Core Purpose Statement
This guide covers multiple series of manual reversal valves, including K24R8B, KA, PQ, QP, PJX, and ZY6A. These valves are specifically engineered to match hydraulic systems of industrial equipment such as metalworking machines (CNC lathes, milling machines), construction machinery (small excavators, loaders), agricultural machinery (tractors, harvesters), and light industrial hydraulic presses. Targeted at machinery manufacturers, maintenance & repair service providers, and industrial production enterprises, they address core needs for reliable hydraulic circuit reversal, precise flow control, and durable operation in medium to light-duty hydraulic environments. Compliant with ISO 4401 and GB/T 13852-2008 standards, these valves eliminate risks of hydraulic system leakage, stuck valve core (valve core), and reversal failure, ensuring stable and safe operation of equipment hydraulic circuits.
Product Classification & Detailed Specifications
1. K24R8B Series Manual Reversal Valves
Designed for medium-duty hydraulic systems requiring reliable reversal performance, K24R8B series valves resolve issues of valve core jamming and internal leakage in frequent reversal scenarios. Ideal for hydraulic circuits of small excavators, metalworking lathes, and hydraulic feeders. Their robust spool design and precision machining ensure smooth reversal operation and long service life, critical for maintaining continuous operation of medium-load hydraulic equipment. (78 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | K24R8B-L6 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve core wear caused by contaminated hydraulic oil containing metal particles; 2. Sealing ring aging and leakage due to long-term operation at high temperatures (exceeding 80℃) | 1. Install a 10μm precision oil filter in the hydraulic system; replace hydraulic oil every 2000 operating hours; 2. Monitor system temperature, ensuring it does not exceed 80℃; replace nitrile rubber seals with fluororubber seals if high-temperature operation is unavoidable |
2 | K24R8B-L8 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve body cracking due to excessive hydraulic pressure exceeding rated range; 2. Handle connection loosening caused by frequent manual operation vibration | 1. Install a pressure relief valve upstream to limit system pressure within 16MPa (rated pressure); avoid overpressure impact; 2. Check handle connection bolts monthly; retighten with torque wrench (torque: 6-8N·m) and apply thread locking adhesive |
3 | K24R8B-L10 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Internal leakage caused by wear of valve core sealing surface due to long-term frequent reversal; 2. Corrosion of valve body internal cavity by moisture in hydraulic oil | 1. Reduce unnecessary frequent reversal operations; conduct leakage testing quarterly (allowable leakage ≤5mL/min); 2. Use anti-rust hydraulic oil and keep the oil tank sealed to prevent moisture ingress; drain water from the oil tank bottom monthly |
4 | K24R8B-L15 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve core jamming caused by hydraulic oil oxidation and sludge accumulation; 2. Sealing ring damage by incompatible hydraulic oil additives | 1. Use hydraulic oil with appropriate viscosity grade (ISO VG46 recommended); avoid mixing different types of hydraulic oil; 2. Check hydraulic oil oxidation degree quarterly (acidity value ≤0.3mgKOH/g); replace oil if oxidation is severe |
5 | K24R8B-L20 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve body deformation due to improper installation and uneven stress; 2. Valve core wear caused by high flow rate exceeding rated capacity | 1. Ensure flat installation surface (flatness ≤0.02mm/m); tighten mounting bolts uniformly in diagonal order; 2. Confirm system flow rate does not exceed 40L/min (rated flow); install a flow control valve if flow is excessive |
2. KA Series Manual Reversal Valves
Optimized for light to medium-duty hydraulic systems requiring compact installation, KA series valves address issues of large installation space occupation and poor operation flexibility of conventional valves. Suitable for hydraulic circuits of agricultural machinery (tractors, harvesters) and small hydraulic presses. Their compact structure and lightweight design ensure easy installation and operation, critical for space-constrained light-load hydraulic equipment. (76 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | KA-L6 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve body corrosion caused by outdoor rain and moisture; 2. Valve core jamming due to dust ingress into the valve stem gap | 1. Apply anti-corrosion paint to the valve body surface for outdoor installation; install a protective cover; 2. Install a dust seal at the valve stem end; clean the valve stem surface weekly to remove dust |
2 | KA-L8 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Sealing ring leakage caused by vibration of agricultural machinery during operation; 2. Valve core wear due to low-quality hydraulic oil | 1. Install a vibration damping pad between the valve and the installation base; 2. Use hydraulic oil that meets API CF-4 grade standards; replace oil every 1500 operating hours for agricultural machinery |
