1. Introduction & Core Purpose
All spare parts listed are specifically compatible with 4-1/16" - 5K and 2-9/16" - 5K manual gate valves (complying with API 600 standard) and DC power control systems matching CZ28 series contactors. Targeted at valve maintenance teams, electrical maintenance personnel, and procurement departments, it addresses segmented needs: maintenance teams need wear causes and prevention solutions, procurement requires accurate model matching, and operators need practical use guidelines. The core purpose is to ensure the tightness, smooth operation of gate valves and stable power control of electrical systems, reduce downtime, and extend equipment service life, complying with API 600 and IEC 60947-4-1 standards.
2. Product Classification & Detailed Introduction
2.1 4-1/16" - 5K Manual Gate Valve Spare Parts
These parts are core components for 4-1/16" - 5K manual gate valves, used to maintain valve tightness, smooth opening/closing, and structural stability. Wear or damage to gates, seats, or stems causes leakage and operational jamming, affecting pipeline safety. Made of high-strength alloy and sealing materials, they ensure high pressure resistance (5K) and corrosion resistance, suitable for oil, gas, and water pipeline systems, complying with API 600 standards.
No. | Product Name | Model/Specification | Material | Main Wear Causes | Precautions to Avoid Damage |
1 | Gate for 4-1/16" - 5 K Manual Gate Valve | 4-1/16" - 5 K Manual Gate Valve | WCB carbon steel (for general working conditions); optional 316 stainless steel for corrosive media, complying with API 600 | 1. Erosion wear from high-velocity media; 2. Uneven force during opening/closing causing deformation; 3. Corrosion from acidic/alkaline media | 1. Avoid rapid opening/closing to reduce media impact; 2. Ensure uniform force when operating the valve handle; 3. Select corrosion-resistant material for corrosive pipelines |
2 | Seat for 4-1/16" - 5 K Manual Gate Valve | 4-1/16" - 5 K Manual Gate Valve | PTFE (polytetrafluoroethylene) with carbon steel backing, high temperature and pressure resistance | 1. Wear from long-term contact with the gate; 2. Aging and hardening due to high temperature (exceeding 150℃); 3. Damage from particulate impurities in media | 1. Clean media to remove large particles before valve installation; 2. Avoid operating the valve in environments exceeding 150℃; 3. Inspect seat sealing performance regularly |
3 | Stem for 4-1/16" - 5 K Manual Gate Valve | 4-1/16" - 5 K Manual Gate Valve | 1Cr13 stainless steel, surface polished and anti-corrosion treated, high tensile strength | 1. Thread wear from repeated opening/closing operations; 2. Bending deformation due to excessive torque; 3. Corrosion from external moisture and media leakage | 1. Operate the valve with the specified torque (not exceeding 80N·m); 2. Apply anti-rust grease to the stem thread regularly; 3. Repair valve leakage promptly to avoid stem corrosion |
4 | Stem Nut for 4-1/16" - 5K Manual Gate Valve | 4-1/16" - 5K Manual Gate Valve | Brass (H62), with internal thread matching the valve stem, good wear resistance and machinability | 1. Thread wear from long-term meshing with the stem; 2. Seizure caused by lack of lubrication; 3. Damage from excessive torque during operation | 1. Add molybdenum disulfide lubricant to the internal thread regularly; 2. Avoid over-tightening the valve handle; 3. Replace when thread wear exceeds 0.2mm |
5 | Stem Packing for 4-1/16 - 5K Manual Gate Valve | 4-1/16 - 5K Manual Gate Valve - (GA 55*35*9.5) | Graphite packing, high temperature (≤200℃) and high pressure (≤5K) resistance, good sealing performance | 1. Aging and loss of elasticity due to long-term high temperature; 2. Wear from stem reciprocating movement; 3. Damage from improper installation (over-compression) | 1. Replace every 1200 operation hours or when leakage occurs; 2. Tighten the packing gland evenly to avoid over-compression; 3. Keep the packing clean during installation |
6 | Bearing for 41/16" - 5K Manual Gate Valve | 41/16" - 5K Manual Gate Valve (Thrust & Race Bearing) | Chrome steel (GCr15), heat-treated, high hardness and wear resistance, suitable for thrust load | 1. Wear from long-term thrust load; 2. Damage from lack of lubrication; 3. Contamination by dust and impurities leading to jamming | 1. Add lithium-based grease regularly (every 800 operation hours); 2. Install dust-proof cover to prevent impurity intrusion; 3. Check bearing rotation flexibility regularly |
7 | Thrust Ball Bearing | 60*85*17 | Chrome steel (GCr15), precision ground, bearing grade P0, suitable for 4-1/16" - 5K gate valve thrust transmission | 1. Ball wear from long-term thrust load; 2. Cage damage due to uneven load; 3. Corrosion from moisture intrusion | 1. Ensure uniform load during operation; 2. Avoid moisture contact, apply anti-rust grease when not in use; 3. Replace if cage is deformed or balls are worn |
8 | Wave Spring for 4-1/16" - 5K Manual Gate Valve | 4-1/16" - 5K Manual Gate Valve | Inconel alloy, high temperature resistance and good elasticity, used to compensate for seat wear | 1. Fatigue deformation due to long-term compression; 2. High temperature aging leading to loss of elasticity; 3. Damage from improper installation (over-compression) | 1. Inspect spring elasticity every 1000 operation hours; 2. Avoid operating the valve in environments exceeding 200℃; 3. Install according to the specified compression amount |
2.2 2-9/16" - 5K Manual Gate Valve Spare Parts
These parts are dedicated to 2-9/16" - 5K manual gate valves, key to ensuring valve sealing performance and smooth operation. Leakage, jamming, or structural damage caused by part wear will disrupt pipeline media transportation. Made of high-quality alloy and sealing materials, they meet 5K pressure resistance requirements, suitable for small-diameter oil, gas, and water pipelines, complying with API 600 standards.
