A fire hydrant is a specialy OS&Y, globe valve where the shaft is totally encased and the nut is turned with a special wrench. The stem of the valve itself raises and lowers visibly outside the body of the valve, while the handle remains in a fixed position. Valves like wedge type when closed in heat lines during hot temperature may be very difficult to open in cold temperature due to expansion. What is a Gate Valve? Afterwards remember to tighten pack the packing. Must be the same size as the water service line. Cast iron with bronze facing rings in 8″ and larger sizes; all others solid bronze. Installation Preparation Checklist. Dedicated sprinkler valve handles must be painted green. ASME Specifications: ASME B16. In addition, it is impossible to determine the disc position since the hand wheel and stem do not rise. Wedge Gate Valve: * The wedge shaped disc is utilised to introduce a high supplementary seating load that enables metal-seated wedge gate valves to seal not only against high, but also low, fluid pressures. Some of the above as well as some popular variants are discussed below. Suggested Specifications.
Outside Screw And Yoke (Os&Y) Gate Valve
The handle should then move freely. Fire Protection Resilient Seat OS&Y Gate Valve Flange End. These are normally though conduit type but may also be available without a conduit. What is the difference between NRS and OS&Y gate valves? Gate valves are tested according to – API 598 Standard. 250Nb R/G Gate Valve OS&Y. You can look at an OS&Y gate valve. They are generally slower in actuation than quarter-turn valves and are most commonly used in applications where valve operation is infrequent such as isolating valves. 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. AWWA C500 Gate Valve is the most robust gate valves on the market. The handle and the stem are both threaded so they interact together. Under standard testing procedures (135 °C air at a velocity of 2. OS&Y means Outside Stem and Yoke.
Simply loosen the packing nut or packing screws a couple of turns. What is O S & Y Gate valve and how is it different from a normal Gate valve? This avoids someone accidentally closing the valve and deactivating the fire sprinkler system for the property. Flanged and screw ends. Certification: UL/FM. AWWA C500 Solid Wedge. 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.
Os And Y Gate Valve
Stem: Stainless Steel 304. On NYC water main installations for fire protection all main control valves must be locked in the open position. As it is a globe valve the movement is a very short distance compared to a gate valve. The screws of the valve are held by a yolk on the outer portion of the valve, a wheel in the valve is attached to the nut which turns, allowing the shaft to lower or rise from the lower portion of the valve. Features: - UL 262 Listed and FM 1120/1130 Approved and certified to ANSI/NSF 61 & 372. Complete Assemblies. Wedge gate valve does not shut off against high pressure gas as efficiently as slab or expanding gate valve so in those cases the later is specified.
This valve has a bevel on knife edged single piece parallel slide gate valve and is designed to handle slurry, solids which are liable to obstruct a wedge gate. 22 in Ship Weight 9. Because each sprinkler activates independently when the predetermined heat level is reached, the number of sprinklers that operate is limited to only those near the fire, thereby maximizing the available water pressure over the point of fire origin. 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. In the fully closed position, gate valves provide a positive seal under pressure. NSF Specifications: NSF 372, NSF 61. Frequently if a leak appears on an OS&Y valve it is because the packing is too loose. Size 2 in A-Total Length 3. The only exception to these rules would be if the contractor is making a repair to a existing 2. Gate valves are cheaper than ball valves of same size and quality.
What Is A Gate Yoke
Submittal Sheet & Technical Drawing. HomeSeer Technologies. If an OS&Y valve leaks or the handle will not move. Rubber encapsulated iron wedge. Valve Seat Material: EPDM. But it goes much farther than that, in that an OS&Y valve provides unique protection that a typical gate valve or ball type valve cannot provide. You can still place orders on or send questions via our contact form. Epoxy coated body inside and out per AWWA C-550 (coating NSF and FDA certified). Non rising Stem/Inside Screw: Non rising stem/inside screw design has the chief advantage of requiring minimum headroom for operation. Handwheel – open left or open right.
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. Seat ring inner faces seat against solid walls of body recess. Knife Gate Valves: * Should not be used in hazardous service or high pressure service. The gate design is always of the through conduit type.
What Is Outside Screw And Yoke Valve
MSS Specifications: MSS SP-70. Other states will follow in the coming... 80Nb R/G Gate Valve OS&Y. The valve size cannot be either larger or smaller than the service line size. The NYC plumbing code and OS&Y valves. O-Ring: EPDM Rubber. Talk to our technical team for help finding your part. Gate valves provide straight through unobstructed passage way, which results in minimum pressure loss. ISO Specifications: ISO 9001.
Higher the pressure in the system-better is the closing tightness. Standard- API 600 (FOR SIZE 2" to 24"). System pressure is used to provide isolation. Submittal Drawing 1. Residental or Contractor *. And tell if it is open or closed by the position of the shaft. Valve Disc Material: Ductile Iron. Leviton Security & Automation (HAI). In addition to visual inspection, NYC code also requires that all handles and visual standpipe (sprinkler line) must be color coded. Heat, corrosion, erosion, and solids may damage the stem threads inside the valve and cause excessive wear. Please Note: Currently, the Water and Mechanical product range are only available in QLD, NSW, VIC and ACT. STI - Safety Technology International. The basic design is suitable for use in a wide range of application eg well head isolation, process piping, tank etc. Bronze mounted (IBBM) to handle fluids for above service.
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