Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of brass globe valve in China. If you're going to buy wholesale customized brass globe valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

The brass globe valve (hereinafter referred to as the globe valve) is one of the most widely used valves. The globe valve is closed by rotating the handwheel clockwise to lower the valve disc until fully closed; it is opened by rotating the handwheel counterclockwise to raise the valve disc until fully open. This reliable design is consistent across various sizes, from a compact 2 inch brass globe valve to larger industrial diameters.

The sealing principle of the globe valve relies on the pressure of the valve stem to tightly press the valve disc sealing face against the valve seat sealing face, preventing medium flow. The friction between sealing faces during opening and closing is small, making it relatively durable. It has a small opening height and is easy to maintain. This durability is a key feature, whether for a 4 inch brass globe valve in a main supply line or smaller residential valves.

Technical Parameters

Nominal Diameter: DN15-DN100. Common sizes include the 3 4 brass globe valve for residential plumbing branches.
Nominal Pressure: PN10, PN16
Operating Temperature: 0～80℃
Applicable Medium: Water

Product Application

Suitable for domestic water supply, water supply and drainage systems, wastewater treatment systems, HVAC systems, etc. In smaller diameter applications, such as with a 3 4 brass globe valve, it provides reliable shut-off. For larger flow requirements, a 2 inch brass globe valve or a 4 inch brass globe valve is commonly employed in main branch lines and industrial applications.

Product Features

1. The opening height is generally much smaller than that of a gate valve, resulting in a short working stroke and fast opening/closing time.

2. Compact size, simple structure, and relatively easy maintenance.

3. Due to low friction between the valve disc and the valve body sealing face during opening and closing, it is wear-resistant and has a long service life. This is true for models ranging from a 2 inch brass globe valve to larger diameters like the 4 inch brass globe valve.

Installation and Operating Precautions

Pre-installation Preparation

Check if the valve model, specifications, nominal pressure, and material match the working conditions (medium, temperature, pressure must meet design requirements).
Remove debris inside the valve body and stains on the sealing faces. Inspect the valve disc and seat sealing faces for integrity, ensuring no scratches or corrosion.
Check if the valve stem rotates smoothly, the handwheel is not loose, and the stuffing box seal is intact.

Installation Operation Standards

Flow Direction Requirement

Install strictly according to the "arrow" direction marked on the valve body (medium flows in from below the disc and out from above). Reverse installation is prohibited (as it will cause seal failure and difficult operation).

Installation Location

Preferably install in a location convenient for operation and maintenance. The handwheel height should ideally be 1.2-1.5m from the ground. If high-altitude installation is required, an operation platform must be provided.

Connection Method

Threaded Connection: Pipeline threads must match the valve ports. When applying thread seal tape or sealant, avoid entry into the valve interior. Tighten with moderate force to prevent thread damage.

Avoid Stress Installation

Eliminate transverse and longitudinal pipeline stresses (e.g., from thermal expansion/contraction) during installation. This can be achieved by installing compensators or flexible joints to prevent seal face leakage due to stress on the valve body.

Start-up Operation

Slow Opening

When opening, first rotate the handwheel 1-2 turns to observe for pipeline leaks, then gradually open fully (avoid sudden opening/closing) to prevent medium impact damage to the disc sealing face.

Venting/Draining

For gas pipelines, drain accumulated liquid before opening. For liquid pipelines, vent air to prevent water hammer or air locks.

Operation Monitoring

Within 30 minutes after start-up, regularly check the valve sealing faces and stuffing box for leaks, ensure the valve stem temperature is normal, and there is no abnormal vibration or noise.

Daily Operation Requirements

Operation

Apply force evenly and steadily when operating the handwheel. The use of levers or wrenches to extend leverage is prohibited (to avoid valve stem bending or handwheel breakage).

Status Identification

Mark the "fully open" or "fully closed" status on the handwheel after operation to prevent misoperation.

Prohibited Use

Should not be used as a throttle valve for extended periods (prolonged partial opening leads to erosion/wear of sealing faces, shortening service life). It is only for isolating/connecting the medium.

Maintenance and Care Specifications

Daily Maintenance (Daily/Weekly)

Visual Inspection

Check the valve body and connection points for leaks; inspect the handwheel and valve stem for damage or corrosion.

Operational Check

Rotate the handwheel to check valve stem flexibility for sticking or abnormal noise.

Cleaning

Remove dust and oil stains from the valve surface to keep it clean.

Regular Maintenance (Monthly/Quarterly)

Sealing Face Check

After closing the valve, check for leaks at the disc and seat sealing faces. For minor leaks, tighten the stuffing box gland appropriately (moderate force to avoid stem sticking).

