... structure high frequency welding machine. professional welding tents, air domes, banners, truckcovers. Tensile membranes high frequency welding machine ... PVC, fabric, tarpaulin products, blow air toys, umbrellas, banners, raincoat, bath shade, air bed, oil bag, swimming ring, ... 8T85RB / E3130 Anti-spark thyratron tube: NL5557 Pressure way air pressure gap of electrodes: 250mm / 150mm / 150mm upper ...