Courtesy of wikipedia. Higher the pressure in the system-better is the closing tightness. This differs from a Wet Connection on a domestic water service where the tap connection would be one size smaller than the pipe. Outside Screw and Yoke, Flanged End. Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. Technically OS&Y stands for ' O utside Screw and Y oke'.
All valves must be UL Listed (UL stands for Underwriter Laboratories, which is a global independent science company). Flanged valves conform to American Standard Face to Face Dimensions, Ferrous Flanged Valves (ASME B16. Flexible-wedge disc. When the stem of the OS&Y is raised out of the body you know the water is on. Height: 52-13/20 in. The two gate halves are forced out against the seats at point of closure providing a tight sealing without the assistant of fluid pressure. Flanges save 1/16″ raised face. Because gate valves open slowly they also prevent water hammer effect. What is the difference between NRS and OS&Y gate valves? OS&Y valves visibly show whether the valve is opened or closed which differs from a domestic water service where you can simply turn on the shower or sink to test its functionality. This avoids someone accidentally closing the valve and deactivating the fire sprinkler system for the property. The glass bulb or link applies pressure to a pip cap which acts as a plug which prevents water from flowing until the ambient temperature around the sprinkler reaches the design activation temperature of the individual sprinkler.
One piece solid wedge is used as they are easily made. Simply loosen the packing nut or packing screws a couple of turns. Simply Automated Incorporated. Gate valves are cheaper than ball valves of same size and quality. Installation Preparation Checklist. In this case the contractor would hook-up to the existing 2" tap on the city main. All water main valve handles must be the following: Dedicated standpipe valve handles must be painted red. When ordering we have to make it clear to vendor regarding downstream sealing only or upstream + downstream sealing.
Internal pressure tends to create leaks in the body bonnet joint. Electronic Solutions, Inc. - Elk Products. In addition, because they are UL rated, they seem to be better constructed than many other typical water valves. Slab Gate Valves: * These have a single parallel faced slab gate, which sides over floating seats. The bulb breaks as a result of the thermal expansion of the liquid inside the bulb. Gaskets are carefully designed to produce a tight seal regardless of the line conditions that can be easily dismantled for maintenance operations. In a non-rising stem (NRS) gate or globe valve, the shaft screw nut is built into the INTERNAL valve disk or the valve plug. Why is an OS&Y valve so important?
Gate valves are tested according to – API 598 Standard. On NYC water main installations for fire protection all main control valves must be locked in the open position. Wedge shaped solid and flexible gates are available. Flanged end drilling complies with ASME/ANSI B16. Part #NF607RWSLF10 | Item #7052142 | Manufacturer Part #NS2920M. Cast iron with bronze facing rings in 8″ and larger sizes; all others solid bronze. In most cases when installing a new 3" ductile iron sprinkler service or larger, you will be required to install a wet connection of equal size to the pipe unless approved plans state otherwise. And tell if it is open or closed by the position of the shaft. In addition to visual inspection, NYC code also requires that all handles and visual standpipe (sprinkler line) must be color coded. 2016-12-30 18:56:02. Wedge: EPDM Coated Ductile Iron. 86 in in Quantity per Carton 2 Ship Weight 6. The fact that it is always perfectly clear whether an OS and Y valve is open or closed seems to add to it's longevity. Thank you for shopping with American Backflow Products Company.
Parallel Slide Gate Valves: * These are made with 2 body pieces assembled with a spring in it. Close-grained cast iron. Under standard testing procedures (135 °C air at a velocity of 2. Classification of Gate Valves: According to bonnet construction: Bonnets for gate valve come in different designs to satisfy various requirements. The NYC plumbing code and OS&Y valves.
The stem and hand wheel positions indicate the position of the disc inside the valve. HomeSeer Technologies. Never cut corners when it involves fire protection for your family or your property. Options: - Stainless steel fasteners: Type 304 or 316. Advanced Control Technologies (ACT). The time it takes before a bulb breaks is dependent on the temperature.
The gate design is always of the through conduit type. The basic operation of this kind of valve, where the seal is achieved from the pressure exerted by the fluid flowing through the valve, is as follows: Internal pressure forces the bonnet upwards against the gasket, creating forces in the contact areas between the gasket and the bonnet and between the gasket and the body. The RTI can also be specified in imperial units, where 1 ft is equivalent to 0. Bonnet: Ductile Iron. In an NRS valve, the stem will turn to open and close the gate, but the stem does not move up or down as it turns. Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb or a two-part metal link held together with fusible alloy such as Wood's metaland other alloys with similar compositions. NSF Specifications: NSF 372, NSF 61. Design Standard: AWWA C509/C515.
Our office is currently closed for the weekend. Valve Size: Please select. One quick look at an OS&Y valve with the stem raised out of the body of the valve and you will know that the water is on. 22 in Ship Weight 9. That means that when the handle is turned it directly raises and lowers the gate of the valve by interacting directly with the stem of the valve. Meets or exceeds performance requirements of AWWA C509 and C515 for 3 in and larger valves.
OS&Y means Outside Stem and Yoke. How does a fire sprinkler head operate? Coating: Fusion Bonded Epoxy. Product Specifications.
Gate vales ≤ 2" are provided with reduced port (sometimes called conventional or standard).
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