{"id":646,"date":"2026-06-05T13:17:41","date_gmt":"2026-06-05T05:17:41","guid":{"rendered":"https:\/\/cg.0553.site\/?post_type=product&#038;p=646"},"modified":"2026-06-05T16:10:04","modified_gmt":"2026-06-05T08:10:04","slug":"hpl-vfd-pump","status":"publish","type":"product","link":"https:\/\/cg.0553.site\/de\/produkt\/hpl-vfd-pump\/","title":{"rendered":"HPLE Variable Speed Inline Pump"},"content":{"rendered":"<p>If you are still controlling pump output with throttle valves or bypass lines, you are paying for energy that produces no useful work.<\/p>\n<p>Every kilowatt-hour consumed to overcome unnecessary system pressure is money thrown away \u2014 and in facilities where pumps run thousands of hours per year, those losses compound into staggering sums.<\/p>\n<p>The\u00a0<strong>HPLE variable speed inline pump<\/strong>\u00a0from Hongjiu eliminates this waste at its source. By integrating a high-quality variable frequency drive (VFD) directly into the pump assembly, the HPLE adjusts motor speed automatically to match actual system demand \u2014 delivering only the pressure and flow the system needs, nothing more.<\/p>\n<p>The result? Energy savings of\u00a0<strong>20\u201340%<\/strong>\u00a0compared with conventional fixed-speed control strategies, with typical payback periods of 1\u20133 years. After that, every saved kilowatt-hour goes straight to your bottom line.<\/p>\n<h2 id=\"why-variable-speed-control-beats-throttle-valves-every-time\"><a id=\"1\" class=\"mdr-anchor\" href=\"#why-variable-speed-control-beats-throttle-valves-every-time\" aria-hidden=\"true\"><\/a>Why Variable Speed Control Beats Throttle Valves Every Time<\/h2>\n<p>To understand why a\u00a0<strong>variable speed inline pump<\/strong>\u00a0delivers such dramatic savings, it helps to look at how traditional systems waste energy. In a typical fixed-speed pumping installation, the pump runs at constant full speed regardless of actual demand. When the system needs less flow, excess pressure is dissipated through a control valve or bypass line.<\/p>\n<p>This is analogous to driving your car with the accelerator pedal pressed to the floor while controlling speed with the brake. The engine burns maximum fuel regardless of how fast you are actually going.<\/p>\n<p>The VFD in the HPLE works differently. It follows the pump\u00a0<strong>affinity laws<\/strong>, which describe the mathematical relationship between speed, flow, head, and power:<\/p>\n<ul>\n<li>Flow is proportional to speed (Q \u221d n)<\/li>\n<li>Head is proportional to speed squared (H \u221d n\u00b2)<\/li>\n<li>Power is proportional to speed cubed (P \u221d n\u00b3)<\/li>\n<\/ul>\n<p>The cubic relationship is the key insight here:\u00a0<strong>reducing motor speed by just 20% cuts power consumption by approximately 50%.<\/strong>\u00a0This is not marginal efficiency improvement \u2014 it is a fundamental shift in how pumping energy is used.<\/p>\n<h2 id=\"integrated-vfd-engineering--built-for-reliability\"><a id=\"2\" class=\"mdr-anchor\" href=\"#integrated-vfd-engineering--built-for-reliability\" aria-hidden=\"true\"><\/a>Integrated VFD Engineering \u2014 Built for Reliability<\/h2>\n<p>Not all VFD-equipped pumps are created equal. The quality of the drive unit determines everything from energy-saving performance to long-term reliability. Hongjiu has selected VFD partners based on proven field track record, not lowest purchase price.<\/p>\n<table>\n<thead>\n<tr>\n<th>Power Range<\/th>\n<th>VFD Brand<\/th>\n<th>Rationale<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Models \u2265 3 kW<\/td>\n<td><strong>Inovance<\/strong><\/td>\n<td>China\u2019s largest VFD manufacturer; MTBF &gt;50,000 hours; global installations in millions of industrial\/commercial applications<\/td>\n<\/tr>\n<tr>\n<td>Models &lt; 3 kW<\/td>\n<td><strong>Huizhi<\/strong><\/td>\n<td>Compact, cost-effective drive optimized for small-horsepower pump applications; reliable performance in space-efficient package<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"why-inovance-for-larger-models\"><a