The SRX is available in two sizes, 1.75 in OD or 3.5 in OD for use in 2-in and 4-in wells respectively. Pump flow rates are up to 9.5 gpm. The SRX pump is available in a top-loading configuration for recovering total fluids or a bottom-loading model with higher pumping rates for dissolved phase.
Our 25 years of experience with pneumatic pumps has produced the SRX. We used proven components to build a product that is simple and has fewer parts. The result? Reliability and effortless maintenance. It is so simple that, in minutes, the complete pump (including air, exhaust and fluid discharge check valves) can be disassembled with only one wrench.
Top view of TR-974 and TR-978 top-loading pumps.
The SRX is installed to the desired drawdown level. It requires only three lines: air supply, air exhaust and fluid discharge. Compressed air is supplied to the pump (generally 0.5 psi per foot of depth is sufficient). As the liquid enters
the pump, the internal float moves to the upper (or “ON”) position. At that end point, the float opens the air valve. Air enters the pump, closes the bottom inlet check valve (on bottom-loading versions), and pushes the fluid (in the pump chamber) through the center discharge tube and all the way to the surface. As the fluid is expelled from the vessel, the float returns to the lower limit (or “OFF” position) at which point it closes the air inlet valve and opens the air exhaust valve. As the pump fills under the fluid’s own static pressure, air is vented through the exhaust port and the cycle is
automatically repeated based on the well recharge rate.
Top-loading (SRX-R TL) pumps are selected for pumping total fluids (LNAPL and ground water simultaneously). Water table drawdown will be maintained at a level corresponding to the top inlet of the pump. Pumps of shorter lengths are available for lower drawdown requirements.
Bottom-loading pumps (SRX-R BL) are selected for dissolved phase or DNAPL applications. When installing the
pump, the head is positioned at a depth of approximately 10 inches higher than the desired water table depression.
|Air Valve Design|
|The advanced air valve design provides a leak-tight seal. This is accomplished with a special Viton® ball 1 on a stainless steel seat 2. The positive seal eliminates air leakage that can increase the formation of precipitates at the pump head. Assisted by an isolated magnet, the valve shifts positively, — every time. This prevents stalling even in slow-filling situations. No adjustments are necessary with this valve assembly.|
|Air Valve Filtration|
|The air valve incorporates 330-mesh stainless steel screens 3 to prevent debris from entering the ball/seat sealing assembly, possibly causing the valve to malfunction. On other pumps, when the air supply to the pump is turned off, the float will activate the air valve and create a pathway through which debris may enter the air valve and interfere with the proper seating of the ball. This is not a concern with the SRX pump. Please note that the 1.75 inch pump only has an air inlet filter assembly.|
|To make routine maintenance easier, the air and exhaust valves on the SRX can be accessed from the top of the pump by removing the air and exhaust hose barbs, eliminating the need to disassemble the pump body.|
|Lightweight Control Rod|
|The lightweight control rod 4 is a primary reason why the SRX does not stall. Less weight translates into less force that is required to open the air valve. This ensures a quick, positive opening every time. The control rod is isolated from the energy that is created by the float movement 5, thereby eliminating any stress on the rod.|
|The SRX pump is designed to be completely disassembled with just one wrench. Remove the bolts from the bottom assembly, slide the body off and remove two cotter pins to access the control rod and float. Simple!|
|For cleaning bottom-loading pumps, the screen is easily removed by unthreading a single bolt. To protect the screen from collapse, the screen assembly is supported by an arch 6 at the bottom of the pump. A threaded inlet screen 7 is standard on all top-loading pumps to prevent debris from entering through the top inlet.|
|Stainless steel, Type 304||Pump body, discharge tube|
|Stainless steel, Type 303||Pump head, bottom intake valve, assembly control rod, control linkage assembly|
|Brass||Hose and tubing barbs|
|Hydlar (Nylon/Kevlar® composite)||Control rod bushing|
|Nylon®||Discharge and top-loading check valve ball|
|Buna-N®||Botton intake check valve ball|
|Viton®||O-ring seals, air inlet ball valve|
|Ebonite (expanded Buna-N®)||Float|
|Red brass||Top intake casting|
(Flow rates will be affected by the head above the pump as well as the length and I.D. of the air exhaust line.)