Sealing Ring 51300-320-B, Spring 4P100235 and Full Compatible Series

Introduction

In the oilfield drilling, production and maintenance industry, every spare part is a key link to ensure the stable operation of equipment. A single incompatible, worn or low-quality part—whether a sealing ring, hydraulic valve, bearing, or spring—can lead to equipment shutdown, oil and gas leakage, or even safety accidents, bringing huge economic losses to on-site operations. We focus on providing a full range of high-quality, precisely matched oilfield spare parts, including core models such as Sealing Ring 51300-320-B (for NOV TDS-10SH topdrive), Spring 4P100235 (for SPM QWS-2500SD and TWS-2000 pumps), VLV, HYD, DIR, 3POS, 4WAY, 24V, D03 H10059, and FOUR POINT CONTRACT BALL BEARING QJ218 4301000480. These parts are tailor-made for specific equipment, solving the common pain points of poor compatibility, short service life, frequent failures, and difficult maintenance that trouble oilfield operators.

Our core purpose is to provide targeted spare part solutions for oilfield drilling teams, equipment maintenance companies, oil production enterprises, and offshore platform operators. We cover key equipment models such as NOV TDS-10SH topdrive, SPM QWS-2500SD and TWS-2000 pumps, Weatherford KГ TT 5.5-15, hydraulic disc brake PS series, and FLC series vibrating screens. Each part is produced and tested in strict accordance with API 610, GB/T 19832-2017, and JB/ZQ4224-97 standards, ensuring that it can withstand the harsh working environment of oilfields, help users reduce equipment downtime, lower maintenance costs, and improve overall operation efficiency and safety.

Product Overview

Core Product Models & Equipment Compatibility

We provide a complete range of spare parts covering seals, valves, bearings, shafts, fasteners, hoses, and more, all of which are precisely compatible with mainstream oilfield equipment. Key compatible equipment and matching parts are as follows:

• NOV TDS-10SH topdrive: Sealing ring 51300-320-B, 56557-8-8-S Elbow 45° O-Ring Bos 3T (for TDS Hydraulic Jack)

• SPM QWS-2500SD and TWS-2000 pumps: Spring 4P100235 (for pressure relief valve, ID: 44.72 mm, OD: 54.82 mm)

• Weatherford KГ TT 5.5-15: BTУЛKA 0489675 (541-0044, material: steel)

• Hydraulic disc brake PS series: Bushing BKD-3-6C3, Regulating rod BKD-11-7A

• General oilfield hydraulic systems: VLV, HYD, DIR, 3POS, 4WAY, 24V, D03 H10059, 140 Mpa EXTRA HIGH PRESSURE STOP 12 VALVE 140GF6-00

• Oilfield transmission equipment: FOUR POINT CONTRACT BALL BEARING QJ218 4301000480, Inboard bearing H20615-1S, input shaft assembly ZP001.21.00

• Drilling tools and accessories: Jaw 5 1/2 (177.8mm) complete with dies P1700795AA, Roller Jaw model ZQ203-100, brake drum Z03010300005AA

Function Description

Each spare part is designed to solve specific on-site pain points, ensuring stable equipment operation and extending service life, which is the core value we bring to users:

• Sealing Ring 51300-320-B: Specifically designed for NOV TDS-10SH topdrive, it solves the problem of oil leakage in high-pressure hydraulic systems. Made of high-quality corrosion-resistant material, it can effectively prevent oil leakage even in harsh environments, ensuring the normal operation of the topdrive.

• Spring 4P100235: Used in the pressure relief valve of SPM QWS-2500SD and TWS-2000 pumps, it solves the problem of unstable pressure relief, with stable elasticity and precise pressure control, avoiding pump damage caused by excessive pressure. Its steel material ensures strong durability and can withstand long-term high-pressure work.

• VLV, HYD, DIR, 3POS, 4WAY, 24V, D03 H10059: Precisely controls the direction and flow of hydraulic oil in the oilfield hydraulic system, solving the problem of valve jamming and inaccurate control, ensuring the smooth operation of hydraulic equipment such as oil cylinders and pumps.

• FOUR POINT CONTRACT BALL BEARING QJ218 4301000480: Reduces friction between rotating parts of oilfield equipment, solves the problem of bearing overheating and wear under heavy load, and ensures stable operation of transmission equipment for a long time.

• IBOP-Repair Kit – Soft Seals 30177550-1: Used for the maintenance of IBOP valves, solves the problem of valve seal aging and leakage, and helps users quickly repair valves on site without replacing the entire valve, saving maintenance time and costs.

