NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224
3
D. SERVICE
When installing valves for service in corrosive media, the NIBCO Chemical
Resistance Guide may be consulted for specific data or contact can be made
with NIBCO Technical Services. It is, however, the obligation of the user to make
the ultimate decision of fitness for use.
E. PRESSURE TEMPERATURE RATINGS
Pressure and temperature ratings may be found in the Engineering section of the
latest printing of NIBCO catalog. This information is taken from applicable ANSI
Standards.
F. CODES & REGULATIONS
A valve specified for use in compliance with the ASME Boiler and Pressure
Vessel Code, the ANSI code for Power Piping, or other set of regulations so-
specified is subject to the limitations and restrictions of said-regulations as
mandated by the authority having jurisdiction.
G. PRODUCTION TEST PROCEDURES
Valves are hydrostatically shell and seat tested at twice the WWP rating
according to UL and/or FM testing guidelines.
H. PRINCIPAL DIMENSIONS
Principal dimensions of the valve are specified in the appropriate catalog.
1.3 DETAILED DESCRIPTION
The gate valves listed above and covered in these instructions are ductile iron, cast iron,
bolted bonnet, outside screw and yoke (rising stem) and inside screw (non-rising stem)
valve types. The valve is operated with the handwheel. They are used to start or stop the
flow of fluids in piping systems. Clockwise rotation of the handwheel closes the valve.
The body and bonnet are threaded and the joint is sealed with a non-asbestos gasket or
O-ring. On metal-seated valves, flow through the valve is stopped by forcing the wedge
down between the seat rings which are screwed into the body. The wedge is solid and is
guided through its entire travel by matching guides in the body.
On resilient-seated valves, flow is stopped by forcing the rubber-encapsulated wedge
against the epoxy-coated valve body. The solid-metal wedge is encapsulated with an
elastomer and is guided through its entire travel by matching guides in the body.
A. RISING STEM OS & Y GATE VALVE
In NIBCO O.S.&Y. metal-seated, rising-stem valves, the bottom of the stem
screws into the wedge and is prevented from unscrewing by installing a solid
wedge pin.
(8 pages)
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