATERIAL LIST
部分 PART |
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| 1.阀体 Body |
抗脱锌金属 DZR Metal |
| 2.手轮 Hand wheel |
聚合物 Polymer |
| 3.阀杆,包括阀瓣 Stem including Disk |
抗脱锌金属 DZR Metal |
| 4.阀杆密封 Stem Seals |
三元乙丙橡胶 EPDM |
| 5.阀杆护圈 Stem Retainer |
黄铜 Brass |
| 6.测试点 Test Point |
型号631 Fig.631 |
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预置 Presetting
利用流量系数资料,可以将阀门预先设置到所要求的流量系数值:Using the flow coefficient information the valve can be pre-set to a given Cv value
逆时针方向旋转操作,直到所需要的设置点止,并且对准固定撞嘴.Operate counter clockwise until the required set position is aligned with the fixed stop.
不需要改变阀杆位置,拆卸手轮,重新配置止动记忆,并从上俯视使其对准顺时针方向一侧的固定撞嘴. Without changing the stem position  remove the and wheel and refit the memory stop aligned adjacent to the fixed stoop on the clockwise side when viewed from above.
重新装置手轮固定螺丝. Refit the hand wheel retaining screw.
阀门可以关闭并重新开启到预置的位置. The valve can be closed and re-opened to the pre-set position.
合金腐蚀,称为"脱锌现象",在50年代已经在阀门产品上有效根除,但是,由于当今在世界上一般生产的锻造和铸造阀门产品上,高锌合金的使用增加(通常被称为"黄铜"),现在这个问题又开始回潮.
De-alloying corrosion, known as "Dezincification" was effectively eradicated from valve products in the 1950's today. However, this problem has returned with the increased use of high-zinc alloys(commonly referred to as ' Yellow Brass')in forged and cast valves typically produced outside the United States.
脱锌现象有选择的从合金中去除锌元素,造成多孔、富铜结构，降低了机械强度。应用中的阀门出现脱锌现象的物理特征是;在产品表面出现粉状物质或矿物污点。作为标准，沃尔达青铜/黄铜平衡阀由“抗脱锌”材料制造，是一种优质和耐用的密封材料。
Dezincification selectively removes zinc from the alloy, leaving behind a porous, copper-rich structure that has little mechanical strength. The physical attributes of an in-service valve with Dezincification includes a white powdery substance or mineral stains on its exterior surface As standard WORLD bronze/brass balancing valves are made to be "Dezincification Resistant,"which is a seal of quality and longevity. |
/mm |
/g |
G |
DN |
A |
B |
C |
D |
Approx.W |
1/2 |
15 |
92.0 |
65.0 |
14.3 |
38.9 |
380 |
3/4 |
20 |
101.6 |
65.0 |
14.3 |
38.9 |
400 |
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