Jadesun Logo
02-2331-1097

Monday to Friday 8:30am~5:30pm

join us contact us

Product Inquiry List

After sending your product inquiry list, our relevant business unit will contact you as soon as possible

Send a product enquiry list

PRODUCT INFORMATION

Danfoss BFP 21 LE-S Size 3 Preheating Anti-Drip Oil Pump | Includes Safety Shutdown 24 l/h

Product Information

For diesel combustion equipment used in oil-containing preheaters, to suppress oil dripping due to preheating and residual heat expansion. Danfoss BFP 21 LE-S Size 3 Preheating Anti-Drip Oil Pump | Includes Safety Shutdown 24 l/h

The solenoid valve has a built-in check valve (LE-S) to prevent oil dripping from the nozzle in conjunction with the oil preheater. The preheater valve opens when the pressure is ≥6 bar, and the check valve opens when the pressure is ≤2 bar.

配置油預熱器的燃燒器，預熱與停機殘熱會使噴嘴滴油

使用油預熱器的柴油燃燒器，啟動前油在預熱器與噴嘴管路中受熱膨脹，停機後殘熱亦然；若無洩放路徑，容易在噴嘴滴油、積碳。Danfoss BFP 21 LE-S 以電磁閥內建回止閥處理此膨脹。

 

LE-S 預熱防滴的運作機制

啟動前油在預熱器與噴嘴管路中加熱膨脹，預熱器內的安全切斷閥防止油自噴嘴滴出，因電磁閥內回止閥 B 開啟、接通泵的回油或吸入側以釋放膨脹壓力。預熱器閥於壓力 ≥ 6 bar 開啟；電磁閥回止閥 B 於 ≤ 2 bar 開啟。可切換單／雙管操作。

 

BFP 21 LE-S Design features

在 BFP 21 基礎上，電磁閥整合回止閥（LE-S），需與油預熱器搭配；亦可與 LE 噴嘴或含 LE 閥之預熱器（FPHB-LE）配合達成相同防滴效果。線圈 9 W／230 V、IP 40，卡匣式濾網 11 cm²／200 µm，軸頸 EN 225。

 

與一般 BFP 21 的差異

BFP 21 為一般電磁閥切斷；LE-S 版另在電磁閥整合回止閥，專為預熱式系統防滴。若燃燒器配置油預熱器，宜選 LE-S；無預熱器則一般 BFP 21 即可。

 

Application scenarios and system pairings

BFP 21 LE-S 適用配置油預熱器的小型柴油燃燒器供油，須與預熱器（及視需要 LE 噴嘴）搭配。

 

電磁閥內建回止閥（LE-S），配合油預熱器防止噴嘴滴油，預熱器閥 ≥6 bar 開啟、回止閥 ≤2 bar技術講解

project content
Type 單段家用燃燒器油泵，電磁閥內建回止閥（LE-S），搭配油預熱器防滴
capacity Size 3：約 24 l/h（@4.3 cSt, 10 bar, 2800 min⁻¹）
適用燃料 輕油及其生質摻配；DIN EN 51603-1、DIN EN 51603-6／-8 及 EN 14214
防滴機制 預熱／停機時油受熱膨脹，電磁閥內回止閥 B 開啟、接通回油或吸入側，避免噴嘴滴油
預熱器安全閥開啟壓力 ≥ 6 bar
電磁閥回止閥（B）開啟壓力 ≤ 2 bar
搭配 油預熱器；可與 LE 噴嘴或含 LE 閥之預熱器（FPHB-LE）配合
管路系統 單管或雙管（可切換）
壓力範圍 7–20 bar
出廠設定壓力 10 ±1 bar
運作黏度 1.8–12 cSt
進油／回油耐壓 ≤ 2 bar
濾網 卡匣式，11 cm²／200 µm
轉速 2400–3450 min⁻¹
油溫 0–70°C
線圈耗電 9 W；額定 230 V；防護 IP 40
安裝 法蘭；軸頸依 EN 225
進／回油口 G 1/4；噴嘴出口 G 1/8；壓力／真空錶孔 G 1/8
各型號流量對照 [Pending confirmation from the original manufacturer's specifications]

Related Products

heavy oil filter

Taiwan ATS high quality

Diesel Filters | For Burners and Diesel Systems: Filtering Impurities and Moisture

Taiwan ATS high quality

Diesel filter (recommended)

Taiwan ATS high quality

日本 NOP Oil Pump/Oil Pump VS Series (2~2.5 GPH)

日本 NIPCON Original

日本 NOP Trochoid Series Oil Pump

日本 NOP Original

日本 NOP Oil Pump/Oil Pump GPL Series (150~300 L/Hr)

日本 NOP Original

日本 NOP Oil Pump/Oil Pump GFY Series (25~100 L/Hr)

日本 NOP Original

日本 NOP Oil Pump/Oil Pump GFS Series (20~35 L/Hr)

日本 NOP Original

日本 NOP Oil Pump GFH Series

日本 NOP Original

日本 NOP Oil Pump/Oil Pump GD(VK) Series (60~760 L/Hr)

日本 NOP Original

日本 NOP Oil Pump 3V Series (59~117 L/Hr)

日本 NOP Original

日本 NOP Oil Pump/Oil Pump 3RD Series (13~47 L/Hr)

日本 NOP Original

日本 NOP Oil Pump/Oil Pump 2RA Series (6~21 L/Hr)

日本 NOP Original

日本 NOP Oil Pump/Oil Pump 2HB Series (4.2~36 L/Hr)

日本 NOP Original

Weishaupt Nozzle Check Valve

美國 Monarch Original

Weishaupt nozzle

德國 Weishaupt Original

Used with T-series oil pumps, the oil supply pressure is adjusted externally by connecting to the nozzle pipeline, suitable for industrial heavy oil and light oil heating systems.

