HySecurity MX000659, VALVE, RELIEF, EX, 1500 PSI
The HySecurity MX000659 is a replacement 1500 PSI hydraulic relief valve for select HySecurity and Nice HySecurity hydraulic gate operator systems. It is commonly listed as VALVE, RELIEF, EX, 1500 PSI and as a Soft Start Operators Relief Valve.
This valve is used in compatible hydraulic circuits where system pressure must be controlled or relieved at a specified range. In a hydraulic gate operator, the relief valve helps protect and regulate the hydraulic system by limiting pressure when the system reaches the valve setting. This can affect gate movement, hydraulic force, soft-start behavior, and pressure-related operator performance.
MX000659 should be selected by HySecurity part number, operator model, hydraulic manifold, valve cavity, pressure rating, and parts diagram. Do not order by the words relief valve alone. HySecurity hydraulic operators may use different relief valves, brake valves, counterbalance valves, check valves, directional valves, valve coils, pump packs, and soft-start manifolds depending on operator family and production configuration.
What This Relief Valve Does
The MX000659 relief valve is designed to open or relieve pressure when the hydraulic circuit reaches the valves set pressure range. In compatible HySecurity systems, this helps manage the hydraulic pressure available to move the gate while protecting the pump pack, valves, hoses, hydraulic motor, and drive components from improper pressure conditions.
If the relief valve is leaking, sticking, contaminated, incorrectly adjusted, installed in the wrong cavity, or matched to the wrong hydraulic system, the operator may move weakly, stall, chatter, build too much pressure, operate inconsistently, trip faults, or fail to move the gate properly. These symptoms can also be caused by low hydraulic fluid, contaminated fluid, leaking hoses, bad quick disconnects, a weak pump pack, worn hydraulic motor, brake valve problems, soft-start issues, poor gate movement, or controller-related problems.
Compatible With
The HySecurity MX000659 is intended for select HySecurity / Nice HySecurity hydraulic operator applications where this 1500 PSI EX relief valve is specified. Compatibility depends on the exact operator model, hydraulic manifold, relief valve cavity, pressure rating, soft-start layout, pump pack configuration, and current HySecurity parts documentation.
- Select HySecurity hydraulic gate operators where MX000659 is listed as the 1500 PSI relief valve
- Select EX hydraulic operator configurations where VALVE, RELIEF, EX, 1500 PSI is specified
- Select soft-start operator hydraulic circuits where MX000659 is listed as the relief valve
- Select pump pack or soft-start manifold service applications where the parts diagram confirms MX000659
- Operator repairs where the original relief valve is marked, listed, or cross-referenced as MX000659
Do not assume MX000659 fits every HySecurity hydraulic operator. Similar systems may use relief valves with different pressure settings, adjustment ranges, valve cavities, cartridge styles, or hydraulic functions.
MX000659 vs. Related Hydraulic Valves
HySecurity hydraulic systems use several valve types that may look similar but perform different jobs. MX000659 should not be substituted for another valve unless the parts diagram confirms it.
- MX000659: 1500 PSI EX relief valve / soft-start operator relief valve.
- MX000174: Related 3000 PSI relief valve reference used in select HySecurity hydraulic systems, not the same part.
- MX000657: 3:1 counterbalance / brake valve, not the same part.
- MX000171: Related check valve reference used in select HySecurity hydraulic systems, not the same part.
- MX001257: Related directional valve with manual function, not the same part.
- MX000184: Related 24VDC directional valve coil, not the same part.
Relief valves, counterbalance valves, brake valves, check valves, directional valves, and coils are not interchangeable just because they are part of the same hydraulic system. Match the part number, pressure rating, valve function, cavity, and operator documentation before ordering.
Related Soft-Start and Pump Pack Notes
MX000659 may be encountered during soft-start manifold, pump pack, or pressure-control service. It should be kept separate from complete soft-start kits and pump pack assemblies.
- MX001276: Face down AWOG soft-start manifold kit used in select HySecurity hydraulic applications.
- MX000618: Face down AWOG hose assembly / plugged AWOG assembly used in select pump pack layouts.
- MX001106: 2000 PSI hydraulic pressure gauge kit used for pressure testing in select HySecurity hydraulic systems.
- MX000659: Individual 1500 PSI relief valve used where the parts diagram specifies this valve.
