Hydraulic Self Cleaning Filter Manual
Table of Contents
Manual Overview
SN Series Hydraulic Drive Filter Operation Manual
I. Equipment Introduction
A. Product Positioning
The SN series hydraulically driven filter (represented by the SN series) is an energy-free, self-driven hydraulic filtration device . Its core advantage lies in its ability to remove impurities by utilizing the physical property of water pressure without the need for electrical control. It is an energy-saving and environmentally friendly water treatment device, suitable for various water treatment projects such as agricultural irrigation, metallurgical industry, petrochemical industry, and municipal engineering, and is especially suitable for scenarios where power supply is difficult
B. Core Features
- Zero energy consumption: No external power is required; it is driven solely by water pressure, thus reducing energy consumption.
- Easy to maintain: The simple structural design makes daily maintenance convenient and reduces maintenance costs;
- Long lifespan: The equipment's materials and structure are adapted to various water qualities across industries, resulting in a long service life;
- Widely compatible: It can be used in circulating/non-circulating cooling water systems, heat exchange systems, central air conditioning systems, centralized heating systems, hot water boiler systems, etc., to protect core components such as cooling equipment, heat exchange devices, air conditioners, and boilers, covering industries such as construction, chemical, power, metallurgy, rubber, papermaking, textile, coal, and food.
II. Working Principle
A. Filtration process
Raw water enters from the equipment inlet and passes through a coarse filter (for initial filtration of large particles) and a fine filter (for deep filtration of fine particles) in sequence, finally flowing out from the outlet to complete water purification.
B. Cleaning process (backwashing mechanism)
- Differential pressure trigger: After the equipment has been running for a period of time, impurities accumulate on the inside of the fine filter screen, causing the pressure difference between the inlet and outlet to increase; when the differential pressure reaches the set limit, the differential pressure sensor (differential pressure switch) sends a signal;
- Water circuit switching: After receiving the signal, the electronic controller controls the solenoid valve to switch the water circuit, and the hydraulic piston pushes the suction cylinder to start the double cleaning.
- Spiral cleaning: The water flow drives the hydraulic motor to rotate, which in turn drives the suction cylinder to make a spiral motion , fully covering the inner surface of the fine filter screen and thoroughly removing impurities;
- Impurity removal: Impurities generated during cleaning are discharged through the drain valve ;
- Cycle recovery: until the pressure difference between the inlet and outlet ends drops below the set value, the drain valve closes and the equipment returns to normal filtration status;
- Control methods: Supports three online backwashing modes: differential pressure control, time control, and manual control , ensuring reliable backwashing and uninterrupted normal filtration during backwashing (Note: The principles of M-type, V-type, and L-type are basically the same)
III. Technical parameters (taking SNM model as an example)
Filter installation diagram
A. Core Technical Parameter Table
| Parameter categories | Parameter value |
| -------------------- | --------------- |
| Single unit traffic | 80~380t/h or refer to the parameter table |
| Minimum working pressure | 2.5 bar |
| Maximum working pressure | 8bar |
| Maximum operating temperature | 60℃ |
| Filtration accuracy | 120 microns or customized according to customer requirements |
| Control method | Electronic control / hydraulic control |
| Controller backwashing method | Differential pressure, time and manual |
| Power supply for electrical control system | Two AA dry cell batteries (1.5V x 2, total 3V) |
| Battery life | , it lasts 6-12 months (adjusted depending on backwashing frequency). |
B. Specifications and detailed parameters (Table 2-8)
| model | Pipe diameter (mm) | Filter flow rate (t/h) | Filter area (cm²) | Maximum working pressure (bar) | Minimum operating pressure (bar) | Controller / Differential Pressure Switch (Solenoid Valve) | Weight (kg) |
| ----- | ------------------ | ---------------------- | ----------------- | ------------------------------ | -------------------------------- | ---------------------------------------------------------- | ----------- |
| SNM 4E-A | 100 | 80 | 2634 | 8 | 2.5 | BACCARA | 72 |
| SNM4E-B | 100 | 100 | 3951 | 8 | 2.5 | BACCARA | 83 |
| SNM5E-A | 125 | 140 | 3951 | 8 | 2.5 | BACCARA | 85 |
| SNM5-B | 125 | 150 | 5268 | 8 | 2.5 | BACCARA | 92 |
| SNM6E-A | 150 | 180 | 5268 | 8 | 2.5 | BACCARA | 95 |
| SNM6E-B | 150 | 220 | 7902 | 8 | 2.5 | BACCARA | 135 |
| SNM8E | 200 | 320 | 7902 | 8 | 2.5 | BACCARA | 142 |
| SNM10E | 250 | 380 | 7902 | 8 | 2.5 | BACCARA | 154 |
C. Installation Dimensions Table (Table 2-9, for SNM type filters)
| model | L (mm) | A (mm) | B (mm) | D (mm) |
| ----- | ------ | ------ | ------ | ------ |
| SNM 4E-A | 1600 | 500 | 287 | 273 |
| SNM 4E-B | 1800 | 600 | 287 | 273 |
| SNM 5E-A | 1800 | 600 | 287 | 273 |
| SNM 5-B | 2110 | 900 | 287 | 273 |
| SNM 6E-A | 2110 | 900 | 287 | 273 |
| SNM 6E-B | 2502 | 1100 | 312 | 273 |
| SNM 8E | 2502 | 1100 | 312 | 273 |
| SNM 10E | 2502 | 1100 | 312 | 325 |
D. Installation diagram
- (See attached diagram in the reference document: SNM filter installation diagram, including the assembly relationships of components such as axial pressure gauge, filter element integration, cylinder assembly, control system integration, cap nut, hex socket set screw, piston system integration, hose, quick-connect elbow, etc.)