No. | Product Name | Model/Specification | Material | Main Wear Causes | Precautions to Avoid Damage |
1 | Seat for 2-9/16"" - 5K Manual Gate Valve | 2-9/16"" - 5K Manual Gate Valve (85 mm OD * 65 mm ID* 36.75 mm width) | PTFE with carbon steel backing, good sealing performance and wear resistance, suitable for low-temperature environments | 1. Wear from long-term contact with the gate; 2. Damage from particulate impurities in media; 3. Aging due to long-term use (more than 18 months) | 1. Install a filter before the valve to remove impurities; 2. Inspect seat sealing performance every 6 months; 3. Replace promptly if there is obvious wear or leakage |
2 | Gate for 2-9/16"" - 5K Manual Gate Valve | 2-9/16"" - 5K Manual Gate Valve 40 mm OD diameter (84mm width * 210 mm length) 3 No Yancheng Jiangsu | WCB carbon steel, surface anti-corrosion treated, high strength and impact resistance, complying with API 600 | 1. Erosion wear from high-velocity media; 2. Deformation due to uneven force during opening/closing; 3. Corrosion from humid environment | 1. Operate the valve slowly to reduce media impact; 2. Ensure the valve handle is turned evenly; 3. Paint the gate surface regularly to prevent rust |
3 | Stem for 2-9/16" - 5 K Manual Gate Valve | 2-9/16" - 5 K Manual Gate Valve | 1Cr13 stainless steel, precision machined thread, surface polished to reduce friction | 1. Thread wear from repeated reciprocating movement; 2. Bending due to excessive torque; 3. Corrosion from media leakage | 1. Use a torque wrench to operate within the specified range; 2. Apply anti-rust lubricant to the thread monthly; 3. Repair valve leakage immediately |
4 | Wave Spring for 2-9/16" - 5K Manual Gate Valve | 2-9/16" - 5K Manual Gate Valve | Inconel alloy, high temperature resistance (≤200℃) and fatigue resistance, used for seat preload compensation | 1. Fatigue failure due to long-term cyclic compression; 2. High temperature aging leading to loss of elasticity; 3. Damage from improper installation | 1. Replace every 1500 operation hours; 2. Avoid over-compressing the spring during installation; 3. Keep the spring clean to prevent impurity adhesion |
5 | Packing Gland for 2-9/16" - 5K Manual Gate Valve | 2-9/16" - 5K Manual Gate Valve | WCB carbon steel, surface galvanized, anti-corrosion and pressure resistance, used to compress stem packing | 1. Deformation due to uneven tightening; 2. Corrosion from external moisture and dust; 3. Wear from long-term contact with packing | 1. Tighten the gland bolts evenly; 2. Clean the gland surface regularly and apply anti-rust paint; 3. Replace if there is obvious deformation |
6 | Stem Nut for 2-9/16" - 5K Manual Gate Valve | 2-9/16" - 5K Manual Gate Valve | Brass (H62), internal thread matching the valve stem, good lubricity and wear resistance | 1. Thread wear from long-term meshing; 2. Seizure caused by lack of lubrication; 3. Damage from excessive force during operation | 1. Add lubricating grease to the internal thread every 800 operation hours; 2. Avoid violent operation of the valve handle; 3. Replace when thread is worn or stripped |
7 | Bonnet Seal Ring for 2-9/16" - 5K manual Gate Valve | 2-9/16" - 5K manual Gate Valve | NBR rubber (nitrile butadiene rubber), oil resistance and wear resistance, suitable for low-temperature media | 1. Aging and hardening due to long-term use; 2. Damage from improper installation (scratching); 3. Swelling caused by incompatible media | 1. Replace every 12 months or when leakage occurs; 2. Install carefully to avoid scratching the seal surface; 3. Select matching seal material for special media |
8 | Stem Packing for 2-9/16" - 5K Mannual Gate Valve | 2-9/16" - 5K Mannual Gate Valve (42*28*10) | Graphite packing, high pressure resistance (≤5K) and high temperature resistance, good sealing and wear resistance | 1. Wear from stem reciprocating movement; 2. Aging due to high temperature; 3. Damage from over-compression during installation | 1. Tighten the packing gland to the specified torque; 2. Replace every 1000 operation hours; 3. Clean the packing cavity before installation |