If the repair requires a complete manifold kit, pump pack, hose assembly, or pressure gauge setup, ordering the individual relief valve alone may not provide all parts needed for service.
Not Intended For
- Universal hydraulic relief valve replacement
- Replacing a 3000 PSI relief valve such as MX000174
- Replacing a counterbalance / brake valve such as MX000657
- Replacing a check valve, directional valve, valve coil, complete pump pack, or soft-start manifold kit
- Replacing hydraulic hose kits, hydraulic motors, reservoirs, controller boards, or electric motors
- Correcting weak movement caused by gate drag, worn drive wheels, low fluid, contaminated fluid, leaking hoses, weak pump output, or incorrect limit setup without diagnosis
- Changing hydraulic pressure settings without the correct HySecurity service procedure and pressure gauge
- Opening or removing a hydraulic valve from a pressurized circuit
Important Compatibility Warning
MX000659 should be selected by HySecurity part number and hydraulic circuit location, not by appearance alone. The valve cavity, pressure rating, adjustment style, and hydraulic function must match the original valve.
Relief valve adjustment can affect gate force, hydraulic performance, and inherent entrapment sensor behavior on applicable HySecurity operators. Incorrect relief valve selection or adjustment can cause weak gate travel, excessive pressure, heat buildup, component damage, or unsafe gate operation.
Features & Specifications
| Feature / Specification | Details |
| Manufacturer | HySecurity / Nice HySecurity |
| Part Number | MX000659 |
| Product Type | Hydraulic relief valve |
| Common Description | VALVE, RELIEF, EX, 1500 PSI |
| Alternate Description | Soft Start Operators Relief Valve / 1500 PSI relief valve |
| Pressure Rating | 1500 PSI |
| Configuration Reference | EX / soft-start operator relief valve reference where specified by HySecurity parts documentation |
| System Area | Hydraulic pressure-control circuit, pump pack, or soft-start manifold area depending on operator model |
| Primary Function | Helps control or relieve hydraulic system pressure in compatible HySecurity hydraulic circuits |
| Related Valve References | MX000174 relief valve, MX000657 counterbalance valve, MX000171 check valve, MX001257 directional valve, and MX000184 valve coil are related hydraulic parts, not substitutes |
| Service Note | Pressure testing and adjustment should be performed with the correct gauge and current HySecurity procedure |
| Included Items | Relief valve only unless the current supplier package specifically includes seals, O-rings, fittings, adjustment cap, instructions, or manifold hardware |
| Not Included Unless Listed | Pump pack, soft-start manifold, hydraulic fluid, hoses, quick disconnects, pressure gauge, brake valve, check valve, directional valve, valve coil, hydraulic motor, and operator hardware unless separately listed |
Also Known As / Related Part Numbers
- MX000659
- HySecurity MX000659
- Nice HySecurity MX000659
- HySecurity VALVE, RELIEF, EX, 1500 PSI
- HySecurity 1500 PSI relief valve
- HySecurity EX relief valve
- HySecurity soft start operators relief valve
- HySecurity hydraulic relief valve
- HySecurity pump pack relief valve
- HySecurity soft-start manifold relief valve
- HySecurity pressure relief valve
- HYS-MX000659, related distributor SKU format
- MX000174, related 3000 PSI relief valve, not the same part
- MX000657, related 3:1 counterbalance / brake valve, not the same part
- MX000171, related check valve, not the same part
- MX001257, related directional valve with manual function, not the same part
- MX000184, related directional valve coil, not the same part
- MX001276, related face down AWOG soft-start manifold kit, not the same part
- MX000618, related face down AWOG hose assembly, not the same part
Related Parts and Accessories
- mx001106-2000-psi-hydraulic-pressure-gauge-kit.html">HySecurity MX001106 2000 PSI pressure gauge kit where hydraulic pressure testing is required
- HySecurity MX000174 relief valve where the operator requires the related 3000 PSI relief valve instead
- mx000657-3-1-counterbalance-brake-valve.html">HySecurity MX000657 3:1 counterbalance / brake valve where braking or load-control valve service is required
- HySecurity MX000171 check valve where check valve service is required
- mx001257-2-position-manual-directional-valve-cartridge.html">HySecurity MX001257 directional valve where directional hydraulic control is being serviced
- HySecurity MX000184 24VDC directional valve coil where coil failure is the issue
- mx001276-face-down-awog-soft-start-manifold-kit.html">HySecurity MX001276 face down AWOG soft-start manifold kit where the full soft-start manifold is required
- mx000618-face-down-awog-hose-assembly.html">HySecurity MX000618 face down AWOG hose assembly where the AWOG hose assembly is the failed component
- Hydraulic fluid specified by the current HySecurity operator manual
- Hoses, quick disconnects, seals, fittings, and manifold parts where leakage or contamination is present
Technician Note
Relief valve problems should be diagnosed with a pressure gauge and the correct HySecurity service procedure. A gate that is weak, slow, chattering, or not moving may have a relief valve issue, but it may also have low fluid, contaminated fluid, a leaking hose, a worn hydraulic motor, bad quick disconnects, a weak pump pack, incorrect brake behavior, or mechanical gate drag.