Suntec TV Series Heavy Oil Pressure Regulator Valve | Matching T Series Oil Pump Pressure Regulator

Available in two pressure ranges: 2–10 bar and 7–40 bar, allowing for installation in any orientation.

Suitable for heating and supplying residual fuel oil, heavy oil, and medium oil in marine and industrial applications. The pump body has a pre-installed mounting hole for an electric heater. Both single-pipe and double-pipe systems are available.

Suntec TAR Series Marine Oil Pumps 500~1350 L/Hr | Marine Residual Fuel Pressure Regulating Pumps

The wear-resistant design extends pump life under highly abrasive fuel conditions, with a maximum nozzle pressure of 40 bar.

Suitable for industrial heating of large-capacity burners and boilers using light and heavy oil; pump body has pre-installed mounting holes for electric heaters; both single-pipe and double-pipe systems are available.

Suntec TA Series Oil Pumps 500~1350 L/Hr | Industrial Heavy Oil Preheating High Temperature Pumps

Built-in pressure regulator and preheater mounting hole, oil temperature resistant up to 150°C, dual-use for light and heavy oil, compatible with B100, Ø 12 mm enlarged shaft.

Suitable for high-capacity supply of heavy and light oil in industrial heating, boilers, and heat transfer systems. The pump body has a pre-installed mounting hole for an electric heater. It is recommended to use an external TV valve for pressure regulation.

Suntec T Series Oil Pumps 1380~3900 L/Hr | High-Capacity Preheating Pumps for Heavy Oil

法國 original parts, heavy oil inlet pressure resistance up to 5 bar, nozzle pressure up to 40 bar, suitable for industrial applications with high viscosity fuels.

Used for oil supply to medium and large industrial burners and boilers, with a flow rate higher than that of AJ medium-capacity pumps.

Suntec J Series Oil Pumps 170~330 L/Hr | Medium Capacity Industrial Pressure Regulating Pumps

Original 法國, with built-in pressure regulating valve, available with or without shut-off function, flange mounting with Ø 11 mm shaft, oil temperature resistant up to 90°C, compatible with B100 and HVO.

Suitable for medium-capacity industrial burners and boilers supplying heavy and light/medium oil; the pump body has a pre-installed mounting hole for an electric heater; both single-pipe and double-pipe systems are compatible.

Suntec E Series Oil Pumps 170~360 L/Hr | Medium Capacity Heavy Oil Preheating Pumps

Equipped with high-temperature shaft seal and preheater mounting cavity, oil temperature resistant up to 130°C, compatible with heavy oil and B100, mechanical interface conforms to EN 225.

Small-capacity heavy oil or high-temperature diesel burner fuel supply modules are suitable for on-site configuration of preheating oil circuits.

Suntec D Series Oil Pumps 46~94 L/Hr | Medium and Heavy Oil High Temperature Oil Pumps

法國 original filter with enlarged mesh (12 cm² opening, 530 µm pore size) for thicker fuels.

Suitable for diesel and light oil burners requiring two-stage firing and rapid shut-off; both single-pipe and dual-pipe systems are applicable.

Suntec AT Series Oil Pumps 46~130 L/Hr | Two-Stage Pressure Shutdown Oil Pumps

Original 法國, two sets of cone valves with independent high and low pressure settings, and the shut-off solenoid valve is normally closed and independent of speed.

For front-end fuel supply of small diesel combustion equipment requiring precise ignition and extinguishing.

Suntec AS series oil pumps 40~80 L/Hr | Quick-start/shut-off type pumps

Built-in normally open solenoid valve controls the pressure regulating and shut-off valve; on/off switching is independent of speed; compatible with B100 (up to 100% FAME) and HVO; TÜV certified.

Suitable for diesel and light oil burners requiring high and low fire output, both single-pipe and dual-pipe systems are applicable, but an external shut-off solenoid valve is required.

Suntec AP series oil pumps 40~130 L/Hr | Two-stage pressure oil pumps

法國 original, built-in solenoid valve provides high/low pressure adjustment, compatible with B100 and kerosene, mechanical interface conforms to EN 225.

Suitable for supplying oil to commercial and industrial light oil and diesel burners, boilers, and hot blast stoves. Both single-pipe and double-pipe systems are available, and it is often used in conjunction with pipeline solenoid valves.