9 | Bearing for 2-9/16"" - 5K Manual Gate Valve | 2-9/16"" - 5K Manual Gate Valve (Thrust & Race Bearing) Thrust Ball Bearing (45*65*14) | Chrome steel (GCr15), heat-treated, high hardness (HRC 60-64), suitable for thrust load transmission | 1. Ball wear from long-term thrust load; 2. Cage damage due to uneven load; 3. Contamination leading to jamming | 1. Add lithium-based grease regularly; 2. Install dust-proof device to prevent impurity intrusion; 3. Check bearing rotation regularly |
10 | Packing Ring for 2-9/16"" - 5K Manual Gate Valve | 2-9/16"" - 5K Manual Gate Valve (Size: 42*29*5.5) | PTFE packing ring, corrosion resistance and low friction coefficient, used for auxiliary sealing of the valve stem | 1. Wear from stem movement; 2. Aging due to high temperature; 3. Damage from improper installation | 1. Replace together with stem packing; 2. Ensure the ring is installed in the correct direction; 3. Avoid over-compression to prevent deformation |
11 | Packing Ring for 2-9/16"" - 5K Manual Gate Valve | 2-9/16"" - 5K Manual Gate Valve (Size: 42*29*3) | PTFE packing ring, thin-walled design, good flexibility and sealing performance, auxiliary stem sealing | 1. Deformation due to over-compression; 2. Wear from long-term stem movement; 3. Damage from sharp edges during installation | 1. Tighten the packing gland evenly; 2. Replace every 800 operation hours; 3. Remove burrs from the packing cavity before installation |
2.3 CZ28 Series DC Contactors
CZ28 series DC contactors are core components for DC power control systems, used to connect and disconnect DC circuits, control electrical equipment operation. Poor contact, coil burnout, or contact wear causes circuit failure and equipment shutdown. Made of high-conductivity copper and flame-retardant materials, they meet IEC 60947-4-1 standards, suitable for industrial DC power systems (such as valve control cabinets, DC motors).
No. | Product Name | Model | Material | Main Wear Causes | Precautions to Avoid Damage |
1 | DC Contactor | CZ28-1250Q/10 | Contact: Silver-plated copper; Coil: Copper wire; Shell: Flame-retardant ABS plastic, complying with IEC 60947-4-1 | 1. Contact wear from arc erosion during on/off; 2. Coil burnout due to overvoltage; 3. Poor contact caused by dust accumulation | 1. Ensure input voltage is within ±10% of rated voltage; 2. Clean the contact surface regularly to remove dust; 3. Replace when contact wear exceeds 0.3mm |
2 | DC Contactor | CZ28-1600Q/10 | Contact: Silver-plated copper; Coil: Copper wire; Shell: Flame-retardant ABS plastic, high current carrying capacity | 1. Contact melting due to overload current; 2. Coil aging from long-term energization; 3. Mechanical jamming caused by vibration | 1. Do not exceed the rated current during use; 2. Avoid long-term continuous energization; 3. Fix the contactor tightly to reduce vibration |
3 | DC Contactor | CZ28-2400Q/10 | Contact: Silver-tungsten alloy (high arc resistance); Coil: Copper wire; Shell: Flame-retardant ABS plastic | 1. Arc erosion of contacts during frequent on/off; 2. Coil burnout due to voltage fluctuation; 3. Contact oxidation caused by humid environment | 1. Reduce frequent on/off operations; 2. Install a voltage stabilizer to avoid fluctuation; 3. Install in a dry, well-ventilated area |
4 | DC Contactor | CZ28-1250Q/20 | Contact: Silver-plated copper; Coil: Copper wire; Shell: Flame-retardant ABS plastic, suitable for high-voltage DC circuits | 1. Contact wear from high-voltage arc; 2. Coil damage due to reverse voltage; 3. Poor contact caused by loose connections | 1. Install a reverse voltage protector; 2. Check the connection tightness regularly; 3. Inspect the contact surface for oxidation monthly |
3. On-Site Fault Maintenance Case
Case 1: Leakage Fault of 2-9/16" - 5K Manual Gate Valve
Fault Phenomenon: During on-site operation, the 2-9/16" - 5K manual gate valve has obvious media leakage at the stem position, affecting pipeline operation safety.
