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YARWAY seatless blow-off valves
Type b and Type c
Installation, operation and maintenance instructions
PRINCIPLE OF OPERATION
the seatles blow-off valve is a manually
operated sliding primarily for boiler blow-off
service where high temperature fluid,
containing dirt, sediment and scale, is
encountered.
when the valve is open (fig. 2) the controlled
fluid passes through the ports in the plunger
(8) and lower gland (5) and discharges to the
valve outlet via the center of the plunger
assembly. In the closed position the shoulder
of the plunger assembly contacts the upper
gland (6). this feature provides additional
loading from the handwheel to compress the
packing rings (3) (4) and assure leak-tight
shut-off. any packing relaxation during service
is accommodated by the heavy compression
springs (14) which provide a constant packing
load.
VALVE OPERATION
open the valve quickly and fully. Never use this
valve to throttle the flow in the partly open
condition as this will reduce the packing life.
Close the valve in the same manner. apply a
hard turn at the end of the valve travel. this
will assure that the plunger seats against the
upper gland which, in turn, will recompress
the packing rings.
In operating Yarway seatless valves in tandem,
the valve next to the boiler should be used as
the blowing valve, opened last and closed first.
the outside or sealing valve should be opened
first and closed last.
If a Yarway double tghtening valve is used in
tandem with a Yarway seatless valve, the
double tighteningvalve is placed next to the
boiler and is opened first and closed last. the
seatless or outside valve is the blowing valve
and is opened last and closed first.
Emerson.com/FinalControl
WARNING
Hot discharge from this product may cause severe
burns. Discharge must be piped away or directed
so that persons in the vicinity are not endangered.
This product must be isolated, vented and cool to
the touch before repairing or inspecting.
© 2018 emerson. all Rights Reserved.
VCIOM-03114 EN 18/10
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Summary of Contents for Emerson YARWAY B
- Page 1 Emerson.com/FinalControl VCIOM-03114 EN 18/10 © 2018 emerson. all Rights Reserved.
- Page 2 YARWAY seatless blow-off valves Type b and Type c MAINTENANCE AND ADJUSTMENT fIguRe 2 type C angle valve Packing ring adjusment Yoke nuts (15a) should be tightened at regular intervals. the yoke springs (14) will maintain a constant load on the packing. Packing rings will relax slightly during use and an adjustment may be required.
- Page 3 YARWAY seatless blow-off valves Type b and Type c PARTS LIST fIguRe 3 NOTE: seatless blow-off valve gland and packing any malfunction of this product must be reported to Item Description assembly the service department. Repair made to the product by bridge plate assembly unauthorized personnel will void the warranty.
- Page 4 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Yarway is a mark owned by one of the companies in the emerson automation solutions business unit of emerson electric Co. emerson automation solutions, emerson and the emerson logo are trademarks and service marks of emerson electric Co.