Vee Packing Chevron Seal Set High Pressure Hydraulic Reciprocating V Packing for Cylinder Piston Rod

1. Product Advantages

• Super High Pressure Resistance: Adopts multi-ring stacked sealing structure, stably withstands working pressure up to 700bar, and customized PEEK/PTFE combinations support ultra-high pressure working conditions up to 1400bar, far exceeding the pressure limit of O-rings and common rod seals.

• Self-energizing Sealing Performance: Features dynamic self-tightening function. The higher the medium pressure, the tighter the sealing lips fit the contact surface, realizing zero leakage under high pressure and avoiding oil and gas leakage effectively.

• Excellent Wear & Aging Resistance: Optional fabric-reinforced rubber structure enhances anti-extrusion and tear resistance. It has 3-5 times longer service life than traditional seals, adapting to long-term frequent reciprocating operation.

• Adjustable & Easy Maintenance: The sealing tightness can be adjusted by tightening the gland. Slight wear will not cause failure, and the sealing performance can be restored without replacing the whole set, greatly reducing later maintenance cost and downtime.

• Strong Adaptability: Tolerates shaft eccentricity and minor installation deviation, runs stably at low and medium speeds, and matches various hydraulic media such as hydraulic oil, lubricating oil, water and glycol.

• Wide Temperature Compatibility: Multiple material options cover low temperature -45°C to high temperature 260°C, meeting the working requirements of extreme cold and high-temperature industrial environments.

2. Working Principle

Vee Packing is a typical self-energizing combined seal, composed of a male backup adapter, multiple V-shaped sealing rings and a female pressure adapter.

During equipment operation, the initial pre-tightening force provided by the upper and lower adapters makes the V-shaped rings closely fit the piston rod and cylinder wall to form basic static sealing. When the hydraulic or pneumatic medium generates working pressure, the pressure acts on the inner cavity of each V-shaped ring, pushing the sealing lips to expand outward and cling to the friction surface tightly. The higher the system pressure, the greater the radial sealing force.

In addition, the stacked multi-ring structure forms a multi-stage pressure reduction barrier. The medium pressure is gradually consumed and reduced through each sealing ring, which effectively blocks the leakage channel and finally achieves near-zero dynamic leakage. This unique working principle enables Vee Packing to maintain stable and reliable sealing performance under long-term high-pressure reciprocating motion.

3. Product Details

• Product Name: Vee Packing, V-Packing, Chevron Packing, V-Stack Seal

• Standard Structure: Male Adapter + Multiple V-Rings + Female Adapter (3/4/5/7 pieces V-rings optional for different pressure levels)

• Available Materials: NBR, HNBR, FKM/Viton, Fabric-reinforced NBR/FKM, PTFE, PEEK

• Pressure Range: Conventional fabric type ≤700bar; PTFE/PEEK composite type ≤1400bar

• Temperature Range: -45°C ~ 260°C (varies by material)

• Max Working Speed: ≤0.5m/s (rubber type); ≤1.0m/s (fabric reinforced type)

• Size Standard: Complete metric and imperial sizes, customized non-standard sizes acceptable

• Sealing Type: Reciprocating dynamic seal (suitable for single-acting and double-acting hydraulic systems)

• Core Features: Anti-extrusion, wear-resistant, high pressure resistant, adjustable tightness, low leakage, long service life

4. Application Range

Vee Packing is widely applied in heavy-duty industrial equipment that requires high pressure resistance and long-term stable reciprocating sealing, covering multiple industries worldwide:

• Construction Machinery: Excavators, loaders, cranes, bulldozers hydraulic cylinders and piston rods

• Industrial Hydraulic Equipment: Hydraulic presses, punching machines, injection molding machines, die-casting machines and high-pressure pump stations

• Metallurgy & Forging: Rolling mills, forging hydraulic cylinders and high-temperature and high-pressure hydraulic systems

• Oil & Gas Industry: Wellhead valves, fracturing pumps, downhole hydraulic tools and high-pressure pipeline equipment

• Marine & Offshore: Marine steering gears, deck machinery, offshore hydraulic cylinders (salt water corrosion resistant)

• Mining Machinery: Underground hydraulic supports, mining pumping equipment and heavy load reciprocating devices

5. FAQ

Q1: What is the difference between Vee Packing and ordinary O-rings?

A1: Vee Packing is a modular multi-stage high-pressure seal, while O-rings are single-function basic seals. Vee Packing can withstand up to 700bar ultra-high pressure (much higher than 200bar limit of O-rings), with adjustable tightness and longer service life. It is specially used for heavy-duty high-pressure scenarios where O-rings are easy to deform and leak.

Q2: How to choose the number of V-shaped rings?

A2: The number of V-rings depends on working pressure: 3 pieces for pressure below 100bar, 4-5 pieces for 100-400bar, and 5-7 pieces for pressure above 400bar. We can provide targeted matching solutions according to your working conditions.

Q3: Can Vee Packing be used after slight wear?

A3: Yes. Different from disposable seals, Vee Packing allows tightness adjustment. You only need to properly tighten the gland to compensate for wear clearance and restore the sealing effect, which greatly saves replacement costs.

Q4: Which material should I choose for my working condition?

A4: NBR for conventional oil medium and normal temperature; HNBR for high temperature and aging-resistant scenarios; FKM for chemical and solvent environments; fabric-reinforced rubber for standard high pressure; PTFE/PEEK for ultra-high pressure and strong corrosion working conditions.

Q5: Do you support customized sizes and logos?

A5: Yes. We support full customization of non-standard sizes, material formulas and product logos. Both small batch customization and large batch wholesale are acceptable, with fast delivery and stable quality.