API 598 ASTM A351 GR. CF8M SS316 STEAM STAINLESS STEEL FLANGE END
GLOBE VALVE
Description:
- Rising Stem
- OS&Y, Flexible Wedge
- Body: ASTM A351 Gr. CF8M
- Disc: ASTM A351 Gr. CF8M
- Stem: SS316
- Packing: PTFE
- Face to Face: ANSI B16.10
- Flange Dimensions: ANSI B16.5 150
- Test Standard: API 598
- NACE MR-0175 Full Compliance
The globe valve for steam and high temperature has a rising
rotating stem and handwheel. The offered cast iron globe valve is
recommended for service in commercial and industrial applications,
including hot and cold water, HVAC, steam, compressed air, gas and
other general utility services. Globe valves are recommended for
throttling or regulating flow.This globe valve has a body made of
cast iron GG25 and a stainless seat.
This cast iron globe valve is used for throttling flow control.
Shut off is accomplished by moving the disc against the flow stream
rather than across it as in the case with a gate valve. The flow
pattern through the cast iron globe valve for steam involves
changes in direction, resulting in greater resistance to flow,
causing high pressure drop.
The cast iron globe valve is used often in applications like
Heating, water distribution and water at Min and max Temperatures
between - 10°C to + 300°C.
The fluid does not get into contact with the valve stem. The valve
is hermetically tight to the atmosphere. To improve operational
safety, the valve is provided with additional stuffing-box packing.
Specifications of the globe valve for steam:
- Bolted bonnet and gland pack
- Stainless steel seat
- PN16 Flanges R.F.
- Pressed seat
- Grey painting RAL 7011-7012, 50-100µ thickness
During installation respect the flow direction indicated by the
arrow, Keep greased the stem and Tighten the gland packing during
the setting.
Valves Specification
| Actuation | handwheel |
| Connection | for mounting between ANSI 150 and DIN PN 10/16 pipe flanges. |
| DN: | 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200 |
| PN: | 16 |
| Seal Material | SS AISI 420 |
| Tmax | -10°C/+300°C |
| Valve Type | Globe valve, rising stem |
General specification
| Material: | Cast iron EN GJL-250 |
| Applications: | Cast iron globe valve - flanged - for steam and high temperature |
| P [bar] | Max Pressure Ps : 16 bars, Steam : 10 bars maximum |
| Approvals: |
- Fabrication according to ISO 9001 :2015 and ISO 14001 : 2015
- DIRECTIVE 2014/68/EU : CE N° 0062 Risk Category III module H
- Certificate 3.1 on request
- Tests according to EN 12266-1, rate A
- Length according to EN 558 series 1 ( DIN 3202 F1 )
- Flanges R.F. according to EN 1092-2 PN16
- Approval certificate Polish PZH
- Russian certification TRCU (marking and declaration EAC on request)
|
Construction of Globe Valve
Though the construction and design of globe valve is usually made
according to the requirements, there are three main designs of the
globe valve
- Z-body type valve
- Y-body type valve
- Angle valve
Z-body type valve
This is the simplest and most commonly used design of globe valves,
favorable for applications involving water flow. The name Z-shaped
is derived from the Z shaped diaphragm or partition in the bulbous
shaped body. The stem and the disc move at right angle to the valve
body, aligning with the horizontally arranged seat. The stem passes
through the bonnet attached to a wide opening at the top.
Y-body type valve
The Y-body type valve design is a solution to the problem of
pressure drop which is commonly found in globe valves. In this
design, the valve seat and stem are angled at approximately 45° to
the valve axis. This results in a much straighter path for the
fluid flow, providing a more pressure resistant environment inside
the valve.
The Y-body valves are mainly suited for high pressure applications
wherein problems related to pressure drop are common. However, in
case of throttling purpose, the pressure resistance might not work
effectively, especially if the valve is smaller in size. This is
also because in smaller valves, the flow passage is not as
carefully streamlined as that in larger vessels.
Angle Valve design
The angle globe valve is a modification of the design of the basic
Z-shaped glove valve. The inlet and outlet ends are placed at right
angles and the diaphragm is generally a simple flat plate. The
fluid flows through the valve body in a right angled flow path and
get discharged downwards in a more symmetrical manner. These
characteristics are extremely important in applications involving
high pressure. However, in moderate conditions the valve functions
more or less similar to the Z Shaped Valve.
Globe valves are used for both low and high temperature
applications. In low temperature applications the globe valves are
so installed that the pressure is under the disk. This helps in
easy operation of the valve and also for protecting the packing and
preventing erosion to the seat and disk. For high temperature, the
valves are so installed that the pressure is above the disk. This
would prevent the steam below the disk from contracting upon
cooling and tend to lift the disk off the seat.
Arrangement
Both the valve seat and the disc are arranged at right angle to the
axis of the valve. The seat can either be screwed into the valve
chest or can be a part of the body. The seating can either be flat
or mitered and the stem would be threaded above or below the
stuffing box. The spindle is held in the valve disc by a nut and
the leakage is prevented using stuffing box, which is packed with
packing material and gland.
Types of Discs
Mainly three main types of discs are used in globe valves.
- The ball disk
- The composition disk
- The plug disk