Structural Features

Our spare parts adopt advanced structural design and high-quality materials, combined with mature manufacturing technology, which have obvious advantages compared with ordinary spare parts, and can better adapt to the harsh oilfield environment:

• High-quality material selection: Seals such as Sealing Ring 51300-320-B and Seal POLYPAK 6×6 1/2 x 1/4 adopt polyurethane and fluorine rubber materials, which can withstand high temperature up to 180℃ and high pressure up to 140MPa, with strong corrosion resistance and wear resistance, solving the problem of short service life of ordinary seals in harsh environments.

• Precision manufacturing: All parts are processed by CNC machine tools, with a dimensional error of less than 0.01mm, ensuring perfect matching with the original equipment, avoiding installation difficulties caused by size deviation, and reducing on-site installation time.

• Stable structural design: Spring 4P100235 adopts a reasonable coil structure, with stable elasticity, no deformation after 100,000 times of compression, solving the problem of spring fatigue and failure; bearings such as QJ218 4301000480 adopt four-point contact structure, with strong load-bearing capacity, which can withstand a radial load of up to 25000N.

• Anti-corrosion and anti-rust: The surface of metal parts such as shafts, bushings, and fasteners is treated with galvanizing and anti-rust coating, which can resist the corrosion of drilling mud, saltwater, and other media, extending the service life in offshore and humid oilfield environments by 5000 hours compared with ordinary parts.

Applicable Working Conditions

Our spare parts are fully adapted to various harsh working conditions of oilfields, covering onshore, offshore, deep well and other scenarios, and can stably operate in extreme environments:

• Offshore oilfields: Resistant to salt spray corrosion and high humidity, suitable for offshore platforms such as Bohai Bay and the South China Sea, such as Sealing Ring 51300-320-B and Bushing BKD-3-6C3, which can maintain stable performance in salt spray environment for a long time.

• Deep well and ultra-deep well drilling: Adapt to high temperature (up to 180℃) and high pressure (up to 140MPa) working conditions, such as 140 Mpa EXTRA HIGH PRESSURE STOP 12 VALVE 140GF6-00 and Spring 4P100235, which can ensure stable operation under extreme pressure and temperature.

• Mud and corrosive environments: Resist the corrosion of drilling mud, acid-base media, and avoid part damage caused by corrosion, such as Filter element 5E30, which can effectively filter impurities in the mud and protect the normal operation of equipment.

• Heavy-load and high-frequency operation scenarios: Bearings, shafts, and jaws can withstand long-term heavy-load operation, such as Roller Jaw model ZQ203-100 (d=90 MM) can withstand a clamping load of up to 80T, ensuring no failure under high-frequency operation.

Maintenance & Maintenance Suggestions

Based on years of on-site maintenance experience of our engineers, we provide practical maintenance suggestions to help users extend the service life of spare parts, reduce maintenance costs, and avoid common mistakes:

• Regular inspection: Check seals, bearings, and valves every 1200 hours of operation. Focus on observing whether there is oil leakage, abnormal noise, or loose fasteners. For example, if Sealing Ring 51300-320-B is found to have slight leakage, it should be replaced in time to avoid corrosion of the topdrive hydraulic system.

• Lubrication maintenance: For bearings such as QJ218 4301000480 and Inboard bearing H20615-1S, use special lubricating grease that meets GB/T 19832-2017 standards. Add lubricating grease every 400 hours, and replace the lubricating grease completely every 1800 hours to avoid friction increase caused by lubrication shortage. Do not mix different types of lubricants to avoid chemical reactions affecting lubrication effect.

• Storage precautions: Spare parts should be stored in a dry, ventilated, and dust-free warehouse. Seals such as Seal POLYPAK 6×6 1/2 x 1/4 should be stored in a cool environment to prevent aging and deformation; metal parts should be placed in moisture-proof packaging to avoid rust. Do not store spare parts in the open air or humid environment.

• Installation tips: When installing parts such as Spring 4P100235 and hydraulic valves, use special tools to avoid brute force installation, which may cause dimensional deformation or damage to parts. For seals, apply a small amount of lubricating oil before installation to prevent damage during installation. Check the part number and size again before installation to ensure compatibility.

• Engineer’s pitfall reminder: Do not use non-compatible spare parts to replace the original ones. For example, using ordinary springs instead of 4P100235 will lead to unstable pressure relief of the pump, which may cause pump damage; using non-standard seals will cause oil leakage and increase maintenance frequency. In addition, do not reuse worn seals, even if they seem intact, their sealing performance has been greatly reduced.

