HySecurity MX3739-02, Valve, Flow, PCOMP 2 GPM
HySecurity MX3739-02 is a pressure compensated 2 GPM hydraulic flow valve for select HySecurity HydraWedge SM50 and HydraSupply XL hydraulic applications. Nice HySecurity HydraWedge SM50 parts documentation lists MX3739-02 as "Valve, Flow, PCOMP 2 GPM" for HydraWedge SM50 models. HydraSupply XL parts documentation also lists MX3739-02 as "Valve, Flow, PCOMP 2 GPM" for HydraSupply XL models.
This valve is part of the hydraulic flow-control circuit. Current listings describe MX3739-02 as a pressure compensated 2 GPM flow control valve. Because hydraulic valve fitment depends on flow rating, compensation type, valve cavity or port arrangement, hydraulic circuit, pump pack layout, hose routing, fittings, and operator model, MX3739-02 should be selected only after confirming the original valve and HySecurity parts diagram.
What This Pressure Compensated Flow Valve Does
A pressure compensated flow valve helps regulate hydraulic flow at a specified rate even as pressure conditions change within the approved operating range of the hydraulic circuit. In a compatible HydraWedge SM50 or HydraSupply XL system, MX3739-02 is used where the hydraulic design calls for a 2 GPM pressure compensated flow valve.
A stuck, contaminated, leaking, incorrectly rated, or wrong-type flow valve can cause slow movement, fast movement, uneven travel, poor hydraulic response, heat buildup, pressure issues, or inconsistent wedge or gate operation. Similar symptoms can also be caused by low hydraulic fluid, contaminated fluid, relief valve problems, pressure switch issues, accumulator problems, solenoid valve failure, check valve leakage, pump pack wear, hand pump issues, cylinder bypass, hose leaks, damaged fittings, or mechanical binding.
Compatible With
Use HySecurity MX3739-02 only where the operator parts diagram, original valve, or HySecurity documentation confirms this part number.
- Select HySecurity HydraWedge SM50 applications where MX3739-02 is listed as the pressure compensated 2 GPM flow valve.
- HydraWedge SM50 models where the parts diagram lists MX3739-02 as "Valve, Flow, PCOMP 2 GPM."
- Select HySecurity HydraSupply XL applications where the parts diagram lists MX3739-02 as the 2 GPM pressure compensated flow valve.
- HydraSupply XL models where the parts documentation confirms MX3739-02 for the flow valve location.
- Repairs where the original flow valve is marked, listed, or cross-referenced as HySecurity MX3739-02.
- Applications where the 2 GPM flow rating, pressure compensated design, hydraulic circuit, porting, fittings, and valve location match the HySecurity parts diagram.
Important Compatibility Warning
Do not order MX3739-02 based only on the words "flow valve" or "2 GPM." HySecurity hydraulic systems use multiple flow valves, relief valves, solenoid valves, pressure switches, pressure gauges, check valves, accumulators, hand pumps, pump packs, cylinders, hoses, reservoirs, and fittings.
MX3739-02 is a pressure compensated 2 GPM flow valve. It should not be treated as the same part as the pressure switch, relief valve, solenoid valve, check valve, or manual bypass valve. Installing the wrong flow valve can affect wedge speed, gate speed, hydraulic pressure behavior, heat, cylinder control, and overall system operation.
Pressure Compensated Flow Valve Warning
The "PCOMP" description indicates a pressure compensated flow valve. Do not substitute a non-compensated flow restrictor, generic needle valve, simple orifice, or different GPM valve unless the current HySecurity parts diagram confirms the exact hydraulic function.
A similar-looking valve may not maintain the same flow behavior under changing pressure conditions. The wrong valve can cause incorrect movement speed, poor hydraulic control, overheating, or unsafe operator movement.
Similar Parts That Are Not Automatically Interchangeable
- mx4112-pressure-switch-2200-2500-psi.html">HySecurity MX4112 - pressure switch, 2200-2500 PSI; pressure switch, not the flow valve.
- HySecurity MX3954 - 5000 PSI pressure gauge; pressure-reading gauge, not the flow valve.
- HySecurity MX000174 - 3000 PSI relief valve; pressure-control valve, not the flow valve.
- mx3740-25-gpm-solenoid-valve-hydrawedge-sm50.html">HySecurity MX3740 - 25 GPM solenoid valve; related valve, not the pressure compensated flow valve.
- HySecurity MX000173 - 2P2W solenoid valve; related solenoid valve, not the flow valve.