Stuffing Box Maintenance

If the stuffing box shows seepage, tighten the gland bolts evenly clockwise. If seepage is severe, dismantle the gland and replace the packing (material must match the medium and temperature). Ensure packing is filled evenly and compacted during replacement to avoid gaps.

Valve Stem Lubrication

After cleaning the stem surface, apply appropriate lubricant (compatible with the medium and temperature-resistant) to reduce friction between the stem and packing, preventing corrosion and sticking.

Connection Point Inspection

Check bolts/nuts at threaded or flanged connections for looseness. Tighten promptly if loose to prevent leakage from vibration.

Annual Maintenance (Yearly)

Comprehensive Disassembly Inspection

Remove the valve from the pipeline. Fully disassemble components (body, disc, seat, stem, stuffing box). Clean corrosion, scale, and medium residue from all parts.

Sealing Face Repair

If the disc or seat sealing faces have minor scratches or wear, manual lapping with lapping paste can be performed for repair. If wear is severe (scratch depth > 0.1mm), replace the disc or seat assembly.

Component Replacement

Inspect wear on the stem, handwheel, gland, etc. Replace same-specification parts if the stem is bent/threads damaged, handwheel cracked, or gland deformed.

Assembly and Testing

Assemble the valve in reverse order of disassembly. Ensure all parts are properly installed with uniform clearance. After assembly, rotate the handwheel to check opening/closing smoothness for any sticking.

Pressure Test

After assembly, perform a hydraulic or pneumatic pressure test (test pressure is 1.5 times the nominal pressure). Hold for 15 seconds. The valve is qualified if no leakage is detected at sealing faces and connection points.

Common Faults and Solutions

Common Fault

Causes

Solutions

Internal Leakage (Medium seepage after closing)

1. Wear, scratches, or debris on the disc sealing face.

2. Bent valve stem causing poor sealing contact.

3. Loose or damaged valve seat.

1. Dismantle the valve, lap the disc and seat sealing faces; replace disc or seat if severely worn.

2. Straighten or replace the bent valve stem.

3. Tighten the seat fastening bolts; replace the seat if damaged.

External Leakage (Seepage at stem/gland or body flange connections)

1. Insufficient packing in stuffing box, loose gland, or incorrect packing type.

2. Aged/damaged flange gasket or misalignment during installation.

3. Casting defects (sand holes, porosity) in valve body or uneven flange bolt tightening.

1. Add or replace with suitable packing. Tighten gland bolts evenly to ensure packing tightly wraps the stem.

2. Replace the sealing gasket. Re-align flange faces. Tighten bolts evenly in a diagonal sequence.

3. Minor casting defects can be repaired with brazing; replace the valve body if severe.

Stiff or Difficult Valve Stem Operation

1. Insufficient lubrication between stem and packing, or overly tight gland.

2. Stem corrosion, wear, or damaged stem threads.

3. Disc sticking to seat (e.g., from crystallized medium or debris).

4. Internal scaling hindering disc movement.

1. Loosen gland bolts, add lubricant, adjust gland tightness.

2. For minor corrosion, polish and apply anti-rust oil. Replace stem if wear or thread damage is severe.

3. Dismantle valve, remove crystalline deposits or debris between disc and seat; lap sealing faces if necessary.

4. Clean valve interior with descaling agent; improve medium filtration.

Valve Fails to Fully Close or Open

1. Insufficient stem travel (e.g., worn stem threads, damaged travel stop).

2. Disc jammed by debris or deformed.

3. Bent stem causing disc misalignment.

4. Damaged operating mechanism (e.g., handwheel), unable to transmit torque.

1. Check stem threads and travel stop. Repair/replace damaged parts. Adjust stem travel to specified position.

2. Dismantle and clean debris. Replace disc if severely deformed.

3. Straighten or replace the valve stem.

4. Repair or replace operating mechanism parts (handwheel, stem nut, etc.).

Valve Body Cracking/Damage

1. Sudden medium temperature changes causing uneven thermal expansion/contraction.

2. Operating pressure exceeds valve rating.

3. Uneven stress during installation.

4. Material fatigue or casting defects.

1. Stop use immediately and replace valve body. For critical applications, check if system pressure/temperature exceeds limits.

2. Ensure operating pressure/temperature are within rated range. Install a pressure reducing valve if overpressure occurs.

3. Re-adjust pipeline/flange installation to eliminate stress.

4. Replace valve body with material suitable for the working conditions. For common sizes like the 3 4 brass globe valve, ensure replacements match original specifications.

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