id=\"3\" class=\"mdr-anchor\" href=\"#why-inovance-for-larger-models\" aria-hidden=\"true\"><\/a>Why Inovance for Larger Models<\/h3>\n<p>Hongjiu is recognized globally as a leader in industrial automation and drive technology. Their VFDs used in the HPLE series offer:<\/p>\n<ul>\n<li><strong>Wide voltage tolerance<\/strong>\u00a0with strong grid adaptability \u2014 important for facilities with unstable supply power<\/li>\n<li><strong>Comprehensive built-in protections<\/strong>\u00a0including overcurrent, overvoltage, undervoltage, overheating, phase loss, and dry-run detection<\/li>\n<li><strong>Full-featured PID control<\/strong>\u00a0for precise pressure or flow regulation without an external controller<\/li>\n<li><strong>Modbus RTU communication<\/strong>\u00a0(RS485) standard for integration into building management systems<\/li>\n<\/ul>\n<h3 id=\"rainproof-enclosure--install-anywhere\"><a id=\"4\" class=\"mdr-anchor\" href=\"#rainproof-enclosure--install-anywhere\" aria-hidden=\"true\"><\/a>Rainproof Enclosure \u2014 Install Anywhere<\/h3>\n<p>Every HPLE model ships with a\u00a0<strong>rainproof enclosure<\/strong>\u00a0rated for outdoor or semi-outdoor installation. This eliminates the need for a separate electrical cabinet in many applications, reducing panel costs, wiring runs, and installation labor.<\/p>\n<p>The enclosure protects VFD electronics from rain, splashing, and condensation while maintaining adequate airflow for cooling \u2014 a design balance that many competitors struggle to achieve.<\/p>\n<h2 id=\"technical-specifications\"><a id=\"5\" class=\"mdr-anchor\" href=\"#technical-specifications\" aria-hidden=\"true\"><\/a>Technical Specifications<\/h2>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Series<\/td>\n<td>HPLE (VFD-Equipped)<\/td>\n<\/tr>\n<tr>\n<td>Base Pump Platform<\/td>\n<td>HPL vertical direct-connect inline pump<\/td>\n<\/tr>\n<tr>\n<td>Flow Range<\/td>\n<td>4 \u2013 170 m\u00b3\/h<\/td>\n<\/tr>\n<tr>\n<td>Head Range<\/td>\n<td>4 \u2013 47.5 m<\/td>\n<\/tr>\n<tr>\n<td>Nominal Diameter<\/td>\n<td>DN25 \u2013 DN80<\/td>\n<\/tr>\n<tr>\n<td>Standard Pressure Rating<\/td>\n<td>1.6 MPa (16 bar)<\/td>\n<\/tr>\n<tr>\n<td>Optional High Pressure<\/td>\n<td>2.5 MPa (25 bar)<\/td>\n<\/tr>\n<tr>\n<td>Medium Temperature Range<\/td>\n<td>-25\u00b0C to +110\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Primary Power Supply<\/td>\n<td>3\u00d7380\u2013415V 50Hz (three-phase)<\/td>\n<\/tr>\n<tr>\n<td>Single-Phase Option<\/td>\n<td>1\u00d7220\u2013240V, max 2.2 kW<\/td>\n<\/tr>\n<tr>\n<td>Motor Efficiency Class<\/td>\n<td>IE2 \/ IE3<\/td>\n<\/tr>\n<tr>\n<td>Bearing Brand<\/td>\n<td>NSK \/ SKF (sealed for life)<\/td>\n<\/tr>\n<tr>\n<td>Speed Control Range<\/td>\n<td>20\u201360 Hz typical<\/td>\n<\/tr>\n<tr>\n<td>VFD Communication<\/td>\n<td>Modbus RTU (RS485), built-in keypad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"performance-snapshot--selected-models\"><a id=\"6\" class=\"mdr-anchor\" href=\"#performance-snapshot--selected-models\" aria-hidden=\"true\"><\/a>Performance Snapshot \u2014 Selected Models<\/h2>\n<table>\n<thead>\n<tr>\n<th>Model<\/th>\n<th>Power (kW)<\/th>\n<th>Max Flow (m\u00b3\/h)<\/th>\n<th>Max Head (m)<\/th>\n<th>VFD Brand<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>HPLE25\/105-11\/11-0.75\/2<\/td>\n<td>0.75<\/td>\n<td>11<\/td>\n<td>11<\/td>\n<td>Huizhi<\/td>\n<\/tr>\n<tr>\n<td>HPLE32\/135-14\/18-1.5\/2<\/td>\n<td>1.5<\/td>\n<td>14<\/td>\n<td>18<\/td>\n<td>Huizhi<\/td>\n<\/tr>\n<tr>\n<td>HPLE40\/160-30\/40-5.5\/2<\/td>\n<td>5.5<\/td>\n<td>30<\/td>\n<td>40<\/td>\n<td>Inovance<\/td>\n<\/tr>\n<tr>\n<td>HPLE50\/160-33\/70-11\/2<\/td>\n<td>11<\/td>\n<td>33<\/td>\n<td>70<\/td>\n<td>Inovance<\/td>\n<\/tr>\n<tr>\n<td>HPLE65\/150-32\/90-11\/2<\/td>\n<td>11<\/td>\n<td>32<\/td>\n<td>90<\/td>\n<td>Inovance<\/td>\n<\/tr>\n<tr>\n<td>HPLE80\/125-20\/150-11\/2<\/td>\n<td>11<\/td>\n<td>20<\/td>\n<td>150<\/td>\n<td>Inovance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><strong>Note:<\/strong>\u00a0Performance values shown represent maximums at rated speed (50 Hz). Actual operating points vary based on system resistance curve and VFD setpoint configuration. Contact our engineering team for duty-point-specific performance data.