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Sapag Type 7700 pressure relief valves
Installation, Maintenance and Adjustment Instruction
Maintenance - assembly
1.
Prior to assembly, the following parts are to be coated with a lubricant/sealant such as pure
nickel "Never-Seeze" or equivalent. Other lubricants/sealants can be used depending on
service conditions.
2. Disc assembly
• Metal seated valve
With the disc holder in the inverted position, drop in the disc insert.
• O-ring soft seated valve
Coat the entire O-ring (except TFE O-rings) with Parker Super O-Lube. Insert the O-ring into the
groove in the disc holder. Push the disc insert into the disc holder. TFE O-rings may require the
use of a small press or, with care, a hammer and a punch.
3. With the guide inverted, drop in the disc assembly.
4. With the guide still inverted, install the base into the guide.
5. The base/guide/disc assembly can now be turned upright and placed into a vise or fixture for
assembly of the remaining components.
Note: Be sure to clamp only onto the wrench flats of the base.
6. Place the spring and spring washers onto the spindle.
7. While holding the spindle in place lower the cylinder into place on the base and screw tightly
onto the base.
8. Screw the adjusting bolt nut onto the adjusting bolt and install into the cylinder.
9. Screw the cap onto the cylinder.
Assembly of caps and lifting lever devices
Type A (Screwed Cap with Test Rod)
Apply pure nickel Never-Seeze to the cap sealing surface and screw the cap onto the top of the
cylinder. Tighten the cap with a suitable wrench. Install the cap plug O-ring and screw the cap plug
into the cap. The test rod is installed only during system hydrostatic testing.
Never install the test rod unless performing system hydrostatic testing.
Type F (Packed Lifting Lever)
1. Apply Loctite 242 or equivalent to the spindle threads. Screw the spindle nut onto the spindle.
Screw on the cap handtight.
2. Apply Parker Super O-Lube to the cam O-ring and install onto the cam. Insert the cam into the
sleeve. Install the lever onto the cam and secure with the lever pin.
3. Screw the lever assembly into the cap. If the cam interferes with the spindle nut remove the
spindle assembly and raise the spindle nut. Repeat until the spindle nut is approximately 1/16"
above the cam.
4. Once the spindle nut is in position, remove the cap and screw the locknut on the spindle and,
while firmly securing the spindle nut with locking pliers, tighten the locknut.
5. Apply pure nickel Never-Seeze or equivalent to the cap threads and to the cap sealing surface.
Screw the cap onto the top of the cylinder. Tighten the cap with a suitable wrench.
6. Apply Parker Super O-Lube or equivalent to the cam sleeve O-ring and install the O-ring. Install
the lever assembly.
7. Install the gap plug O-ring and screw the cap plug into the cap. The test rod is installed only
during system hydrostatic testing.
Never install the test rod unless performing system hydrostatic testing.
Replacement spare parts
Ordering information
Emerson recommends that a sufficient inventory of spare parts be maintained to support
process requirements. Always be sure to use genuine Sapag parts to ensure continued product
performance and warranty.
Parts
To order parts, the following information should always be included:
1. Quantity
2. Part name, i.e. (disc insert)
3. Size, style, type and valve number
4. Serial number
5. Original purchase order number (if the nameplate has been destroyed.)
Note: The size, style, set pressure and serial number can always be found on the valve nameplate.
Springs with washers
To order springs with washers, the required valve set pressure must also be specified in addition to
the other parts information. Should back pressure (fixed or variable) or elevated temperature exist
during operation, also specify these conditions.
For additional information about Sapag type 7700 pressure relief valves, see Sapag datasheet
SAPDR-0056.
Emerson reserves the right to change the contents without notice
Cap threads
Cap to cylinder
sealing surface
Spring
washer
bevels
Guide
sealing
surfaces
Base to cylinder
threads
Test rod
View showing valve
gagged with test rod
Cap plug
Cap plug
O-ring
Cap
Type A
Cap plug
Cap plug O-ring
Locknut
Spindle nut
Cam
Cap
Type F
page 4
Adjusting
bolt threads
Spindle
point
bearing
surface
(metal
seated
valve only)
Cam sleeve
O-ring
Cam sleeve
Lever pin
Cam O-ring
Lever
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