Do not increase relief pressure to force a hard-moving gate to run. A dragging gate, damaged track, worn rollers, bad hinges, or poor alignment should be corrected mechanically. Raising pressure beyond the proper setting can damage hydraulic components and create unsafe gate operation.
Before Ordering, Confirm
- Confirm the needed HySecurity part number is MX000659.
- Confirm the existing part is described as VALVE, RELIEF, EX, 1500 PSI.
- Confirm the operator model and serial number.
- Confirm the operator parts diagram lists MX000659 for the relief valve location.
- Confirm the valve pressure rating is 1500 PSI.
- Confirm the valve cavity, adjustment style, pressure range, and hydraulic function match the original valve.
- Confirm the repair does not require a different relief valve such as MX000174.
- Confirm the issue is not caused by a counterbalance valve, brake valve, check valve, directional valve, valve coil, hose leak, hydraulic motor, pump pack, or mechanical gate problem.
- Confirm whether seals, O-rings, adjustment cap, fittings, instructions, or manifold hardware are included or must be ordered separately.
Installation and Service Notes
Hydraulic relief valve service should be performed with the operator disabled, the gate secured, and the hydraulic system handled according to the current HySecurity service procedure. Do not remove hydraulic valves from a pressurized circuit.
Keep the valve and manifold area clean during service. Dirt or metal particles inside a relief valve or manifold can cause sticking, leakage, chatter, poor pressure control, or inconsistent movement. After replacement, pressure should be checked with the proper gauge and the operator should be tested through full travel to confirm smooth movement, correct stopping, leak-free operation, and working safety devices.
Professional Advisory
Relief valve service can affect gate force, hydraulic pressure, and operator safety behavior. A qualified HySecurity gate technician should handle this repair if the operator is weak, chattering, overheating, leaking, tripping faults, or showing repeated hydraulic pressure problems.
Do not bypass pressure controls, brake valves, covers, guards, limits, monitored entrapment protection, photo eyes, safety edges, disconnects, or controller protections during hydraulic service. The operator should be fully tested after repair to confirm safe and predictable movement.
Product Questions & Answers
What is the HySecurity MX000659 used for?
The HySecurity MX000659 is a 1500 PSI hydraulic relief valve used in select HySecurity hydraulic gate operator systems where the parts diagram lists this valve.
What pressure rating is MX000659?
MX000659 is commonly listed as a 1500 PSI relief valve.
Is MX000659 the same as MX000174?
No. MX000659 is a 1500 PSI relief valve. MX000174 is a related 3000 PSI relief valve reference used in select HySecurity hydraulic systems. They are not interchangeable without parts-diagram confirmation.
Is MX000659 the same as MX000657?
No. MX000659 is a relief valve. MX000657 is a 3:1 counterbalance / brake valve. They perform different hydraulic functions and should not be substituted for each other.
Will MX000659 fix a weak or slow hydraulic gate operator?
It may help if the relief valve is the failed component, but weak movement can also be caused by low fluid, contaminated fluid, hose leaks, bad quick disconnects, weak pump output, hydraulic motor wear, brake valve problems, or gate drag.
Can I adjust this relief valve myself?
Relief valve adjustment affects hydraulic pressure, gate force, and operator safety behavior. It should be handled by a qualified HySecurity technician using the proper pressure gauge and current service procedure.
