Flowserve E790 - Manual (Page 2)

Flowserve recommends replacement of
all soft parts whenever the valve is disas-
sembled for reconditioning. Replacement
parts can be ordered in kit form.
4. Reassembly
A. Put one seat (10) in body (14).
NOTE: Seats (10) are to be installed
with concave surfaces positioned
against the ball.
CAUTION: The high-pressure valve
Model E790K is a uni-directional (one-
way) valve and it is extremely
important that the unslotted
downstream seat and the slotted
upstream seat be positioned properly.
The unslotted downstream seat is placed
in the solid end of the body and the slot-
ted upstream seat is placed in the spacer
end of the body.
B. Lightly grease the stem seals (17) and
the seal area and threads of the stem (2).
Insert stem seal(s) (17) into the lower
stem seal cavity with the raised outer
edge facing into the counterbore. (The
1 /
4
"
thru 1 /
2
" size and all sizes of the FIRE-
GARD seals are square cut seals.) Insert
stem (2) through the installed stem seals
(17) and the body (14). Place the travel
stop (5) on the stem (2) so that it rests
on the top surface of the body (14).
Thread the adjusting nut (18) on the
stem (2) and torque to
3 /
4
of the final
torque value for the adjusting nut (18).
Remove the adjusting nut (18) and the
travel stop (5) without moving the stem
(2). Place the grounding washer (19) into
the upper seal cavity with the raised fin-
gers pointing up. Push the upper stem
seal(s) (17) into the counterbore with
raised outer edge pointing into the valve.
Add the gland ring (6), the travel stop (5)
and the adjusting nut (18). Make sure the
travel stop (5) is installed so that the
valve can close in a clockwise direction
and open counterclockwise. If the rota-
tion is not correct, the travel stop (5)
must be inverted. Torque the adjusting
nut (18) to the value shown in Figure 3.
Cycle several times and check the stem
nut torque.
C. Turn the stem (2) to a position with the
stem tang flats inside the body parallel
to the cavity. (Ball will be in the closed
position and stay in this position through
steps D, E, F and G.)
D. Install the ball (9). NOTE: Ball should be
carefully examined for nicks, scratches,
pitting or corrosion and replaced as
necessary.
E. Put other seat (10) into seat socket (8)
and fit up against shoulder in body (14).
(See note in paragraph 4A.)
F. Install spacer seal (16).
G. Install threaded spacer (7) using appro-
priate allen type wrench or hexagonal
bar. (See Figure 1 on page 1).
NOTE: In order to achieve proper seat
preload against ball, threaded spacer (7)
must come to a complete stop when
screwed into body (14).
H. Press body seal (11) and end seal (15)
and threaded spacer (7) into grooves on
face of body and threaded spacer.
I. Place body (14) back into line position
and tighten union nuts (12).
J. Install travel stop (5), if required (see
Figure 2), handle (1) and handle retainer
nut (4).
5. Testing
Prior to placing valve back into line position
test as follows:
A. Place the closed valve in a vise with the
pipe run in the vertical position and con-
nect air pressure to lower port.
Introduce 50 to 100 psig air. Pour water
into upper port to cover the ball and
visually check for bubbles. If bubbles
appear, pour the water out, cycle the
valve several times and recheck. To
check for leakage in the other port,
reverse the valve and introduce air pres-
sure to the port just checked.
B. In the event of stem seal leakage, adjust
as described in Section 2 “Stem Seal
Adjustment.”
Flow Control Division
McCANNA/MARPAC Valves
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended function
safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial
service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible applications. The purchaser/user must therefore
assume the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve products. The purchaser/user should read and understand the Installation
Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or as a guarantee of
satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this product. Because Flowserve
is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice. Should any question arise concerning
these provisions, the purchaser/user should contact Flowserve Corporation at any one of its worldwide operations or offices.
For more information about Flowserve Corporation, contact www.flowserve.com or call USA 1-800-225-6989.
FLOWSERVE CORPORATION
FLOW CONTROL DIVISION
1978 Foreman Drive
Cookeville, Tennessee 38501 USA
Phone: 931 432 4021
Facsimile: 931 432 3105
www.flowserve.com
© 2003 Flowserve Corporation, Irving, Texas, USA. Flowserve and Worcester Controls are registered trademarks of Flowserve Corporation. MMAIM2002 (Part IM005)
Stem Nut
Torques (lb-ft) Number of Seals
SIZE TORQUE UPPER LOWER
1 /
2
" 5 1 1
3 /
4
" to 2" 10 1 2
NOTICE: McCANNA Valves are designed and manufactured using good workmanship and materials, and they meet all applicable industry standards. Flowserve Corporation is anxious to avoid
injuries and property damage which could result from misapplication of the product. Proper valve selection is imperative. Examples of the misapplications or misuse of a valve include but are not
limited to use in a service in which the pressure/temperature rating is exceeded or in a chemical service incompatible with the valve materials; use of undersized valve actuators; use of extremely
fast valve actuation and/or continuous valve cycling on standard valves; making modifications of the product of any kind; failure to use caution in operating valves in high temperature, high pres-
sure, or highly hazardous services; and the failure to maintain valves as recommended. The right is reserved to change or modify product design or construction without prior notice and without
incurring any obligation to make such changes and modification on products previously or subsequently sold.
Figure 3
Printed in USA 11/03