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NRS and OS&Y gate valve

2016-12-28 19:52:07

What is the difference between NRS and OS&Y gate valve?


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”)

UL / FM OS&Y Resilient Seated Gate Valves (2”-24”) are UL / FM Approved at the highest rated pressures in the industry.

Specifications

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″
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

UL Listed OS&Y Resilient Seated Gate Valves (14”-24”) Material Specifications:

Part Name Material ASTM Spec.
Body Ductile Iron A536 65-45-12
Wedge Ductile Iron, EPDM Encapsulated
Wedge Nut Stainless Steel AISI 304
Stem Stainless Steel AISI 420
Bonnett Ductile Iron A536 65-45-12
Gasket Rubber EPDM
Packing Graphite Commercial
Gland Ductile Iron A536 65-45-12
Yoke Nut Bronze B62 C83600
Handwheel Ductile Iron A536 65-45-12
Handwheel Nut Ductile Iron A536 65-45-12
NPT Malleable Iron Commercial
Gland Bolt Stainless Steel AISI 316
Bonnet Bolt Carbon Steel A307 B


UL Listed FM Approved OS&Y Gate Valve(2”-12”) Material Specifications:

TECHNICAL REQUIREMENT :
● Design and Manufacture Conform to AWWA C515 
● Flange to ANSI B16.1 Class 125.Other flange types available
● Fusion bonded epoxy coated inside and out 

● Testing Conform to  AWWA C515

● UL/FM approval




No. Part Name Material
1 Gasket C28000
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 1035
8 Seal gasket EPDM
9 Gland ASTM A536 65-45-12
10 Nut ANSI 304
11 Flat Washer ANSI 1035
12 Bolt ANSI 1035
13 Spring Washer ANSI 1035
14 Handwheel ASTM A536 65-45-12
15 Lock nut ASTM B148 C95400
16 Locking screw ANSI 304
17 Stem ANSI 304
18 Stem Nut ASTM B148 C95400
19 Gasket C28000
20 Skeleton ASTM A536 65-45-12
21 Plug Screw ASTM B62
22 Wedge Nut ASTM B148 C95400
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 1021
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