3 | KA-L10 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Handle breakage caused by excessive manual operation force; 2. Valve body internal cavity wear due to long-term operation with air in the hydraulic system | 1. Operate the handle smoothly, avoiding excessive force (operating force ≤50N); 2. Bleed air from the hydraulic system before starting; check for air leakage in the suction line monthly |
4 | KA-L15 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve core deformation caused by cold impact in low-temperature environments (below -10℃); 2. Sealing ring hardening and cracking due to low temperature | 1. Use low-temperature resistant hydraulic oil (pour point ≤-25℃) in cold regions; 2. Replace EPDM seals with low-temperature resistant silicone rubber seals for low-temperature operation |
5 | KA-L20 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Internal leakage caused by wear of valve core guide sleeve; 2. Valve body oil port damage due to improper pipe connection | 1. Check the fit clearance between the valve core and guide sleeve semi-annually (allowable clearance 0.01-0.02mm); replace the guide sleeve if worn; 2. Use flared pipe fittings matching the oil port size; avoid over-tightening pipe nuts |
6 | KA-L25 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve body overheating caused by excessive flow rate and high pressure loss; 2. Sealing ring aging due to long-term exposure to sunlight | 1. Ensure system flow rate does not exceed 63L/min (rated flow); 2. Install a sunshade cover for outdoor installation; replace seals every 12 months for outdoor use |
7 | KA-L40 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve core wear caused by high-speed fluid scouring; 2. Valve body deformation due to uneven mounting surface | 1. Install a flow buffer at the valve inlet to reduce fluid scouring; 2. Process the mounting surface to meet flatness requirements (flatness ≤0.02mm/m); use gasket to adjust stress |
3. PQ Series Manual Reversal Valves
Engineered for precision flow control and reversal in light-duty hydraulic systems, PQ series valves resolve issues of poor flow control accuracy and unstable reversal in precision equipment. Suitable for hydraulic circuits of precision milling machines, electronic component assembly machines, and small automated hydraulic systems. Their precision-machined valve core and flow control structure ensure accurate flow regulation and smooth reversal, critical for precision hydraulic control. (77 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | PQ-L10 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core; nitrile rubber sealing ring; steel handle with plastic grip | 1. Flow control accuracy degradation caused by valve core wear; 2. Sealing ring leakage due to hydraulic oil contamination | 1. Use 5μm high-precision oil filter; calibrate flow control accuracy quarterly (allowable error ±2%); 2. Check hydraulic oil cleanliness monthly (NAS 8 grade or higher); replace oil if contaminated |
2 | PQ-L15 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core; nitrile rubber sealing ring; steel handle with plastic grip | 1. Valve core jamming caused by hydraulic oil oxidation sludge; 2. Handle rotation inflexibility due to thread wear | 1. Use anti-oxidation hydraulic oil; check oil oxidation degree quarterly; 2. Lubricate the handle thread with molybdenum disulfide grease every 3 months; avoid excessive rotation force |
3 | PQ-L10[M] | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core (hardened); nitrile rubber sealing ring; steel handle with plastic grip | 1. Hardened valve core surface peeling caused by impact load; 2. Sealing ring damage by metal particles from peeling | 1. Avoid sudden impact load in the hydraulic system; install a shock absorber upstream; 2. Check the valve core surface for peeling quarterly; replace the valve core if damage is found |
4. QP Series & Derivative Manual Reversal Valves
Tailored for general-purpose hydraulic systems requiring versatility and reliability, QP series and derivative valves resolve issues of poor compatibility and short service life in multi-scenario applications. Suitable for hydraulic circuits of small hydraulic lifts, conveyor belt hydraulic systems, and general industrial machinery. Their standardized structure and durable materials ensure wide compatibility and stable operation in various general-purpose hydraulic environments. (76 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | K23D-L10-J | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve core wear caused by long-term operation with low-viscosity hydraulic oil; 2. Sealing ring leakage due to temperature rise | 1. Use hydraulic oil with viscosity grade ISO VG32-VG68; avoid using low-viscosity oil; 2. Monitor system temperature, ensuring it does not exceed 70℃; enhance system heat dissipation if necessary |
2 | KPSA-8 | Aluminum alloy (6063) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve body corrosion caused by chemical media in the working environment; 2. Valve core jamming due to dust accumulation | 1. Apply anti-corrosion coating to the valve body for chemical environment use; 2. Install a dust-proof cover; clean the valve exterior weekly |