Suntec AN series oil pumps 40~130 L/Hr | Basic pressure regulating shut-off pump

The 法國 is a factory-manufactured product with a basic structure where the pressure regulating valve itself completes the shut-off without the need for an external solenoid valve. It has passed factory pressure setting calibration.

Suitable for diesel and light oil burners with shut-off nozzles, where suppression of residual heat expansion in preheaters or boilers is required; both single-pipe and dual-pipe systems are applicable.

Suntec ALE series oil pumps 40~130 L/Hr | Solenoid valve shut-off pump with nozzle pressure relief

Original 法國 solenoid valve with built-in reflux valve, serving as both pipeline shut-off and nozzle pressure relief. Performance and dimensions identical to AL, compatible with B100 (up to 100% FAME) and HVO, TÜV certified.

Medium to large-sized light oil burner oil supply modules are suitable for on-site configurations requiring smooth start-up and shutdown, unaffected by engine speed.

Suntec AL series oil pumps 40~130 L/Hr | Normally closed solenoid valve shut-off pumps

The 法國 is an original manufacturer product, featuring a normally closed solenoid valve designed for rapid response, and conforms to DIN SPEC 51603-6/EN 14214 biofuel compatibility specifications.

Used for front-end oil supply to medium-capacity diesel burners and medium-sized boilers, and can be equipped with pipeline solenoid valves for shut-off.

Suntec AJ Series Oil Pumps 170~260 L/Hr | Medium Capacity Basic Shut-off Pumps

法國 original, nozzle pressure up to 30 bar, large area filter (30 cm²), durable design.

Used to cut off the fuel supply to the front end of a diesel combustion device that is independently controlled by a pipeline solenoid valve.

Suntec AE Series Oil Pumps 40~130 L/Hr | Basic Type Non-Stop Pressure Regulating Pump

Original 法國, simplified structure, no cutting parts, simple maintenance.

For diesel burners with dual-nozzle segmented ignition, two sets of solenoid valves independently open and close each nozzle.

Suntec A2L series oil pumps 40~130 L/Hr | Dual-nozzle dual-solenoid valve oil pumps

法國 original, dual solenoid valves with independent shut-off and switching independent of speed, IP 54 protection.

Steinen Nozzle Check Valve

美國 Monarch Original

Steinen nozzle

美國 Steinen Original

Monarch Nozzle Check Valve

美國 Monarch Original

Monarch nozzle

美國 Monarch Original

Hago Nozzle Check Valve

美國 Hago Original

Hago nozzle

美國 Hago Original

Delavan Nozzle Check Valve

美國 Delavan Original

Delavan nozzle

美國 Delavan Original

Suitable for both residential and commercial high-pressure oil burners. The spray pattern and angle can be selected based on the combustion chamber shape. Use with a Danfoss BFP oil pump.

Danfoss Oil Nozzle | High-Pressure Oil Burner Nozzle B/S/H Spray Type, Multi-Spray Angle

Built-in sintered copper filter (large capacity uses monel mesh) to prevent clogging.

Directly locks onto the nozzle, suppresses nozzle dripping after shutdown, suitable for high-pressure burners of diesel and heavy oil.

Danfoss Nozzle Check Valve | Ceramic Bead Nozzle Anti-Drip Check Valve (Diesel/Heavy Oil)

The ceramic ball-type check valve is compact and can be directly locked to the nozzle, making installation and operation simple. It is suitable for both diesel and heavy oil.

Suitable for supplying fuel to medium-sized household diesel burners and boilers; the pump has a built-in solenoid valve for shut-off; both single-pipe and dual-pipe systems are compatible.

Danfoss BFP 21 Size 5 Solenoid Valve Shut-off Oil Pump | Medium-sized Domestic Burner 42 l/h

Original 丹麥, with a built-in solenoid valve for immediate shut-off upon shutdown. Size 5, larger capacity, compatible with up to 100% biodiesel (Bio100 version).

Suitable for supplying fuel to small household diesel burners and boilers; the pump has a built-in solenoid valve for shut-off; both single-pipe and dual-pipe systems are compatible.

Danfoss BFP 21 Size 3 Solenoid Valve Shut-off Oil Pump | 24 L/h Household Burner

丹麥 original factory, solenoid valve life up to 250,000 cycles or 10 years, journal conforms to EN 225

Suitable for supplying fuel to medium-sized domestic diesel burners and boilers; shut-off is controlled by an external solenoid valve; both single-pipe and dual-pipe systems are compatible.

Danfoss BFP 20 Size 5 Electromagnetic Valve-less Oil Pump | Medium-sized Domestic Burner 42 L/h

Original 丹麥, Size 5, larger capacity, basic structure without solenoid valve, easy to maintain.

Suitable for supplying fuel to small household diesel burners and boilers; shut-off is controlled by an external solenoid valve; both single-pipe and dual-pipe systems are compatible.

Danfoss BFP 20 Size 3 Solenoidless Oil Pump | Basic 24 L/h Household Burner

Original 丹麥, single-stage design, cartridge filter, compatible with up to 100% biodiesel (Bio100 version), journal conforms to EN 225.