-12-28 19:52:07
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NRS means Non-Rising Stem. OS&Y means Outside Stem and Yoke. In an NRS gate valve, the stem turns to open and close the gate, but the stem does not move up or down as it turns. In an OS&Y valve, as the stem turns, it moves into or out of the valve, which also moves the gate to open or seal the valve.
UL / FM OS&Y Resilient Seated Gate Valves (2&#;-24&#;) are UL / FM Approved at the highest rated pressures in the industry.
Complies with AWWA C515 Standard
Heavy duty handwheel and attachment nut
High quality graphite stem seal
NPT plug on body
Flanges to ANSI B16 1 Class125 (Other flange types available upon
request)
UL Listed for 2&#;-24&#;
FM Approved for 2&#;-16&#;
Working pressure:
300PSI for 2&#;-12 &#;
250PSI for 14&#;-16&#;-18&#;250PSI for 14&#;-16&#;-18&#;200PSI for 20&#;-24&#;
Working temperature:
42° F &#; 180° F
Corrosion protection:
Fusion Bonded Epoxy Coated Interior and Exterior to AWWA C550 Standard
Installation:
Valves installed in horizontal piping systems should have the stems
oriented vertically
Valves installed in vertical piping systems should have the stems
oriented horizontally
&#; Testing Conform to AWWA C515
&#; UL/FM approval
No.
Part Name
Material
1
Gasket
C
2
Bonnet
ASTM A536 65-45-12
3
Packing
PTFE
4
Wedge
ASTM A536 65-45-12+EPDM
5
Body
ASTM A536 65-45-12
6
Sealing ring
EPDM
7
Bolt
ANSI
8
Seal gasket
EPDM
9
Gland
ASTM A536 65-45-12
10
Nut
ANSI 304
11
Flat Washer
ANSI
12
Bolt
ANSI
13
Spring Washer
ANSI
14
Handwheel
ASTM A536 65-45-12
15
Lock nut
ASTM B148 C
16
Locking screw
ANSI 304
17
Stem
ANSI 304
18
Stem Nut
ASTM B148 C
19
Gasket
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C
20
Skeleton
ASTM A536 65-45-12
21
Plug Screw
ASTM B62
22
Wedge Nut
ASTM B148 C
23
Pin
ANSI 304
24
Sealing ring
EPDM
Dimensions data (mm)
Size
2½"
3"
4"
5"
6"
8"
10"
12"
Dn
65
80
100
125
150
200
250
300
D
190.5
203.2
228.6
254
266.7
292.1
330.2
355.6
H
357
411
443
536
595
739
881
ΦD1
139.5
152.5
190.5
216
241.5
298.5
362
432
n-d
4-19
4-19
8-19
8-22
8-22
8-22
12-25
12-25
Gate valves are essential components in pipeline systems, used to control the flow of fluid by opening or closing a gate mechanism. Among the various types of gate valves available, the two most common are the OS&Y (Outside Screw and Yoke) gate valve and the NRS (Non-Rising Stem) gate valve. While both valves serve the same purpose, they differ significantly in their design, construction, and application. In this article, we will explore the differences between OS&Y and NRS gate valves in detail.
The most noticeable difference between the two types of gate valves is in their design and construction. OS&Y gate valves feature a threaded stem that connects the gate to the actuator at the top of the valve. This stem is visible on the exterior of the valve and moves in an up-and-down motion when the valve is opened or closed. The yoke of the valve holds the stem in place and allows it to move smoothly.
On the other hand, NRS gate valves have a stem that is connected to the gate mechanism internally, meaning the stem does not protrude from the valve body. This design is more compact and is often preferred in applications where space is limited.
The choice between an OS&Y and NRS gate valve often comes down to the specific application in which the valve will be used. OS&Y valves are commonly used in applications that require frequent maintenance, such as in water treatment plants or fire protection systems. This is because the threaded stem can be easily removed for maintenance or repair, and the yoke design allows for smoother movement of the stem.
NRS gate valves, on the other hand, are typically used in applications where space is limited, such as underground pipelines or in building risers. The compact design of the NRS valve allows for a smaller installation footprint, which can be an advantage in tight spaces.
OS&Y gate valves are easier to maintain than NRS gate valves due to the visible threaded stem. The stem can be easily lubricated or replaced when necessary, and the yoke design allows for smooth movement of the stem. However, the exposed stem also makes OS&Y valves more susceptible to damage or contamination from environmental factors.
NRS gate valves, on the other hand, require more specialized tools and techniques for maintenance since the stem is located inside the valve body. However, the internal stem design also makes NRS valves more resistant to damage or contamination from environmental factors, making them ideal for applications where the valve is exposed to harsh conditions.
Both OS&Y and NRS gate valves serve important functions in pipeline systems and offer unique advantages in specific applications. While OS&Y valves are preferred in applications that require frequent maintenance and have more visible stem design, NRS valves are preferred in applications with limited space and have a more compact design with an internal stem. By understanding the differences between these two types of gate valves, engineers and technicians can choose the best valve for their specific application, ensuring optimal performance and longevity of the valve.
For more information, please visit gate valves distributor.