Valve Limited Switch
Key Specifications / Features
Detail Information
-Solid and compact design.
Aluminium die-casting housing and powder coating.
-Bolts on visual position indicator.
-Quick-set” cam
Spring loaded splined cam.
No need to adjust again after initial setting.
Easy setting without tool.
-Dual cable entries.
2 x 1/2 NPT(Standard ) M20,PG13.5,PF1/2”,PT1/2".(Option).
-Captive cover bolts.
worry to loose bolts while cover open.
-Easy mounting bracket.
NAMUR standard stainless steel shaft and bracket.
| SPECIFICATION | STANDARD | OPTION | MATERIAL | |
| Enclosure | Weatherproof IP67/NEo MA4&4X | IP 68 | Housing cover&body | Aluminium die casting |
| Ambient temperature | -20 ℃ ~ 80 ℃ | |
Shaft | Stainless steel |
| Indicator cover | Polycarbonate | |||
| Conduit entries | Two NPT1/2” | Two PF1/2”,PT1/2” M20,PG13.5 | Indicator | ABS/Polycarbonate |
| Terminal Strips | 8 points (0.08-2.5mm²) | Cam | Polycarbonate | |
| Position indicator | 0° ~ 90° (90° turn free join) close:red open:yellow |
0 ~ 90° close:red open:green |
Spring | Stainless steel |
| Housing cover bolt | Stainless steel | |||
| Switches | Mechanical switch x2 proximity sensor x2 |
O -ring | NBR | |
| Bushing | Bronze | |||
| External coating |
Polyester podwer coating(black) |
Nylon others on request red,green,blue, yellow,silver, |
E-ring(shaft) | Stainless steel |
| Earth lug | Stainless steel | |||
| Shaft | Standard shaft(83mm/16mm) | Option shaft(FREE) | Bracket | Stainless steel |
Position indicator  Re-adjustment available upon required direction |
Conduit entries  Cable entry due to length and thickness |
||
 |
90° Closed or Open for rotary application 90°Open or Closed for rotary application 45° Open or Closed for linear application |
Captive cover bolts  cover bolts are specially designed to prevent loosing it during maintenance or installation. |
|
| Switch Specifition | |
| Mechanical switch (2SPDT) APL-210N | Proximity sensor APL-220N |
-APL-210N-263x189.webp) |
 |
| Standard switch : SS5GL(Omron) 2SPDT switches (option: spst-nc, spst-no) Contact arrangement: 250V AC/3A, 125V AC/5A 250VDC/0.2A , 125VDC/0.4A, 30VDC/4A, Optional switch: SS10GL(Omron) 2SPDT switches (option: spst-nc, spst-no) Contact arrangement: 250V AC/10.1A, 125V AC/10.1A 250VDC/0.2A , 125VDC/0.4A, 30VDC/4A, Approved standards:UL,CSA,SEMKO,SEV EN61058-1 |
Standard sensor : NJ2-V3-N (P&F) Inductive proximity sensor (intrinsically safe) Voltage range: 8V DC ( IP67 to IEC 60529) Operating distance: 2mm Optional sensor EMC to EN60947-5-2 NBB2-V3-E2/E3(PNP): 10 - 30V DC Operating distance: 2mm NBB2-V3-E0 (NPN): 10 - 30V DC Operating distance: 2mm NBB3-V3-Z4/Z5: 5 - 60V DC Operating distance: 3mm |
| Bracket ( NAMUR Standard ) | Model No | Material | Application |
 |
MBP-100 | Stainless steel | 30x80 h20 |
| MBP-200 | Stainless steel | 30x80 h30 | |
| MBP-300 | Stainless steel | 30x130 h30 | |
| MBP-400 | Stainless steel | 30x130 h50 |
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FAQs
Modern valve packing systems use advanced engineered materials designed for durability, chemical resistance, and low friction performance. The most widely used material is flexible graphite, which offers excellent thermal stability (often up to 450–600°C in oxidizing environments and higher in non-oxidizing conditions).
To enhance strength and extrusion resistance, graphite packing is often reinforced with materials such as:
Inconel wire mesh reinforcement for high-pressure applications
Carbon fiber or aramid fiber layers for mechanical stability
PTFE-based components for chemical resistance in corrosive media
In some specialized applications, hybrid packing structures are used, combining multiple layers to balance sealing performance, friction control, and wear resistance.
Our valves are designed and manufactured in accordance with international standards such as API, ISO, DIN, EN, BS, JIS, and GOST. We can also customize products based on client specifications.
Valve stem packing is a critical sealing component installed around the valve stem inside the bonnet area. Its primary function is to prevent internal media (gas or liquid) from leaking to the external environment while still allowing smooth linear or rotary movement of the stem.
In industrial applications such as oil & gas, petrochemical, and power generation, packing acts as a dynamic seal that must withstand continuous friction, pressure fluctuations, and thermal cycling. Unlike static seals, packing is constantly in contact with a moving component, making material selection and compression design extremely important.
High-performance packing systems are often designed to meet low-emission requirements such as API 622 and ISO 15848-1, ensuring fugitive emissions remain within strict environmental limits.
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