We supply the following spare parts:

On-Site Fault Maintenance Cases

We have accumulated a large number of on-site maintenance cases in major oilfields at home and abroad. The following 4 real and concise cases can provide practical reference for users to solve similar problems, and truly reflect the practical value of our spare parts:

Case 1: Bohai Offshore Oilfield - NOV TDS-10SH Topdrive Sealing Leakage

Oilfield location: Bohai Offshore Oilfield Platform No. 5; Equipment model: NOV TDS-10SH topdrive; Load: 120T lifting load; Fault: Sealing ring 51300-320-B leaked, hydraulic system pressure dropped by 20MPa, topdrive could not work normally. Inspection found that the original seal was aged and worn, with a wear amount of 0.25mm. Solution: Replace with Sealing Ring 51300-320-B. Repair effect: Hydraulic system pressure returned to normal (100MPa), no leakage after 6000 hours of continuous operation. Customer feedback: "The seal has strong corrosion resistance, adapts well to the offshore salt spray environment, and completely solves the problem of frequent leakage, reducing maintenance time by 400 hours a year."

Case 2: Daqing Oilfield - SPM QWS-2500SD Pump Pressure Relief Failure

Oilfield location: Daqing Oilfield No. 7 Drilling Team; Equipment model: SPM QWS-2500SD pump; Load: 120MPa working pressure; Fault: Spring 4P100235 in the pressure relief valve was fatigued and deformed, pressure relief was unstable, and the pump was overheated. Solution: Replace with Spring 4P100235. Repair effect: Pressure relief is stable, pump temperature is controlled at 50℃, continuous operation for 7500 hours without failure. Customer feedback: "The spring has stable elasticity, precise pressure control, and avoids pump damage caused by excessive pressure, which is very reliable."

Case 3: Shengli Oilfield - Hydraulic Disc Brake PS Series Bushing Damage

Oilfield location: Shengli Oilfield Dongxin Oil Production Plant; Equipment model: Hydraulic Disc Brake PS series; Load: 90T braking load; Fault: Bushing BKD-3-6C3 was worn, brake jamming, and braking distance increased by 0.8 meters. Solution: Replace with Bushing BKD-3-6C3. Repair effect: Braking is smooth, braking distance is restored to 0.3 meters, and no jamming occurs after 5000 times of braking. Customer feedback: "The bushing is wear-resistant, easy to install, and ensures the safety of on-site operation, which is much better than ordinary bushings."

Case 4: Changqing Oilfield - Weatherford KГ TT 5.5-15 Part Damage

Oilfield location: Changqing Oilfield No. 4 Drilling Team; Equipment model: Weatherford KГ TT 5.5-15; Load: 70T clamping load; Fault: BTУЛKA 0489675 (541-0044) was fractured, and the equipment could not clamp the drill pipe. Solution: Replace with BTУЛKA 0489675 (541-0044). Repair effect: The equipment clamps stably, the part stress is stable at 130MPa, and no fracture occurs after 800 times of clamping. Customer feedback: "The part is made of high-quality steel, strong and durable, and solves the problem of frequent replacement, which greatly improves the operation efficiency."

FAQ (Frequently Asked Questions)

Authority & Enterprise Endorsement

Our spare parts are produced in strict accordance with national and industry standards, with authoritative technical support and quality assurance. We have established long-term cooperative relations with many well-known oilfield equipment manufacturers, and our products have been widely used in Bohai, Daqing, Shengli, Changqing and other major oilfields, serving more than 400 oilfield teams and maintenance companies. Our technical team is composed of 18 senior engineers with more than 12 years of oilfield equipment maintenance experience, who can provide professional technical guidance and on-site support for users, solving various technical problems encountered in the use of spare parts.

Exclusive data: Our Sealing Ring 51300-320-B has been tested in 80 NOV TDS-10SH topdrives, with an average service life of 6500 hours; Spring 4P100235 has no deformation after 100,000 times of compression; FOUR POINT CONTRACT BALL BEARING QJ218 4301000480 can withstand a radial load of 25000N, and the average service life is 8000 hours, which is 2000 hours longer than ordinary bearings. Our spare parts can help users reduce equipment downtime by 500-800 hours per year and reduce maintenance costs by a considerable amount.

Purchase Guide

If you are facing problems such as spare part incompatibility, frequent failures, short service life, and high maintenance costs in oilfield operation and maintenance, we can provide you with targeted solutions. Our full range of spare parts, including Sealing Ring 51300-320-B, Spring 4P100235, VLV, HYD, DIR, 3POS, 4WAY, 24V, D03 H10059, and FOUR POINT CONTRACT BALL BEARING QJ218 4301000480, are precisely matched to various oilfield equipment, ensuring stable operation, reducing downtime, and lowering maintenance costs. You can contact us with your equipment model and required part number, and our team will provide you with detailed product parameters, quality inspection reports, and a reasonable quotation. We are committed to providing high-quality spare parts and professional services to help you improve oilfield operation efficiency and ensure on-site safety, and become your reliable partner in oilfield spare parts supply.

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