3 | K23JR1-L3 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; steel handle | 1. Internal leakage caused by valve core sealing surface damage; 2. Handle connection loosening due to vibration | 1. Avoid hitting the valve core during maintenance; check the sealing surface for scratches quarterly; 2. Retighten handle connection bolts monthly; use lock washers |
4 | QP215-DW | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core; nitrile rubber sealing ring; steel handle with rubber grip | 1. Valve body deformation caused by over-tightening of mounting bolts; 2. Sealing ring aging due to long-term operation | 1. Tighten mounting bolts uniformly with torque wrench (torque: 5-7N·m); 2. Replace sealing rings every 12 months regardless of wear condition |
5 | QLPY2 | Aluminum alloy (6061) valve body; 45# carbon steel valve core; EPDM rubber sealing ring; aluminum alloy handle | 1. Valve core wear caused by high flow rate; 2. Valve stem leakage due to seal damage | 1. Ensure system flow rate does not exceed rated value; install a flow control valve if needed; 2. Check the valve stem seal monthly; replace the seal if leakage is found |
6 | QP106 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; steel handle | 1. Valve core jamming caused by hydraulic oil contamination; 2. Valve body oil port thread damage due to improper pipe connection | 1. Install a precision oil filter; replace hydraulic oil regularly; 2. Use pipe fittings with matching thread specifications; avoid over-tightening |
7 | QP108 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; steel handle | 1. Internal leakage caused by valve core wear; 2. Handle breakage due to excessive force | 1. Conduct leakage testing quarterly; replace the valve core if leakage exceeds the limit; 2. Operate the handle with uniform force, avoiding sudden impact |
8 | QP210 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; steel handle | 1. Valve body overheating caused by poor heat dissipation; 2. Sealing ring hardening due to high temperature | 1. Ensure sufficient ventilation around the valve; avoid installing in closed spaces; 2. Replace nitrile rubber seals with high-temperature resistant fluororubber seals if overheating occurs |
9 | QP208 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; steel handle | 1. Valve core deformation caused by cold temperature; 2. Sealing ring cracking due to low temperature | 1. Use low-temperature resistant hydraulic oil in cold regions; 2. Replace seals with low-temperature resistant silicone rubber seals |
10 | QP320 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core; nitrile rubber sealing ring; steel handle | 1. Valve body cracking due to overpressure; 2. Valve core wear caused by high-pressure fluid scouring | 1. Install a pressure relief valve to limit system pressure; 2. Install a flow buffer at the valve inlet to reduce fluid scouring |
5. PJX Series Manual Reversal Valves
Designed for medium-flow hydraulic systems requiring stable operation, PJX series valves resolve issues of flow fluctuation and internal leakage in continuous operation scenarios. Ideal for hydraulic circuits of conveyor systems, hydraulic lifts, and medium-sized hydraulic presses. Their optimized flow channel design and reliable sealing structure ensure stable flow and long-term leak-free operation, critical for continuous industrial production. (77 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | PJX-L8 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve core wear caused by hydraulic oil contamination; 2. Sealing ring leakage due to vibration | 1. Install a 10μm oil filter; replace hydraulic oil every 2500 operating hours; 2. Install vibration damping pads; check sealing performance monthly |
2 | PJX-L110 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core; nitrile rubber sealing ring; steel handle | 1. Valve body deformation caused by uneven stress during installation; 2. Valve core jamming due to long-term continuous operation | 1. Ensure flat and smooth installation surface; tighten bolts uniformly; 2. Stop the system for 10 minutes every 4 hours of continuous operation to reduce valve core wear |
3 | PJX-L15 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Internal leakage caused by wear of valve core sealing surface; 2. Handle loosening due to frequent operation | 1. Check the sealing surface for wear quarterly; grind the surface if necessary; 2. Retighten handle bolts weekly; apply thread locking adhesive |
4 | PJX-L20 | Gray cast iron (HT200) valve body; 45# carbon steel valve core; nitrile rubber sealing ring; zinc-plated steel handle | 1. Valve body overheating caused by high flow rate and narrow flow channel; 2. Sealing ring aging due to high temperature | 1. Ensure system flow rate does not exceed rated value; 2. Monitor system temperature; replace seals with high-temperature resistant type if needed |
6. ZY6A Series Manual Reversal Valves
Optimized for precision hydraulic control systems requiring reliable reversal and low leakage, ZY6A series valves resolve issues of high leakage and poor reversal precision in precision equipment. Suitable for hydraulic circuits of precision grinding machines, electronic component processing equipment, and small precision hydraulic systems. Their precision-machined components and advanced sealing technology ensure minimal leakage and accurate reversal, critical for precision hydraulic control. (78 words)