- ( Detailed image of the controller battery compartment, labeled: battery compartment cover , battery mounting slot (for two AA batteries), positive and negative markings, and cover securing clips)
IV. Electrical Control System Description
A. Electrical Control Principle
The core function of the SN series water-driven filter's electrical control system is backwash control, which requires two AA dry batteries (3V) for power and supports two operating modes :
- Automatic operation: includes "time-cycle backwashing" (backwashing starts at preset time intervals, requiring power to maintain the timing function) and "differential pressure backwashing" (backwashing starts at inlet and outlet differential pressure thresholds, requiring power to support sensor signal transmission and controller command output) ;
- Manual backwash: The backwash process is triggered by manual operation (no power required, but manual operation is the only option when the automatic control function fails), suitable for emergency cleaning scenarios.
B. Core Components and Applications
- Controller: Standard controller receives signals from differential pressure sensor, controls the operation of solenoid valve and drain valve, and coordinates the backwashing process;
- Solenoid valve: Its core function is to switch the direction of water flow, guide the water flow through the coarse filter element (to remove large particles of impurities) and the fine filter screen (to remove small particles of impurities) in sequence, and cooperate with the hydraulic motor to drive the suction pipe during backwashing;
- Differential pressure sensor (differential pressure switch): Real-time monitoring of the pressure difference between the inside and outside of the fine filter screen. When the pressure difference reaches the preset value, it sends a backwash trigger signal to the controller.
- Rotates the suction pipe .
- Hydraulic cylinder: Drives the suction pipe to move axially via a hydraulic piston;
- Sewage suction assembly: Combining rotation and axial movement, it achieves full coverage cleaning of the inner surface of the fine filter, ensuring thorough removal of impurities.
C. Details of the electronic control process
- Power Preparation: Open the battery compartment cover on the side of the controller , insert two AA batteries according to the positive and negative markings inside the compartment, and tighten the cover to ensure good power contact. The controller will perform a self-test upon power-on (the indicator light will illuminate for 10 seconds and then turn off, entering standby mode).
- Filtration Stage: The solenoid valve maintains normal water flow (the controller's power supply ensures stable valve operation). Water flows through the coarse and fine filters and exits through the outlet pipe, where impurities gradually accumulate on the inside of the fine filter screen.
- Backwash Trigger: The differential pressure sensor detects that the differential pressure has reached the target level (power supply is required for sensor operation) and sends a signal to the controller.
- Backwash Execution: After receiving the signal (relying on battery power), the controller controls the solenoid valve to open the drain valve. The water flow drives the hydraulic motor to rotate, and simultaneously, the hydraulic cylinder moves the suction pipe axially, thoroughly cleaning the filter screen. Impurities are discharged with the water flow from the drain valve (cleaning lasts for tens of seconds, and power is required throughout the process to maintain the solenoid valve's operation).
- Recovery phase: After cleaning, the controller closes the drain valve, the water pressure rises and pushes the hydraulic cylinder piston to reset, and the equipment enters the next filtration cycle (normal filtration is uninterrupted throughout the process, and the controller continuously monitors the equipment status by relying on battery power).
V. Installation and Debugging
A. Preparations before installation
- Read this instruction manual carefully to understand the functions and assembly requirements of the equipment components (axial pressure gauge, filter element integration, cylinder assembly, control system integration, cap nut, hex socket set screw, piston system integration, hose, quick-connect elbow);
- Confirm that the installation location meets the following conditions:
- The filter should be placed near the core components that need protection and near the pressure source to avoid low pressure at the filter inlet before and after backwashing.
- Sufficient operating space should be reserved to facilitate subsequent maintenance (especially space should be reserved above the end cap to pull out internal components).
- Keep away from areas prone to water hammer or backflow (if this cannot be avoided, an additional check valve must be installed at the outlet).
- If filtering hot water, a scalding protection device must be provided in advance.