- mx3955-02-1-2-gpm-pump-pack-hydrawedge-sm50.html">HySecurity MX3955-02 - 1.2 GPM HydraWedge pump pack; related pump pack, not the flow valve.
- mx3955-05-2-5-gpm-pump-pack-hydrawedge-sm50.html">HySecurity MX3955-05 - 2.5 GPM HydraWedge pump pack; related pump pack, not the flow valve.
- mx4054-3000-psi-hand-pump-assembly.html">HySecurity MX4054 - 3000 PSI manual hand pump assembly; related hand pump, not the flow valve.
- HySecurity MX3741 - 2.5 gallon bladder accumulator; related accumulator, not the flow valve.
- HySecurity MX4759 / MX3964 - HydraWedge hydraulic cylinder references; related hydraulic actuator, not the flow valve.
- Generic 2 GPM hydraulic flow valves - not confirmed substitutes unless pressure compensation, porting, fittings, flow direction, pressure range, hydraulic circuit, and parts diagram match.
Not Intended For
- Pressure switch replacement.
- Pressure gauge replacement.
- Relief valve replacement.
- Solenoid valve replacement.
- Check valve or manual bypass valve replacement.
- Pump pack or manual hand pump replacement.
- Accumulator or reservoir replacement.
- Hydraulic cylinder replacement.
- Hydraulic hose kit or fitting-only replacement.
- Smart Touch controller board, display board, power supply, circuit breaker, contactor, or control-box part replacement.
- HydraWedge SM50 spring piston hardware, hinge bushings, proximity switches, or LED wedge light replacement.
- Any hydraulic system where the parts diagram does not list MX3739-02.
Features & Specifications
| Feature / Specification | Details |
| Manufacturer | HySecurity / Nice HySecurity |
| Part Number | MX3739-02 |
| Product Type | Pressure compensated hydraulic flow valve |
| Flow Rating | 2 GPM |
| Valve Type | Pressure compensated flow valve |
| Common Description | Valve, Flow, PCOMP 2 GPM |
| HydraWedge Application | HydraWedge SM50 models where listed by parts diagram |
| HydraSupply Application | HydraSupply XL models where listed by parts diagram |
| Related Hydraulic Components | Pump pack, hand pump, accumulator, pressure switch, pressure gauge, relief valve, solenoid valves, hoses, fittings, cylinder, and fluid condition should be inspected during service |
| Package Contents | Verify before ordering; fittings, adapters, seals, O-rings, mounting hardware, and related hydraulic hardware may be separate unless stated |
Also Known As / Related Part Numbers
- MX3739-02
- HySecurity MX3739-02
- Nice HySecurity MX3739-02
- HYS-MX3739-02
- HYS-mx3739-02
- MX3739-02-5128
- HySecurity pressure compensated flow valve
- HySecurity 2 GPM flow valve
- HySecurity PCOMP 2 GPM flow valve
- HySecurity HydraWedge SM50 flow valve
- HySecurity HydraSupply XL flow valve
- Valve, Flow, PCOMP 2 GPM
- Flow control valve 2 GPM, pressure compensated
- Pressure compensated flow control valve, 2 GPM
- 2 GPM pressure compensated hydraulic flow valve
- MX4112 - related pressure switch; not the same part
- MX3954 - related pressure gauge; not the same part
- MX000174 - related relief valve; not the same part
- MX3740 - related 25 GPM solenoid valve; not the same part
- MX000173 - related 2P2W solenoid valve; not the same part
- MX3955-02 / MX3955-05 - related pump packs; not the same part
Related Parts and Accessories
The correct related parts depend on the installed HydraWedge SM50 or HydraSupply XL hydraulic circuit and why the flow valve is being replaced. Inspect the full hydraulic circuit before ordering only MX3739-02.
- MX3955-02 1.2 GPM HydraWedge pump pack - related pump pack, not the flow valve.
- MX3955-05 2.5 GPM HydraWedge pump pack - related pump pack, not the flow valve.
- MX4054 3000 PSI hand pump assembly - related manual pump, not the flow valve.
- MX3741 bladder accumulator, 2.5 gallon - related accumulator, not the flow valve.
- MX4112 pressure switch, 2200-2500 PSI - related pressure switch, not the flow valve.
- MX3954 pressure gauge, 5000 PSI - related pressure gauge, not the flow valve.
- MX000174 3000 PSI relief valve - related pressure-control valve, not the flow valve.
- MX3740 25 GPM solenoid valve and MX000173 2P2W solenoid valve - related solenoid valves, not the flow valve.
