The HEP electrical valve positioner is used in conjunction with the regulating valve, replacing the electrical signal output by the regulator with the pneumatic signal that drives the regulating valve. At the same time, position feedback is provided based on the opening of the regulating valve to ensure correct positioning. It is available in two forms: single and double acting.

Its characteristics are as follows:
1. The relay has a large capacity, low air consumption, good stability, and high sensitivity;
2. High precision of electromagnetic components;
3. Adjustment and maintenance can be carried out directly in working condition;
4. The magnet is made of high energy storage rare earth materials, and the current is input through elastic elements without the need for leads.

Technical parameters and performance:
Input signal standard 4-20mADC,
Split range 4-12mADC, 12-20mADC
10-50mADC (HEP-15,17; HEP-25,27)
Input impedance 250 Ω (4-20mADC) 100 Ω (10-50mADC)
The gas supply pressure is shown in Table 1
Rated stroke straight stroke 12-100mm, corner 0-90
Wire connector M22 × 1.5 internal thread
Air source connector Rc1/4
Environmental temperature explosion-proof type -20~+60 ℃
Ordinary type -40~+80 ℃
Relative humidity ≤ 90%
Performance input characteristics: linear, equal percentage, fast opening (see figure)
Linear ± 1% gas consumption is shown in Table 1
Return difference of 1% flow is shown in Table 1
Dead zone 0.4% weight as shown in Table 1