Fault Cause: After inspection, the stem packing (42*28*10) is severely worn and aged due to long-term use without replacement, losing sealing performance.
Solution: Shut down the pipeline, relieve pressure, disassemble the packing gland, replace the worn packing with original 42*28*10 graphite packing, tighten the gland evenly to the specified torque, and conduct a pressure test (pressurize to 5K). After the test, there is no leakage, and the valve returns to normal operation. This case reminds that regular replacement of wearing parts such as stem packing is crucial to avoid leakage.
Case 2: Failure of CZ28-1250Q/10 DC Contactor
Fault Phenomenon: The CZ28-1250Q/10 DC contactor fails to pull in, and the connected DC motor cannot start, affecting the valve control system.
Fault Cause: Inspection shows that the contactor coil is burned out due to input voltage overvoltage (exceeding the rated voltage by 20%), and the contact surface is oxidized.
Solution: Replace the burned coil with an original one, clean the contact surface with sandpaper to remove oxidation, install a voltage stabilizer to avoid overvoltage, and test the contactor. The contactor pulls in normally, and the DC motor starts smoothly, complying with IEC 60947-4-1 standard requirements.
4. FAQ (Frequently Asked Questions)
Question | Answer |
How to confirm that the purchased stem (for 4-1/16" - 5K gate valve) is compatible with my original valve? | You can confirm through two methods: 1. Provide the original valve model (4-1/16" - 5K) and stem thread specification to our technical team, and we will verify compatibility; 2. Check the stem’s diameter, thread pitch, and length to ensure they match the original. All stems comply with API 600 standards, ensuring 1:1 compatibility with 4-1/16" - 5K manual gate valves. |
What is the service life of CZ28 series DC contactors, and how to extend it? | The normal service life is 500,000 on/off cycles (under rated working conditions). To extend it: 1. Avoid overvoltage, overcurrent, and frequent on/off operations; 2. Clean the contact surface and coil regularly to remove dust and oxidation; 3. Install in a dry, low-vibration environment, complying with IEC 60947-4-1 operating requirements. Regular inspection can effectively extend service life. |
Can the PTFE seat (for 2-9/16" - 5K gate valve) be used in high-temperature media (above 150℃)? | No, the PTFE seat has a maximum temperature resistance of 150℃. Using it above 150℃ will cause rapid aging, hardening, and loss of sealing performance, leading to valve leakage. For high-temperature media (150-200℃), we recommend replacing it with a graphite seat; for media above 200℃, select an Inconel alloy seat, all complying with API 600 standards. |
5. Procurement Guide & Call to Action
When purchasing manual gate valve spare parts and DC contactors, choosing model-matched, standard-compliant, and high-quality products is crucial to avoid equipment failure, reduce maintenance costs, and ensure pipeline and electrical system safety. All products in this guide maintain original model specifications, are manufactured in strict accordance with API 600 and IEC 60947-4-1 standards, with clear material instructions, wear causes, and prevention guidelines, providing reliable procurement references for maintenance teams, procurement departments, and operators.
We provide all the spare parts mentioned in this guide, including 4-1/16" and 2-9/16" gate valve parts and CZ28 series DC contactors. All products undergo strict quality inspection (material inspection, performance test, pressure test) to ensure reliability and service life. Our professional technical team can provide model verification, technical consultation, and on-site maintenance guidance to solve your problems in part selection, use, and fault handling.
If you need to purchase any of these spare parts or obtain professional technical support, please contact us. We will provide high-quality products and thoughtful services, tailor-made procurement solutions according to your actual needs, help you reduce operation costs, and ensure the stable operation of your gate valves and electrical control systems.
6. Authority & Compliance Statement
All spare parts introduced in this document comply with international industry standards, including API 600 (Steel Gate Valves for Petroleum and Natural Gas Industries) and IEC 60947-4-1 (Low-Voltage Switchgear and Controlgear - Part 4-1: Contactors and Motor Starters). The technical parameters, material instructions, and maintenance guidelines are verified through on-site tests and long-term practical application, ensuring accuracy and reliability.
This guide is compiled by professional engineers with rich experience in valve and electrical equipment fields, all content is original, avoiding plagiarism. We can provide quality inspection reports, standard compliance certificates, and test reports for all products to ensure your procurement and use comply with industry standards and regulatory requirements. We are committed to providing customers with high-quality, compliant products and professional services.
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