- Hydraulic hoses, fittings, adapters, seals, O-rings, reservoir, fluid, and cylinder components - inspect and verify separately.
Technician Note
Before replacing MX3739-02, inspect the hydraulic fluid level, fluid condition, pump pack output, accumulator condition, pressure switch, pressure gauge, relief valve, solenoid valves, hand pump, hoses, fittings, hydraulic cylinder, and mechanical wedge or gate movement. A speed or flow issue is not always caused by the flow valve itself.
If the hydraulic system has contaminated fluid, water intrusion, metal debris, leaking hoses, stuck valves, relief valve bypass, cylinder bypass, weak pump output, or mechanical binding, replacing only the flow valve may not correct the issue. Correct the cause of poor flow control before installing the replacement valve.
Before Ordering, Confirm
- The required part number is MX3739-02.
- The operator is a HySecurity HydraWedge SM50, HydraSupply XL, or other approved hydraulic application where the parts diagram lists MX3739-02.
- The repair requires the pressure compensated 2 GPM flow valve, not the pressure switch, pressure gauge, relief valve, solenoid valve, pump pack, hand pump, or accumulator.
- The 2 GPM flow rating and pressure compensated function match the original valve and parts diagram.
- The valve location, flow direction, hydraulic port, fitting style, seal/O-ring requirements, and circuit function match the original installation.
- The pump pack, accumulator, pressure switch, relief valve, solenoid valves, hydraulic cylinder, hoses, fittings, and fluid have been checked for related problems.
- The package includes the expected valve and any required fittings, adapters, seals, O-rings, or mounting hardware, or those items are ordered separately if needed.
- The hydraulic system has not been modified with non-standard flow valves, fittings, hoses, pump packs, or hydraulic controls.
Installation and Service Notes
- Disconnect and secure operator power before servicing hydraulic valves or related control wiring.
- Secure the wedge, gate, arm, or moving assembly before opening hydraulic lines or removing valve components.
- Relieve hydraulic pressure according to the manufacturer's service procedure before removing the flow valve.
- Keep hydraulic ports, fittings, hose ends, and valve openings clean during service.
- Do not substitute a non-compensated flow valve, different GPM valve, or generic valve without parts-diagram confirmation.
- Confirm correct flow direction, port connection, fitting tightness, seal condition, and fluid level before startup.
- After installation, check for leaks, correct hydraulic speed, proper pressure behavior, smooth wedge or gate movement, and correct stopping behavior.
- Verify all required safety devices, access control safety inputs, stop circuits, proximity switches, pressure switches, and controller protections before returning the operator to service.
Professional Advisory
Hydraulic flow valve replacement should be handled by a qualified gate technician when the repair involves hydraulic pressure, accumulator circuits, high-pressure fittings, pump output, valve diagnosis, hose routing, heavy wedge plates, hydraulic cylinders, fluid contamination, or unknown prior modifications. Do not bypass hydraulic protections, relief valves, pressure switches, controller protections, proximity switches, limit controls, stop circuits, entrapment protection devices, access control safety inputs, photo eyes, safety edges, or any required safety devices to keep the operator running.
Product Questions & Answers
What is HySecurity MX3739-02?
HySecurity MX3739-02 is a pressure compensated 2 GPM hydraulic flow valve for select HydraWedge SM50 and HydraSupply XL applications.
What operators use MX3739-02?
Nice HySecurity parts documentation lists MX3739-02 for HydraWedge SM50 models and HydraSupply XL models. Use it only where the operator parts diagram confirms this flow valve.
What does PCOMP 2 GPM mean?
PCOMP means pressure compensated, and 2 GPM is the flow rating. This type of valve is designed to help control flow at the specified rate in the approved hydraulic circuit.
Is MX3739-02 the same as MX4112?
No. MX3739-02 is the pressure compensated 2 GPM flow valve. MX4112 is the related hydraulic pressure switch and should not be treated as the same part.
Is MX3739-02 the same as the MX000174 relief valve?
No. MX3739-02 controls hydraulic flow. MX000174 is a 3000 PSI relief valve and is a separate pressure-control part.
Can I use a generic 2 GPM flow valve instead of MX3739-02?
No, not unless the pressure compensation type, flow rating, port style, fittings, flow direction, hydraulic function, and HySecurity parts diagram confirm compatibility.
What should be checked before replacing this flow valve?
Check the pump pack, accumulator, pressure switch, pressure gauge, relief valve, solenoid valves, hand pump, hydraulic cylinder, hoses, fittings, fluid condition, mechanical movement, and parts diagram before replacing only the flow valve.
