Part Number:
2A33687
Release Date:
8/27/2015
Revision: B
9
SECTION II: Installation and Operation
Installation:
The SPM
®
EXL Back Pressure Relief Valve should be installed in a branch on the high-pressure pump line (Fig.
1). It is recommended that the valve be placed downstream away from the high pressure pumps. This
increased distance will reduce the likelihood of the valve seat’s experiencing “chatter”. Any application
requiring localized protection of the high pressure pump is acceptable. However, this will require additional
differential between the fluid pressure and set pressure of the valve to prevent “valve chatter”. Contact
Engineering for additional recommendations.
It is recommended to operate the valve in the upright position. This will reduce the tendency for proppants to
accumulate around the sealing area and potentially affect the sealing performance. However, the valve will
function within 90 degrees declination (Angle from vertical).
The gas regulator and gas back pressure relief valve should be installed as close to the relief valve as possible.
The nitrogen filled high-pressure cylinder must be secured to either a skid or trailer or by staking it to the
ground.
All general Frac Fluids may be discharged through the valve. The valve will tolerate clean liquids better than
others and lighter liquids will flow greater rates than heavier liquids. Particulates, abrasives and contaminants
will not preclude the valve from opening at the appropriate set pressure. However, abrasive materials will
cause some wear between the wear sleeve, nozzle, and main seal. While these components feature wear
resistant surfaces, their life will be reduced as the abrasives increase in the fluid.
WEIR OIL & GAS
HIGHLY RECOMMENDS THAT AN ISOLATION VALVE BE PLACED BETWEEN
THE PRESSURE LINE AND THE RELIEF VALVE. THE ISOLATION VALVE MUST BE IN THE OPEN
POSITION DURING NORMAL OPERATION.
With the isolation valve installed, as shown in Figure 1, any time the pressure exceeds the set pressure at the
EXL Back Pressure Relief Valve, the fluid will pass through the valve and out the discharge.
Figure 1