<\/p><\/blockquote>\n<h2 id=\"constant-pressure-control-the-smart-way-to-manage-water-supply\"><a id=\"7\" class=\"mdr-anchor\" href=\"#constant-pressure-control-the-smart-way-to-manage-water-supply\" aria-hidden=\"true\"><\/a>Constant Pressure Control: The Smart Way to Manage Water Supply<\/h2>\n<p>One of the most valuable features of the\u00a0<strong>variable speed inline pump<\/strong>\u00a0is its ability to maintain constant discharge pressure regardless of how much water the system is actually drawing. This capability transforms how buildings manage their domestic water supply:<\/p>\n<h3 id=\"how-constant-pressure-works\"><a id=\"8\" class=\"mdr-anchor\" href=\"#how-constant-pressure-works\" aria-hidden=\"true\"><\/a>How Constant Pressure Works<\/h3>\n<ol>\n<li>A pressure sensor (installed on the discharge piping or at a remote point) measures the actual system pressure<\/li>\n<li>The VFD\u2019s built-in\u00a0<strong>PID controller<\/strong>\u00a0compares the measured pressure against your setpoint<\/li>\n<li>If pressure is below setpoint, the VFD increases motor speed; if above, it decreases speed<\/li>\n<li>The adjustment happens continuously and smoothly \u2014 no sudden pressure spikes or drops<\/li>\n<\/ol>\n<h3 id=\"why-this-matters-for-your-facility\"><a id=\"9\" class=\"mdr-anchor\" href=\"#why-this-matters-for-your-facility\" aria-hidden=\"true\"><\/a>Why This Matters for Your Facility<\/h3>\n<p>For hotels, hospitals, apartment buildings, and commercial offices, water demand fluctuates dramatically throughout the day. Morning shower peaks, lunchtime kitchen demand, evening occupancy patterns \u2014 each creates a different load profile. With a fixed-speed pump, you either maintain constant pressure by wasting energy through a pressure-reducing valve, or you accept pressure fluctuations that affect tenant comfort.<\/p>\n<p>The HPLE\u2019s constant pressure mode gives you both: stable pressure at all demand levels, and energy consumption that scales proportionally with actual usage.<\/p>\n<h2 id=\"water-shortage-protection-built-in\"><a id=\"10\" class=\"mdr-anchor\" href=\"#water-shortage-protection-built-in\" aria-hidden=\"true\"><\/a>Water Shortage Protection Built In<\/h2>\n<p>Running a pump dry is one of the fastest ways to destroy a mechanical seal and damage bearings. The HPLE\u2019s integrated VFD includes\u00a0<strong>dry-run protection<\/strong>\u00a0as a standard feature:<\/p>\n<ul>\n<li>The drive monitors motor current and operating parameters for signatures indicating dry-running conditions<\/li>\n<li>Upon detecting potential dry-run, the VFD stops the motor and triggers a fault alarm<\/li>\n<li>Configurable auto-restart allows the pump to resume operation once water supply is restored<\/li>\n<li>This protection operates without requiring an external level sensor (though external sensors can be integrated for additional reliability)<\/li>\n<\/ul>\n<p>For unattended installations \u2014 remote booster stations, rooftop tanks, automated process loops \u2014 this built-in protection provides peace of mind that a standalone fixed-speed pump simply cannot match.<\/p>\n<h2 id=\"energy-savings-in-real-scenarios\"><a id=\"11\" class=\"mdr-anchor\" href=\"#energy-savings-in-real-scenarios\" aria-hidden=\"true\"><\/a>Energy Savings in Real Scenarios<\/h2>\n<p>Theory is useful, but what do the savings actually look like in practice? Here are two representative scenarios based on real-world HPLE installations:<\/p>\n<h3 id=\"scenario-1-hotel-domestic-water-boosting\"><a id=\"12\" class=\"mdr-anchor\" href=\"#scenario-1-hotel-domestic-water-boosting\" aria-hidden=\"true\"><\/a>Scenario 1: Hotel Domestic Water Boosting<\/h3>\n<p>A mid-sized hotel with 200 rooms experiences dramatic daily demand variation \u2014 from 30% of rated capacity during low-occupancy nighttime hours to nearly 100% during morning and evening peak periods.