How to choose a suitable GHP series Marzocchi gear pump?

Choosing a suitable GHP series Marzocchi ultra-high pressure gear pump requires comprehensive consideration of core factors such as pressure, flow, speed, medium, installation space and special needs. The following are the specific selection steps and precautions.：

1. Clarify the requirements for core parameters
   Pressure demand
   Continuous pressure: The pressure required for long-term operation of the system (such as 250 bar).
   Peak pressure: The maximum pressure of the system in a short period of time (such as 310 bar).
   Selection principle: The rated pressure of the pump needs to be greater than the continuous pressure of the system, and the peak pressure needs to cover the instantaneous high pressure requirements of the system.
   Example: If the system has a continuous pressure of 250 bar and a peak pressure of 300 bar, the GHP2 series (rated at 280 bar and peak at 310 bar) is optional.
   Traffic demand
   Calculation method: Flow rate (L/min) = displacement (cm3/rev) × rotation speed (rpm)÷1000.
   Selection principle: According to the required flow rate of the system and the motor speed, the displacement requirements are pushed back.
   Example: When the flow rate is 30 L/min and the speed is 1500 rpm, the displacement needs to be ≥20 cm3/rev. GHP2A-D-25-FG (displacement 25 cm3/rev) is optional.
   Speed matching
   Maximum speed: the GHP1 series is up to 6000 rpm, the GHP2 series is 4000 rpm, and the GHP3 series is 3500 rpm.
   Selection principle: The rated speed of the pump must be ≥ the speed of the drive motor to avoid wear caused by overspeed operation.
   Example: When the motor speed is 4000 rpm, the GHP2 series is preferred instead of the GHP3 series (rated at 3500 rpm).
2. Media compatibility assessment
   Media type
   Standard hydraulic oil: The GHP series supports mineral oil, bio-oil, etc. by default.
   Corrosive media: such as emulsions and chemical solutions, you need to choose a “W” (low-lubricating medium) or a special coating model (such as GHP2A-D-16-W-FG).
   High-temperature media: such as thermal oil, you need to confirm the temperature range of the pump (some models support -40°C to +120°C).
   Viscosity range
   The applicable viscosity range of GHP series is usually 10-400cSt (at 40°C), beyond which the supplier needs to be consulted.
3. Installation and structural adaptability
   Installation method
   Flange type: GHP series provides a variety of flange standards (such as ISO, DIN, SAE), which need to be matched with the equipment interface.
   Shaft extension form: such as flat key shaft, spline shaft, etc., must be compatible with the drive motor or coupling.
   Example: If the equipment adopts ISO 6162-1 flange, GHP2A-D-25-FG-ISO (model with ISO flange) is optional.
   Space constraints
   Measure the size of the installation space (length, width, height), and choose a compact model (such as GHP1 series) or a customized design.
4. Matching of special needs
   Noise control
   If low-noise operation is required, the GHP1 series (optimized gear tooth shape and low noise level) is preferred.
   High temperature/low temperature environment
   High temperature: Choose a model with the suffix ”V” (such as GHP2A-D-25-V-FG), which supports +120°C operating conditions.
   Low temperature: Choose models with the suffix ”ST” (such as GHP2A-D-25-ST-FG) to support -40°C operating conditions.
   Two-way rotation
   If you need a pump for forward and reverse transfer, you need to choose a two-way pump model or consult the supplier for customization (for example, some models of the ALP series support two-way).
5. Practical steps for selection
   Collect parameters: record system pressure, flow rate, speed, media type, temperature range, etc.
   Preliminary screening: Determine the series (GHP1/GHP2/GHP3) according to the pressure requirements, and then lock the displacement according to the flow rate and speed.
   Verify compatibility: Confirm that the medium, temperature, and installation method match the pump model.
   Consult suppliers: provide specific working conditions and obtain customized suggestions (such as sealing material upgrades, special coatings, etc.).
   Reference cases: Refer to application cases in the same industry (such as GHP3 series for construction machinery and GHP1 series for test machinery).
6. Common selection misunderstandings
   Ignore peak pressure: The instantaneous high pressure of the system may cause damage to the pump, and it is necessary to ensure that the peak pressure covers the demand.
   Displacement calculation error: The speed matching is not considered, resulting in insufficient or excess flow.
   Misjudgment of media compatibility: The sealing material and pump body coating are not confirmed, resulting in corrosion and leakage.
   Ignore the installation space: the size of the pump body is too large to be installed, and the space needs to be measured in advance.

Common models of GHP1 series gear pumps: GHP1, GHP1-T, GHP1-MU, GHP1A, GHP1AD-2, GHP1AD-3, GHP1AD-4, GHP1AD-5, GHP1AD-6, GHP1AD-7, GHP1AD-9, GHP1AD-11, GHP1AD-13, GHP1AD-16, GHP1AD20, etc.
Common models of GHP2 series gear pumps: GHP2, GHP2-T, GHP2-MU, GHP2A, GHP2A-KA, GHP2AD-6, GHP2AD-9, GHP2AD-10, GHP2AD-12, GHP2AD-13, GHP2AD-16, GHP2AD-20, GHP2AD-22, GHP2AD-25, GHP2AD-30, GHP2AD-34, GHP2AD-37, GHP2AD-40, GHP2AD-50, etc.
Common models of GHP3 series gear pumps: GHP3, GHP3-MU, GHP3A, GHP3A-MU, GHP3A2, GHP3BK1, GHP35, GHP3-D-30, GHP3-D-33, GHP3-D-40, GHP3-D-50, GHP3-D-60, GHP3-D-66, GHP3-D-80, GHP3-D-94, GHP3-D -110, GHP3-D-120, GHP3-D-135, etc.
Other special models: GHPID series: such as GHPID2, GHPID3, GHPID4, GHPID-5, GHPID6, GHPID7, etc.GHPBK series: such as GHP2BK1-D6, GHP2BK1-D9, GHP2BK1-D-10, etc.，