Product No. | Product Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | ZY6A-1-106 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core (precision ground); PTFE sealing ring; steel handle with precision knob | 1. Valve core wear caused by contaminated hydraulic oil with fine particles; 2. Sealing ring damage due to incompatible hydraulic oil additives | 1. Use 3μm ultra-precision oil filter; maintain hydraulic oil cleanliness at NAS 7 grade or higher; 2. Use hydraulic oil with additives compatible with PTFE; avoid using oil with extreme pressure additives exceeding 1.5% |
2 | ZY6A-1-104 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core (precision ground); PTFE sealing ring; steel handle with precision knob | 1. Reversal precision degradation caused by valve core guide sleeve wear; 2. Handle rotation inaccuracy due to thread wear | 1. Check guide sleeve wear quarterly; replace if fit clearance exceeds 0.005mm; 2. Lubricate handle thread with high-precision lubricating grease every 2 months; calibrate reversal precision quarterly |
3 | ZY6A-2-106 | Gray cast iron (HT250) valve body; 40Cr alloy steel valve core (precision ground); PTFE sealing ring; steel handle with precision knob | 1. Internal leakage caused by PTFE seal wear; 2. Valve body corrosion caused by moisture in hydraulic oil | 1. Check leakage rate quarterly (allowable leakage ≤1mL/min); replace PTFE seals if needed; 2. Use anti-rust hydraulic oil; keep the oil tank sealed and dry |
Procurement & Technical Reference Standards
1. Procurement Reference Standards
Certification Compliance: Prioritize products certified to ISO 4401 (international standard for hydraulic valves) and GB/T 13852-2008 (Chinese national standard for manual hydraulic directional valves). Ensure material certification (e.g., 45# carbon steel meets GB/T 699, aluminum alloy meets GB/T 3190) to guarantee product quality.
Parameter Matching: Confirm the valve's nominal diameter (match the hydraulic system pipe diameter), rated pressure (≥ system working pressure + 2MPa), rated flow (≥ system working flow), and installation type (flange/thread/mounting plate) matching the equipment hydraulic circuit. Verify the valve's function (3-position 4-way, 2-position 3-way, etc.) meets system reversal requirements.
Environmental Adaptability: For high-temperature environments (＞80℃), select valves with fluororubber seals and high-temperature resistant materials. For low-temperature environments (＜-10℃), choose low-temperature resistant hydraulic oil and silicone rubber seals. For outdoor or corrosive environments, select valves with anti-corrosion coatings and dust-proof/water-proof structures (IP65 or higher).
Quality & Reliability Indicators: Verify the valve's internal leakage rate (≤5mL/min for medium-pressure valves), service life (≥100,000 reversal cycles), and pressure loss (≤0.5MPa at rated flow). Check the manufacturer's ISO 9001 quality management system certification and after-sales service capability.
2. Technical Problem-Solving Reference Standards
Valve Core Jamming: Check for hydraulic oil contamination, valve core wear, or foreign object ingress. Replace contaminated hydraulic oil, clean the valve body internal cavity, and inspect the valve core for wear. If the valve core is severely worn, replace it with a new one. Install a high-precision oil filter to prevent recurrence.
Internal/External Leakage: For internal leakage, check the valve core sealing surface and sealing ring for wear or damage; grind the sealing surface or replace the sealing ring. For external leakage, inspect the valve stem seal, oil port connection, and mounting surface; replace the seal, re-tighten the connection, or adjust the mounting surface flatness. Conduct a pressure test after repair to confirm no leakage.
Unsmooth Reversal Operation: Check for handle jamming, valve core deformation, or insufficient lubrication. Clean the handle mechanism and lubricate the moving parts. Inspect the valve core for deformation; replace if necessary. Check the hydraulic system pressure; ensure it is within the valve's rated pressure range.
Flow/Pressure Control Inaccuracy: Calibrate the valve's flow/pressure control mechanism; adjust the handle or regulating knob to the correct position. Check the valve core and flow control components for wear; replace worn parts. Verify the hydraulic oil viscosity and cleanliness; replace oil if it does not meet requirements.
Procurement Invitation
Our comprehensive range of manual reversal valves, including K24R8B, KA, PQ, QP, PJX, and ZY6A series, are engineered to deliver reliable, precise, and durable performance in various industrial hydraulic systems. Whether you need valves for construction machinery, agricultural equipment, precision metalworking machines, or general industrial hydraulic circuits, we have the right solution to meet your specific pressure, flow, and environmental requirements. Contact our professional sales team today to obtain detailed product data sheets, technical specifications, and competitive pricing. Our technical experts will provide personalized selection and installation recommendations based on your hydraulic system parameters and operating conditions, supporting your equipment's stable and efficient operation.
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