B. Installation Precautions
| Precautions Category | Specific requirements |
| -------------------- | --------------------- |
| Pressure and pipe diameter requirements | must be equal to the diameter of the filter inlet pipe. |
| Valve installation requirements | An inlet valve, an outlet valve, and a bypass valve must be installed; a check valve (to prevent water hammer/backflow) should be installed at the outlet as needed. |
| Sewage pipe installation requirements | at the outlet of the drain valve before connecting the drain pipe; the drain pipe is 5-15m long, with no upward slope, few bends, and no vibration during flushing at the end opening. |
| Flow direction and safety requirements | The filter flow direction indicator should be aligned with the system water flow direction; ensure the equipment is securely connected to the lifting device during hoisting, and strictly prohibit anyone from standing under the hoisting equipment; operators must wear safety helmets. |
| Maintenance space requirements | Sufficient space is provided above the end cap for easy removal of internal components; the equipment is free of obstructions for convenient routine maintenance. |
C. Mechanical Part Installation Steps
- Piping connection: Connect the inlet and outlet pipes to the corresponding inlet and outlet ends of the filter, respectively, and use flange connections to ensure a seal;
- Valve assembly: Install the inlet valve, outlet valve, and bypass valve in sequence. If water hammer/backflow is required, install a check valve at the outlet end .
- Sewage system installation: Install a shut-off valve at the outlet of the sewage valve , and then connect a sewage pipe that meets the length and direction requirements;
- Component inspection: Confirm that all flange connections are secure, valves operate smoothly, drain pipes are unblocked , and hoses and quick-connect elbows are tightly connected without leakage.
D. Debugging process
- Pressure test: Slowly open the inlet valve and observe whether the inlet pressure is stable above 2.5 bar (minimum working pressure) to confirm that there is no pipeline leakage;
- Flow direction verification: Open the outlet valve and observe whether the water flow is consistent with the flow direction mark on the equipment to ensure that the filtration process is normal;
- Backwash test: Trigger a backwash cycle manually using the button and check the following items:
Is the drain valve open/closed properly?
Check if the hydraulic motor and suction pipe are moving normally (rotation + axial movement);
After backwashing, has the differential pressure returned to below the set value? - Electrical control test: Test "time backwash" (set a short cycle and observe whether it starts on time) and "differential pressure backwash" (artificially add impurities to the filter and observe whether it automatically triggers after the differential pressure reaches the standard) to ensure that the two automatic modes operate normally.
VI. Maintenance and Care
A. Routine check-ups (once a week)
- Electrical control system inspection (including power supply status):
Observe the controller indicator lights: If the indicator lights are flashing, it indicates that the battery power is low and two AA batteries need to be replaced immediately.
Manual backwash trigger: Press the "Manual backwash" button to confirm that the controller can normally command the drain valve to operate (verify that the power supply and electrical control functions are normal). - Cleaning equipment inspection:
Open the low-pressure chamber of the differential pressure switch to release the accumulated water (or press the manual backwash button directly) to trigger an automatic backwash cycle;
Observe the drain valve: whether it opens normally during backwashing and whether impurities are discharged smoothly;
Observe the recovery status: After backwashing, check whether the drain valve is closed in time and whether the equipment has returned to normal filtration .
B. Long-term shutdown for maintenance (shutdown for more than 1 month )
1. Pre-discontinuation processing
- Initiate a complete backwash cycle (if conditions permit, close the inlet valve first to reduce residual impurities on the filter screen);
- Remove the two AA batteries from the controller's battery compartment (to prevent battery leakage and corrosion of internal components due to prolonged storage) ;
- Cut off the water supply to the equipment: Close the inlet valve and outlet valve, and slowly open the drain valve to release the internal pressure of the equipment ;
- Clean the controller surface: Wipe the controller and battery compartment with a dry cloth to prevent dust buildup.
2. Restart preprocessing
- Cleaning and inspection: Wipe the surface of the equipment and the controller, and check the battery compartment for corrosion (if any, clean it with a dry cloth before installing the battery) ;
- Power restoration: Insert two new AA batteries (place them according to the positive and negative markings), tighten the cover , and confirm that the controller is powered on and performs a normal self-test (the indicator light will be on for 10 seconds) ;
- Equipment inspection: Manually trigger the backwash cycle and check whether the suction pipe, hydraulic motor, and drain valve operate smoothly.
- Water circuit restoration: Open the inlet valve and outlet valve, observe whether the inlet and outlet pressures are stable, and after confirming that there is no leakage, switch to automatic operation mode
C. Routine maintenance (once a year)
- Leakage Inspection: Conduct a comprehensive inspection of the equipment shell, flange interfaces, valves, and hose connections for leaks. If leaks are found:
Disassemble the corresponding parts and check whether the seals (such as gaskets) are aged or damaged;
Replace damaged parts and ensure proper sealing during reassembly; - Controller check: With the filtered water source in operation, test the controller's "differential pressure backwash" and "time backwash" functions to confirm that signal reception and command transmission are normal.
- Filter cartridge assembly inspection: Disassemble the filter cartridge assembly and inspect the coarse and fine filters for damage or blockage.
If it is just a blockage, backflush with high pressure water (avoid scraping with hard objects to prevent damage to the filter).
If the filter screen is damaged, replace it with a filter element of the same specification to ensure that the filtration accuracy does not decrease. - Component fastening check: Check whether the connecting parts such as the hex socket set screws and cap nuts are loose. If they are loose, tighten them again according to the torque requirements in the instruction manual.
This section provides comprehensive documentation for all products in the Hydraulic Self Cleaning Filter category. Please select a specific product below to view its detailed manual.
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Carbon Steel-12"-Hydraulic Self-cleaning Filter
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