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

The core components of a 304 316 stainless steel gate valve include the body, bonnet, gate, stem, packing, handwheel, and threaded ends. The body and bonnet are made from stainless steel CF8 (304) or CF8M (316L), containing pressure and forming the flow path. The gate, also CF8 or CF8M, moves up/down to block/allow flow. The stem (304 or 316 stainless) transmits torque. The packing is PTFE, sealing the stem-bonnet gap. The handwheel is aluminum. Connection threads conform to G, NPT, BSPT, or DIN259 standards. This stainless steel gate valve pn16 series covers 1/2" (DN15) to 2" (DN50) sizes for small-bore piping. Nominal pressures are 1.6MPa and 2.5MPa; exceeding these ratings is prohibited. Applicable media include water and oil.

Product Application

The stainless steel threaded gate valve (screwed-end type) is a linear-motion valve for isolating/connecting pipeline media. The 304 316 stainless steel gate valve offers corrosion resistance, making it widely suitable for water, oil, gas, and mildly corrosive liquid systems, especially in DN15 to DN50 lines. It is a fundamental device for flow isolation in municipal, chemical, and construction industries.

Technical Parameters

Model	Nominal Pressure (MPa)	Shell Test Pressure (MPa)	Seal Test Pressure (MPa)	Applicable Medium	Medium Temp. (°C)
Z15W	1.0	1.5	1.1	Water & Weakly Corrosive Fluids	0~80℃
Z15W	1.6	2.4	1.76	Water & Weakly Corrosive Fluids	0~80℃

Installation & Maintenance

1. Pre-Installation Check

Verify model, size, pressure rating (e.g., Z15W-16P DN25 = 1.6MPa, 304 SS, DN25). Inspect for cracks, porosity, damaged threads, and ensure handwheel turns smoothly. Check that packing is tight and undamaged, and the gate operates fully.

3. Routine Maintenance (Weekly)

Clean exterior; check threads for corrosion. Operate handwheel 1-2 turns to confirm smooth action. For minor packing leaks, evenly tighten the gland nut in 1/4-turn increments.

2. Correct Installation

This 2 inch stainless steel gate valve has no flow direction restriction. Install with handwheel upward or horizontal to avoid debris accumulation. Hand-tighten into pipe threads first, then secure with a pipe wrench. Torque should not exceed 30 N·m for DN15-DN25 and 50 N·m for DN32-DN50 to avoid thread stripping. For high-temperature service, install expansion joints. For vibrating pipes, use supports.

4. Periodic Maintenance

To replace packing, isolate and depressurize the stainless steel gate valve pn16, remove the gland nut, extract old packing, and install new PTFE packing in layers (use graphite for high temp). For seal maintenance, open valve, wipe gate/seat with a soft cloth, apply suitable grease (food-grade for water, silicone-based for oil/gas). Maintain threads by cleaning and applying compatible anti-rust oil in humid or idle conditions.

Troubleshooting

Symptom

Possible Causes

Corrective Action

Thread Connection Leak

1. Insufficient sealant/tape;

2. Thread damage;

3. Loose connection.

1. Disassemble, reapply sealant;

2. Repair or replace fitting;

3. Tighten to specified torque.

Packing Leak

1. Packing aged/worn;

2. Loose gland;

3. Worn stem.

1. Replace packing;

2. Tighten gland nut evenly;

3. Repair or replace stem.

Valve Seized

1. Debris jamming gate;

2. Stem corrosion;

3. Sealing surfaces stuck.

1. Tap body lightly, try operating slowly;

2. Disassemble, apply penetrant;

3. Partially open to flush surfaces.

Stiff Operation

1. Lack of lubrication;

2. Bent stem;

3. Loose handwheel..

1. Apply suitable grease;

2. Replace stem;

3. Tighten handwheel nut.

Seat Leakage

1. Scratched sealing surfaces;

2. Deformed gate;

3. Contaminants on seat.

1. Lap/polish surfaces;

2. Replace gate;

3. Flush valve to clear debris.

FAQ

Q: What does the 'PN16' rating signify for a stainless steel gate valve pn16?

A: PN16 indicates a Pressure Nominal rating of 16 bar (approximately 1.6 MPa or 232 psi) at a reference temperature (usually 20°C for water). It defines the maximum continuous working pressure the valve is designed to withstand.

Q: What is the key difference between a 304 316 stainless steel gate valve in terms of material choice?

A: Type 304 (CF8) offers good general corrosion resistance. Type 316/316L (CF8M) contains molybdenum, providing significantly better resistance to chlorides and acids, making it the preferred choice for coastal environments, chemical processing, or where mild acids are present.

Q: Can a 2 inch stainless steel gate valve with threaded ends be used in a welded pipeline system?

A: Direct welding is not recommended for a standard threaded-end valve, as heat can damage seals and warp components. For welded systems, use a 2 inch stainless steel gate valve specifically designed with butt-weld ends. Alternatively, use threaded-to-weld adapters, welding them to the pipe first and then screwing in the valve.

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