Low Temperature Globe Valve

Name: Low Temperature Globe Valve
Availability: InStock
Rating: 5 (1 reviews)

Key Specifications / Features

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Detail Information

Low temperature globe valve is used for control system which stores low temperature liquid, having reliable sealing. Low temperature globe valve is also applicable for other low temperature medium.

Standards

Design: JB/T 7749-95

Length: GB/T 12221-89

Face to face: GB/T 9113-2000, HG 20592-97, SH 3406-96, GB/T 12224-89

Testing & inspection: JB/T 7749-95

Parameter

Model		DJ41Y-16	DJ41Y-16P	DJ41Y-25	DJ41Y-25P	DJ41Y-40	DJ41Y-40P
Working Pressure (MPa)		1.6		2.5		4.0
Applicable Temperature(℃)		-45		-101		-196
Applicable Medium		Gas, ethylene, propylene, etc
Materials	Body/bonnet	LCB	LC3	LCB	LC3	LCB	LC3
	Disc/base	Nickel chromium steel＋cobalt chromium tungsten
	stem	Nickel chromium steel

Dimensions

Nominal Diameter	Dimensions							H
Nominal Diameter	L	D	D1	D2	b	Z-d	D0	-46℃	-101℃	-196℃
DJ41Y-16C DJ41Y-16P DJ41Y-16R DJ641Y-16C DJ641Y-16P DJ641Y-16R DJ9B41Y-16C DJ9B41Y-16P DJ9B41Y-16R
50	230	160	125	100	16	4-18	240	460	480	520
65	290	180	145	120	18	4-18	280	475	505	525
80	310	195	160	135	20	8-18	280	520	550	590
100	350	215	180	155	20	8-18	320	545	575	615
125	400	245	210	185	22	8-18	360	590	620	660
150	480	280	240	210	24	8-23	400	650	650	730
200	600	335	295	265	26	12-23	400	850	850	930
250	730	405	355	320	30	12-25	450	956	986	1036
300	850	460	410	375	30	12-25	500	1095	1125	1175
DJ41Y-25 DJ41Y-25P DJ41Y-25R DJ641Y-25C DJ641Y-25P DJ641Y-25R DJ9B41Y-25C DJ9B41Y-25P DJ9B41Y-25R
50	230	160	125	100	20	4-18	240	460	480	520
65	290	180	145	120	22	8-18	280	475	505	525
80	310	195	160	135	22	8-18	280	520	550	590
100	350	230	190	160	24	8-23	320	545	575	615
125	400	270	220	188	28	8-25	360	590	620	660
150	480	300	250	218	30	8-25	400	650	680	730
200	600	360	310	278	34	12-25	400	850	880	930
250	730	425	370	332	36	12-30	450	956	986	1036
300	850	485	430	390	40	16-30	500	1095	1125	1175
DJ41Y-40 DJ41Y-40P DJ41Y-40R DJ641Y-40C DJ641Y-40P DJ641Y-40R DJ9B41Y-40C DJ9B41Y-40P DJ9B41Y-40R
50	230	160	125	100	20	-	240	483	504	546
65	290	180	145	120	22	-	280	499	530	551
80	310	195	160	135	22	-	280	546	578	620
100	350	230	190	160	24	-	320	572	604	646
125	400	270	220	188	28	-	360	620	61	693
150	480	300	250	218	30	-	400	683	741	767
200	600	360	320	282	38	-	400	893	924	977
250	730	425	385	345	42	-	450	1004	1035	1088
300	850	485	450	408	46	-	500	1150	1181	1234

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FAQs

What are Low Emission Valves?

Basic Concept

Low Emission Valves refer to valves that, through special design and manufacturing processes of the stem packing and mid-seat gasket, control the leakage of media (gases, liquids) to extremely low levels. They are primarily used in industrial scenarios with high safety and environmental protection requirements. The core objective is to reduce or prevent the leakage of harmful media (such as volatile organic compounds (VOCs), toxic gases, flammable and explosive substances, etc.) into the external environment. Therefore, low emission valves offer multiple advantages in terms of energy conservation, emission reduction, reduced safety risks, and environmental pollution.

Key Technical Standards and Leakage Grades

The performance of Low Emission Valves is quantified by their leakage rate, and different industries follow different standards. Common standards include:

1. International Standards

ISO 15848-1: This standard classifies valve leakage grades into four levels: A (the highest requirement), B, C, and D. Grade A requires a leakage rate of ≤100 ppm (by volume).