<\/p>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Fixed-Speed System<\/th>\n<th>HPLE Variable Speed System<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Demand Pattern<\/td>\n<td>40\u2013100% of rated flow<\/td>\n<td>Same profile<\/td>\n<\/tr>\n<tr>\n<td>Control Method<\/td>\n<td>Pressure-reducing valve (wastes excess head)<\/td>\n<td>VFD speed modulation<\/td>\n<\/tr>\n<tr>\n<td>Annual Energy Use (baseline)<\/td>\n<td>100%<\/td>\n<td>60\u201375%<\/td>\n<\/tr>\n<tr>\n<td>Estimated Annual Savings<\/td>\n<td>\u2014<\/td>\n<td><strong>25\u201340% reduction<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Payback on VFD Premium<\/td>\n<td>\u2014<\/td>\n<td>1.5 \u2013 2.5 years<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"scenario-2-hvac-chilled-water-circulation\"><a id=\"13\" class=\"mdr-anchor\" href=\"#scenario-2-hvac-chilled-water-circulation\" aria-hidden=\"true\"><\/a>Scenario 2: HVAC Chilled Water Circulation<\/h3>\n<p>A commercial office building chilled water system experiences seasonal load variation \u2014 from 100% cooling load in peak summer to 50% or less during spring and autumn shoulder seasons.<\/p>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Fixed-Speed (Two-Speed or Throttle)<\/th>\n<th>HPLE with Temperature Feedback<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Seasonal Load Range<\/td>\n<td>50\u2013100% cooling load<\/td>\n<td>Same demand profile<\/td>\n<\/tr>\n<tr>\n<td>Control Method<\/td>\n<td>Manual switching or throttle valve<\/td>\n<td>VFD modulates per chiller staging signal<\/td>\n<\/tr>\n<tr>\n<td>Annual Energy Use (baseline)<\/td>\n<td>100%<\/td>\n<td>55\u201370%<\/td>\n<\/tr>\n<tr>\n<td>Estimated Annual Savings<\/td>\n<td>\u2014<\/td>\n<td><strong>30\u201345% reduction<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Payback on VFD Premium<\/td>\n<td>\u2014<\/td>\n<td>1.0 \u2013 2.0 years<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In both scenarios, once the VFD premium pays back through electricity savings, every subsequent year of operation delivers pure cost reduction that compounds for the remaining service life of the equipment.<\/p>\n<h2 id=\"multiple-control-modes-for-every-application-architecture\"><a id=\"14\" class=\"mdr-anchor\" href=\"#multiple-control-modes-for-every-application-architecture\" aria-hidden=\"true\"><\/a>Multiple Control Modes for Every Application Architecture<\/h2>\n<p>The HPLE\u2019s integrated VFD supports several control strategies to match different system requirements:<\/p>\n<p><strong>Constant Pressure Control (PID)<\/strong>\u00a0\u2014 Maintains fixed discharge pressure regardless of flow variation using feedback from a pressure transmitter. Ideal for domestic water boosting and pressure-maintaining systems.<\/p>\n<p><strong>Constant Temperature Control<\/strong>\u00a0\u2014 Adjusts pump speed based on temperature sensor input. Perfect for HVAC chilled water and heating circulation systems where temperature is the controlled variable.<\/p>\n<p><strong>Constant Flow Control<\/strong>\u00a0\u2014 Maintains fixed flow rate via flow meter feedback. Used in process applications requiring precise delivery volumes.<\/p>\n<p><strong>Multi-Pump Parallel Control<\/strong>\u00a0\u2014 For installations running multiple HPLE units together, external controller options support master-follower cascade operation with automatic lead\/lag alternation and duty rotation for balanced equipment wear.