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Hard seal gate valve

Features: Size: 2”~ 12”
Pressure Rating: PN1.0MPa, PN1.6MPa, 150LB
Material: Ductile Iron
Design Standard: DIN3352,MSS SP-70
Inspection Standard: DIN3230,API598
Application medium: water, oil, gas
Application Temperature: 0-120℃

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What is a hard seal gate valve？

A hard seal gate valve is a type of valve that uses a metal-to-metal seal between the gate and the valve seat to provide a tight shut-off. This type of valve is typically used in high-pressure and high-temperature applications where a reliable and leak-free seal is critical. The gate in a hard seal gate valve is typically made of a hard-wearing material such as stainless steel or tungsten carbide, and the valve seat is made of a similarly hard material such as ceramic or stellite. When the valve is closed, the gate is forced against the seat, creating a tight seal that prevents any fluid from passing through the valve.

DN	L	d		C		x-n		T	f	g
50	178	165		125		4-18		19	2	99
65	190	185		145		4-18		19	2	118
80	203	200		160		4-18	8-18	19	3	132
100	229	220		180		8-18		19	3	156
125	254	250		210		8-18		19	3	184
150	267	285		240		8-23		19	3	211
200	292	340		295		8-23	12-23	21	3	266
250	330	395		350	355	12-23	12-25	22	3	319
300	355	445		400	410	12-23	12-25	25	4	370
350	381	515		460	470	16-23	16-25	25	4	430
400	405	580		515	525	16-26	16-31	28	4	475
450	432	650		565	585	20-26	20-31	29	5	530
500	457	670	715	620	650	20-26	20-34	29	5	580
600	508	780	810	725	770	20-30	20-36	38	5	680

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Standards&Features:

Advantages of hard seal gate valve:

1.High durability:

The metal-to-metal seal in hard seal gate valves makes them highly resistant to wear, erosion, and corrosion, providing a longer service life.

2.High temperature resistance:

Hard seal gate valves can withstand high temperatures and are therefore ideal for applications where high-temperature fluids are present.

3.Tight shut-off:

The metal-to-metal seal provides a tight shut-off, preventing any fluid from passing through the valve.

4.Low leakage:

The tight shut-off provided by hard seal gate valves results in low leakage rates, which is important for applications where leakage can be hazardous or costly.

5.Low maintenance:

Hard seal gate valves require minimal maintenance due to their durable construction and metal-to-metal seal, resulting in lower maintenance costs and reduced downtime.

6.Better performance:

Hard seal gate valves provide superior performance compared to soft-seated gate valves in high-pressure and high-temperature applications, making them suitable for a wide range of industrial applications.

The main differences between hard seal gate valves and soft seal gate valves are as follows:

1. Sealing mechanism:

Hard seal gate valves use a metal-to-metal seal between the gate and the valve seat, while soft seal gate valves use a soft material such as rubber or elastomer to create a seal between the gate and the valve seat.

2. Operating torque:

Hard seal gate valves require more operating torque compared to soft seal gate valves due to the metal-to-metal seal, which can result in longer closing times and increased wear on the valve components.

3. Leakage rate:

Hard seal gate valves provide a tighter shut-off compared to soft seal gate valves, resulting in lower leakage rates.

4. Temperature and pressure resistance:

Hard seal gate valves are better suited for high-temperature and high-pressure applications compared to soft seal gate valves, which may deform or fail under extreme conditions.

5. Maintenance requirements:

Hard seal gate valves require more maintenance compared to soft seal gate valves due to the metal-to-metal seal, which can wear over time and require replacement.

Overall, hard seal gate valves offer better durability, temperature, pressure resistance, and tighter shut-off than soft seal gate valves but require more maintenance and operating torque. Soft seal gate valves are generally less expensive and require less maintenance but may not be suitable for high-temperature or high-pressure applications. The choice between hard and soft seal gate valves depends on the application requirements and operating conditions.

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