API 624 (American Petroleum Institute): This standard, applicable to the refining and chemical industries, specifies a leakage rate of ≤100 ppm (for gases) under specific pressures.

EPA Standard (U.S. Environmental Protection Agency): This standard, targeting VOC emissions, requires a leakage rate of ≤500 ppm.

2. Chinese Standards

GB/T 42223-2022: This standard, which references international standards, regulates the design, manufacturing, and testing of Low Emission Valves.

Traditional Valves vs. Low Emission Valves

Comparison Dimension	Traditional Valves	Low Emission Valves
Leakage Rate	Typically ≥1000 ppm (for gases)	≤100 ppm (some can reach ≤10 ppm)
Sealing Structure	Single seal (e.g., packing gland) with poor initial stability, susceptible to temperature changes and impact	Single seal (e.g., packing gland) with long-term extreme stability, unaffected by temperature changes and impact
Testing Requirements	Hydrostatic / Pneumatic tests	Helium leak detection (leakage rate ≤1×10⁻⁷ Pa・m³/s)
Cost	Lower	Slightly higher, but less than 1-2% more than traditional valves
Applicable Media	General industrial fluids	High-risk, high-value, and high environmental protection requirement media

Storage Performance Deficiencies of Traditional Valves

Traditional valves using ordinary graphite packing face dual storage risks.

1. Physical Adsorption Leading to Operational Failure

During long-term static storage, graphite molecules adhere to the valve stem surface due to van der Waals forces, forming a rigid adsorption layer. This increases the valve opening torque by 2-3 times compared to the initial value. In extreme cases, it may cause the actuator to overload and fail.

2. Chemical Corrosion Leading to Seal Degradation

Ordinary graphite packing typically has a sulfur content of ≥1200 ppm (by mass). In storage environments with humidity ≥60%, sulfur reacts with the metal valve stem through electrochemical corrosion, forming a FeS corrosion layer. This enlarges the seal interface gap, causing the leakage rate to increase exponentially over time, with an average annual leakage increase of 30%-50%.

Storage Performance Advantages of Low Emission Valves

Low Emission Valves achieve a breakthrough in storage stability through the following means:

1. Upgraded Material System

Sealing Packing: High-purity sulfur-free graphite (sulfur content ≤0.01%) with ≥99.5% purity is used. The interlayer bonding is enhanced through nano-scale flake orientation technology, blocking the migration path of sulfur elements.

Mid-flange Gasket: Modified flexible graphite composite material with 15%-20% nickel-based alloy reinforcement is used to form a corrosion-resistant skeletal structure.

2. Performance Verification Data

Traditional Valves: Opening torque increases from 80 N•m to 220 N•m, and leakage rate rises from 500 ppm to 2800 ppm.

Low Emission Valves: Opening torque fluctuation is ≤±5%, and leakage rate remains below 20 ppm, fully meeting the stringent long-term storage performance requirements of API 624.

How We Manufacture 100% Low Emission Valves?

At first, manufacturing low emission valves was pretty much the same for us as it was for other regular valve manufacturers in China. If we ran into problems like valves not passing tests or having leak rates that kept changing, we'd just try to get better packing materials from a different supplier. We didn't really stop to think about the bigger picture, like how the whole manufacturing process or the properties of the materials we were using might be causing the issues.

Over time, we figured out that the metal parts of the valves were pretty reliable, but we hadn't been paying enough attention to the non-metal parts that actually do the sealing. And those parts are super important for making sure the valves don't leak. So, back in 2008, we decided to focus on manufacturing low emission valves from start to finish.

First, we created a special team just for figuring out better ways to seal valves. They dug deep into how to make the seals work really well and how to build them. At the same time, we started working closely between the people who design the seals and the people who manufacture the valves. By tweaking the design of the seals and how we put the valves together, we made a system where everything works together perfectly. After that, we tested a bunch of different valves to see how well they sealed in all kinds of situations: different sizes, pressures, and temperatures. All the data we collected from these tests helped us keep improving our valves.

Now, when we manufacture a bunch of valves and check them randomly, they all meet the tough standards of API 624 and ISO 15848-1. We've gone from just following a process to really understanding and controlling the technology ourselves.