<\/p>\n<h2 id=\"applications-where-the-variable-speed-inline-pump-delivers-maximum-value\"><a id=\"15\" class=\"mdr-anchor\" href=\"#applications-where-the-variable-speed-inline-pump-delivers-maximum-value\" aria-hidden=\"true\"><\/a>Applications Where the Variable Speed Inline Pump Delivers Maximum Value<\/h2>\n<p>The HPLE excels wherever flow or pressure demand varies significantly over time:<\/p>\n<ul>\n<li><strong>Commercial water supply<\/strong>\u00a0\u2014 Hotels, hospitals, shopping malls, and office buildings with variable occupancy patterns<\/li>\n<li><strong>Residential boosting<\/strong>\u00a0\u2014 Apartment complexes with pronounced morning\/evening peak demand<\/li>\n<li><strong>HVAC systems<\/strong>\u00a0\u2014 Chilled water and heating circulation with seasonal and daily load variation<\/li>\n<li><strong>District heating secondary loops<\/strong>\u00a0\u2014 Heat demand that follows weather patterns<\/li>\n<li><strong>Solar thermal circulation<\/strong>\u00a0\u2014 Variable-speed operation matching solar irradiance levels<\/li>\n<li><strong>Industrial process water<\/strong>\u00a0\u2014 Batch processes, cleaning circuits, and cooling systems with intermittent demand<\/li>\n<\/ul>\n<h2 id=\"quality-assurance-from-factory-to-field\"><a id=\"16\" class=\"mdr-anchor\" href=\"#quality-assurance-from-factory-to-field\" aria-hidden=\"true\"><\/a>Quality Assurance from Factory to Field<\/h2>\n<p>Every HPLE\u00a0<strong>variable speed inline pump<\/strong>\u00a0leaves Hongjiu\u2019s ISO 9001:2015 certified facility having passed:<\/p>\n<ul>\n<li>Hydrostatic pressure testing at 1.5\u00d7 rated pressure on the wet end<\/li>\n<li>Full-load VFD functional testing including PID tuning verification<\/li>\n<li>Performance curve confirmation on calibrated test rigs<\/li>\n<li>Bearing authenticity verification (NSK\/SKF from authorized channels)<\/li>\n<li>Electrical safety and insulation resistance testing<\/li>\n<li>Rainproof enclosure integrity validation<\/li>\n<\/ul>\n<h2 id=\"ready-to-calculate-your-savings\"><a id=\"17\" class=\"mdr-anchor\" href=\"#ready-to-calculate-your-savings\" aria-hidden=\"true\"><\/a>Ready to Calculate Your Savings?<\/h2>\n<p>Converting from fixed-speed to variable-speed pumping is one of the highest-ROI energy investments available to facility operators. Our engineering team can provide a complimentary energy savings analysis for your specific application, including projected annual savings, payback period calculation, and VFD configuration recommendations.<\/p>\n<p><a href=\"\/de\/contact\/\">Request your free energy analysis<\/a> |\u00a0<a href=\"\/de\/contact\/\">Speak with an application engineer<\/a><\/p>\n<h2 id=\"related-products\"><a id=\"18\" class=\"mdr-anchor\" href=\"#related-products\" aria-hidden=\"true\"><\/a>Related Products<\/h2>\n<ul>\n<li><a href=\"https:\/\/cg.0553.site\/de\/produkt-kategorie\/hpl-vertical-direct-connect-pump\/\">HPL Series Overview<\/a>\u00a0\u2014 Complete family comparison across all three variants<\/li>\n<li><a href=\"\/de\/hpl-standard-pump\/\">HPL Standard Pump<\/a>\u00a0\u2014 Fixed-speed variant for constant-duty applications<\/li>\n<li><a href=\"\/de\/hpl-pm-pump\/\">HPLYE Permanent Magnet Pump<\/a>\u00a0\u2014 Ultra-efficient PM VFD variant with even greater energy savings (up to 50%)<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p><strong>The HPLE variable speed inline pump<\/strong>\u00a0integrates an Inovance VFD (\u22653 kW) into a rainproof enclosure, enabling 20\u201340% energy savings with automatic constant-pressure PID control \u2014 no external electrical cabinet required, suitable for indoor or outdoor installation. Built on the HPL through-shaft platform for zero alignment maintenance and compact DN80 footprint.<\/p>","protected":false},"featured_media":648,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[28],"product_tag":[],"class_list":["post-646","product","type-product","status-publish","has-post-thumbnail","product_cat-hpl-vertical-direct-connect-pump","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/product\/646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/comments?post=646"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/media\/648"}],"wp:attachment":[{"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/media?parent=646"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/product_brand?post=646"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/product_cat?post=646"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/cg.0553.site\/de\/wp-json\/wp\/v2\/product_tag?post=646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}